Tag Archives: environment

Smart Plants: A Q&A with Jonathan Vaught, CEO and Co-Founder of Front Range Biosciences

By Aaron Green
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Plant genetics are an important consideration for cultivators planning to grow cannabis crops. Genetics can affect how well a plant grows in a particular environment under various conditions and have a major impact on the production of cannabinoids, terpenes as well as other molecules and traits expressed by the plant.

Front Range Biosciences is a hemp and cannabis genetics platform company, leveraging proprietary next generation breeding and Clean Stock® tissue culture nursery technologies to develop new varieties for a broad range of product applications in the hemp and cannabis industries. FRB has global reach through facilities in Colorado, California and Wisconsin, and a partnership with the Center for Research in Agricultural Genomics in Barcelona, Spain. FRB is headquartered in Lafayette, Colorado.

We spoke with Jonathan Vaught, Ph.D., CEO and co-founder of Front Range Biosciences. Jonathan co-founded Front Range in 2015 after a successful career in the diagnostics and food testing industries.

Aaron Green: Jon, thank you for taking the time today. I saw in the news you recently sent tissue cultures to the International Space Station? I’d love to learn more about that!

Hemp tissue culture samples like these sat in an incubator aboard the ISS

Jonathan Vaught: This was a collaborative project between the BioServe group at the University of Colorado Boulder, which is a part of their aerospace engineering program. They do research on the International Space Station, and they have for quite some time. We partnered with them and another company, Space Technology Holdings, a group that’s working on applications of space travel and space research. We teamed up to send tissue culture samples to the space station and let them sit in zero gravity at the space station for about a month, and then go through the reentry process and come back to Earth. We brought them back in the lab to perform some genomic analyses and try to understand if there’s any underlying genetic changes in terms of the plants being in that environment. We wanted to know if there was anything interesting that we could learn by putting these plant stem cells and tissue cultures in an extreme environment to look for stress response, and some other possible changes that might occur to the plants by going through those conditions.

Aaron: That’s an interesting project! Are there any trends that you’re following in the industry?

Jon: We’re excited to see ongoing legalization efforts around the world. We’ve seen continued progress here in the United States. We still have a long way to go, but we’re excited to see the additional markets coming onboard and regulations moving in the right direction. Also, we’re excited to see some of the restorative justice programs that have come out.

Aaron: How did you get involved at Front Range Biosciences?

Jon: It really starts with my background and what I was doing before Front Range Biosciences. I’ve spent more than 15 years developing commercializing technologies in human diagnostics, food safety and now agriculture.

Jonathan Vaught, Ph.D., CEO and co-founder of Front Range Biosciences

I started my career during graduate school in biotech at the University of Colorado at Boulder, where I helped develop some of the core technology for a human diagnostic startup company called Somalogic here in Colorado. I went to work for them after finishing my dissertation work and spent about six years there helping them grow that company. We ended up building the world’s largest protein biomarker discovery platform primarily serving pharmaceutical companies, hospitals and doctors, with personalized medicine and lab tests for things like early detection of chronic illness, cancer, heart disease and inflammation.

I then went to another startup company called Beacon Biotech, that was interested in food safety. There I helped develop some similar technologies for detecting food-borne illness — things like salmonella, listeria and E. coli. That was my introduction to big food and big agriculture. From there, I went to help start another company called Velocity Science that was also in the human diagnostic space.

Along the way, I started a 501(c)3 nonprofit called Mountain Flower Goat Dairy, a dairy and educational non-profit that had a community milk-share, which included summer camps and workshops for people to learn about local and sustainable agriculture. I became more and more interested in agriculture and decided to take my career in that path and that’s really what set me up to start Front Range Biosciences.

Aaron: Do you have any co-founders?

Jon: I have two other co-founders. They both played various roles over the last four years. One was another scientist, Chris Zalewski, PhD. He currently works in the R&D department and helps oversee several different parts of the company including pathology and product development. My other co-founder, Nick Hofmeister served as chief strategic officer for the last few years, and has helped raise the majority of our funding. We’ve raised over $45 million dollars, and he played a big role in that.

Aaron: What makes you different from other cannabis seed companies?

John: We’ve built the first true cannabis genetics platform. What I mean by that is we built a platform that allows us to develop and produce new plant varieties that support both the hemp and the cannabis markets. To us, it’s all cannabis. Hemp and cannabis are scientifically the same plant. They just have different regulatory environments, different products and different markets, but we stay focused on the plant. Our platform is built on several different pillars. Genetics are one of the core pieces, and by genetics I mean, everything from molecular based breeding to marker assisted breeding to large germplasm collections. We collect different varieties of germplasm, or seed, from all over the world and use those to mix and match and breed for specific traits. We also have large nursery programs. Another one of our pillars of the platform includes greenhouse nursery production — everything from flowering cannabis plants to producing cannabis seeds to cloning and producing mother plants and rooted cuttings or clones.

Then tissue culture is another part of the platform, it’s basically the laboratory version of a greenhouse nursery. It’s housed in a sterile environment and allows us to produce plants that are clean and healthy. It’s a much more effective, modern way to manage the nursery. It’s part of our clean stock program, where we start clean, stay clean, and you can finish clean. It’s really built on all of those different pieces.

We also have capabilities in analytical chemistry and pathology, that allow us to better understand what drives performance and the plants, and both different regions as well as different cannabinoid products or terpene products. All of the science and capabilities of the platform are what allow us to create new varieties faster, better, stronger.

Aaron: It sounds like you’re vertically integrated on the front-end of cannabis cultivation.

Jon: Absolutely, that’s a great way to think about it.

The last piece I’d say is that we have areas of research and development that cover the full span of multiple product lines. We think about it from an ingredient perspective. Cannabinoids and terpenes are certainly what drive a large part of the cannabis market in terms of edibles, smokable flower, vapes and extracts and the different effects and flavors that you get. We also are looking at other ingredients, like plant-based protein and hemp as a viable protein source and the ability for hemp to produce valuable fiber for textiles, as well as industrial building materials and applications.

Lastly, there are additional small molecules that we’re working on as well from a food ingredients perspective. There are all kinds of interesting compounds. Everybody talks about the cannabinoids and terpenes, but there are also things like flavonoids, and some other very interesting chemistries that we’re working on as well.

Aaron: What geographies are you currently in?

Jon: Colorado and California primarily and we have a small R&D partnership in Barcelona.

Hemp clones and seeds is a big part of the Front Range Biosciences business

Aaron: Do you have plans for expansion beyond that?

Jon: Our current headquarters are out of Colorado, and most of our Colorado operations right now are all hemp. Our hemp business is national and international.

We work with a licensed cannabis nursery partner in California which is our primary focus for that market, but we will be expanding the cannabis genetics and nursery program into Colorado next year. From a regulated cannabis perspective, that’s the first move. Beyond that, we’re in conversations with some of the multi-state operators and cannabis brands that are emerging to talk about how to leverage our technology and our genetics platform across some of the other markets.

Aaron: How do you think about genetics in your products?

Jon: Genetics means a lot of things to different folks depending on your vantage point and where you sit in the supply chain. Our business model is based on selling plants and seeds. At the end of the day, we don’t develop oils, extracts and products specifically, but we develop the genetics behind those products.

For us, it’s not only about developing genetics that have the unique qualities or ingredients that a product company might want like CBD, or other minor cannabinoids like THCV for example, but also about making sure that those plants can be produced efficiently and effectively. The first step is to introduce the ingredient to the product. Then the second step is to make sure that growers can grow and produce the plant. That way they can stabilize their supply chain for their product line. Whether it’s for a smokable flower product, or a vape product, or an edible product, it’s really important to make sure that they can reproduce it. That’s really how we think about genetics.

Aaron: What is a smart plant? That’s something I saw on your website.

Jon: It’s really about plants that perform under specific growing regions, or growing conditions. For example, in hemp, it’s one thing to produce CBD or CBG. It’s another thing to be able to produce it efficiently in five different microclimates around the U.S. Growing hemp in Florida or Alabama down on the Gulf Coast versus growing on the Pacific Northwest coast of Washington, or Oregon are two very different growing conditions that require smart plants. Meaning they can grow and thrive in each of those conditions and still produce the intended product. Generally, the different regions don’t overlap. The genetics that you would grow in Pacific Northwest are not going to do as well as some better selected varieties for the South East.

It’s not only different outdoor growing regions, but it’s different production styles too. When you think about regulated cannabis the difference between outdoor and indoor greenhouse is mixed light production. Even with hydroponic type growing methods, there are lots of different ways to grow and produce this plant and it’s not a one size fits all. It’s really about plants that perform well, whether it’s different regions in the United States in outdoor production or different indoor greenhouses with mixed lights and production methods.

Aaron: You market CBG hemp as a product line. What made you start with CBG? Is that a pull from the market or something you guys see trending?

Jon: So I think it’s a little bit of both. We offer CBD dominant varieties and CBG dominant varieties of hemp. We also now have other cannabinoids in the pipeline that we’ll be putting out in different varieties next year. Things like CBC as well as varins, or propyl cannabinoids. Also things like CBDV, CBCV, or CBGV, which are the propylcannabinoid versions of the more familiar compounds.

Their nursery services include breeding, propagation and production of cannabis

There was a lot of market demand for CBG. It was a fairly easy cannabinoid to produce as a single dominant cannabinoid similar to CBD or THC. There’s a lot of up-and-coming demand for some of the other minor cannabinoids. Up until a few years ago, CBD was considered a minor cannabinoid. It wasn’t until Charlotte’s Web in the Sanjay Gupta story that it became a major cannabinoid. So I think we see some level of market pull across the category.

On the flip side of that, we have one of the world’s largest R&D teams and consolidated expertise in terms of cannabis. We see the potential for minor cannabinoids, and even terpenes and other compounds like flavonoids to have wide ranging implications in human health. Everything from wellness products, to active pharmaceutical ingredients, to recreational products. From our perspective, that’s the reason why we’re pushing these ingredients. We believe that there are a lot of good products that come out of this work and the genetics that produce these minor cannabinoids.

Aaron: Okay, great. And then last question, is there anything you’re interested in learning more about?

Jon: I think the most exciting thing for me, given my background in clinical diagnostics and human health, is to see more data around how all of these different compounds of the plant can support improved wellness, health and nutrition. I think we’ve only scratched the tip of the iceberg. This type of research and data collection takes years, even decades, especially to see outcomes over time of people using these products. I’m really excited to see more of that and also hopefully be able to make stronger conclusions about some of the benefits that can be had from this plant.

Aaron: That’s the end of the interview, thanks Jon!

NCIA Publishes Environmental Sustainability Recommendations

By Cannabis Industry Journal Staff
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Earlier this week, the National Cannabis Industry Association (NCIA) published its recommendations for improving environmental sustainability in the cannabis industry. The report, titled Environmental Sustainability in the Cannabis Industry: Impacts, Best Management Practices, and Policy Considerations, was developed by their Policy Council along with experts in the field of environmental sustainability.

The 58-page report is quite comprehensive and covers things like land use, soil health, water, energy, air quality, waste and the negative effects of an unregulated market. While the report goes into great detail on specific environmental policy considerations, like recycling, water usage, energy efficiency and more, it makes a handful of overarching policy recommendations that impact environmental sustainability on a much more macro level.

The report mentions developing a platform for sharing information in the national cannabis industry. The idea here is that information sharing on a national scale for things like energy use can be used as a communication tool for regulators as well as a tool for companies to collaborate and share ideas.

The second more overarching policy recommendation the NCIA makes in this report is “to incorporate environmental best practices and regulatory requirements into existing marijuana licensing and testing processes.” This would help streamline and unify regulations already in place and keeps sustainability in the discussion from the very start.

The last major policy recommendation they make is for incentive programs. They say that governments should incentivize cannabis businesses to operate more sustainably and “prioritize funds provided to businesses where barriers exist to entering the market, such as small- or minority-owned businesses.” The report adds that this could essentially kill two birds with one stone by promoting environmental sustainability and diversity at the same time.

Kaitlin Urso is the lead author of the report and executive project and engagement manager for the Colorado Department of Public Health and Environment. She says that these policy recommendations were designed to benefit everyone. “A successful, socially responsible cannabis industry will require best practices for environmental sustainability. This paper is a vital first step in that effort,” says Urso. “This is important, ongoing work that will benefit everyone. The NCIA’s paper on environmental sustainability is going to inform how we approach important questions related to the future of the cannabis industry.”

To read the report in its entirety, click here.

Drug Plastics & Glass Launches Carbon Footprint Tool

By Cannabis Industry Journal Staff
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According to a press release, Drug Plastics & Glass, a packaging company that specializes in cannabis bottles and closures, announced new tools for their customers to calculate their carbon footprint. The company launched six new sustainability calculators with the goal to help their customers get more informed about their carbon footprint.

According to Jeff Johnson, director of marketing and business development for Drug Plastics, they want to show how small, incremental changes can have a lasting impact on a company’s environmental sustainability.“From switching to more eco-friendly resin and eliminating flame treatment, to calculating the savings gained from choosing PET plastic over glass, or eliminating collateral packaging, these calculators show how making simple changes can have a big impact on the environment,” says Johnson.

Here are some of their sustainability calculators they recently launched:

  • PCR PET Resin Sustainability Calculator: Reduce greenhouse gases by making new products from PCR PET removes plastic from the environment by converting PET plastic discarded by the consumer back into resin that can be used again.
  • Flaming Elimination Calculator: Conserve fossil fuels by opting out of the flame treatment process traditionally used to ensure water-based adhesive labels and silk screening would adhere properly to HDPE, LDPE, and PP bottles. Today, this is not always necessary.*
  • Bag Reduction Calculator: Determine the individual savings when you move to single bagging instead of double bagging bottles and closures inside the carton.
  • Concentrate Elimination Calculator: Switch from white pigmented bottles to those made with resin in its natural color state and eliminate CO2
  • Glass to PET Conversion Calculator: PET requires less energy to produce and saves on transportation costs.
  • Glass to HDPE Conversion Calculator: See the sustainable improvements in weight, transportation costs, and durability when you use HDPE instead of glass.

Sustainable Hemp Packaging is the Future of Industrial Packaging

By Vishal Vivek
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The future of packaging is ripe for capitalization by the drivers of sustainability culture. With the battle lines drawn and forces at play in motion, change is now inevitable. The question arises: how quickly can the industry grow in the space of the next decade?

With an increasing number of nations banning non-biodegradable and petroleum-based plastics in certain uses, the choices at hand have naturally led to bioplastics. Bioplastics are a major ingredient of the renewable packaging industry. We derive them from various renewable agricultural crops, of which hemp is among the chief examples.

The Change for Hemp

The legal ramifications of the European Green Deal and the American Farm Bill of 2018 have created a microcosm where the sustainability discussion has turned into corporate initiatives for crops like industrial hemp, which are a source for bioplastics and numerous other products. The smaller carbon footprint of industrial hemp plays its role in shaping consumer demands towards a greener future.

Farmers are now able to cultivate the plant in the U.S., due to its removal from the list of controlled substances. Agribusinesses and manufacturers are aware of the plant’s versatility, with uses in packaging, building construction, clothing, medicinal oils, edibles like protein powder and hemp hearts, hemp paper and rope. What was once George Washington’s strong consideration as a cash crop for his estate, may gradually become the world’s cash crop of choice.

Hemp’s Sustainability Beckons 

Why is the crop unanimously superior in the aspect of eco-friendliness? Its growing requirements are frugal: water, soil nutrients and pesticides are not needed in large quantities. It absorbs great quantities of carbon dioxide from the atmosphere, and uses it to create 65-75% cellulose content within its biomass. Cellulose is vital in the manufacture of bioplastics. Hemp is also flexible within crop cycles, due to its small harvesting period of only 4 months.

Thus, farmers use it as a rotational crop, allowing them to also cultivate other crops after its harvest. High-quality crops like cotton, though superior in cellulose content and fibrous softness, require far more water quantities, soil nutrients and pesticides. Farmers face greater difficulties in cultivating cotton as a rotational crop, because it requires far more space and time.

Hemp Bioplastics For Packaging                                

We manufacture bioplastics from the hurd and cellulose of the hemp plant. Hemp bioplastics are biodegradable, and take up to a maximum of 6 months to completely decompose; by contrast, normal fossil-fuel-based plastic takes up to 1000 years to decompose.

Manufacturers incorporate these ingredients into existing manufacturing processes for regular plastics, such as injection molding. Thus, we can apply bioplastic ingredients to similar plastics applications, such as packaging, paneling, medical equipment and more. New technologies aren’t necessarily needed, so companies and manufacturers do not have any reservations about its viability as an industry.

Here are a few types of bioplastics derived from hemp:

  1. Hemp Cellulose-based Bioplastics

This is a substance found in plant cell walls. We use cellulose to manufacture a broad range of unique plastics, including celluloid, rayon and cellophane. These plastics are usually entirely organic. We mix cellulose and its variations (such as nanocellulose, made from cellulose nanocrystals) with other ingredients, such as camphor, to produce thermoplastics and the like. Using natural polymer, we process a broad range of bioplastics and corresponding polymers. The difference in their chemical properties is down to the nature of the polymer chains and the extent of crystallization.

  1. Composite Hemp-based Bioplastics

Composite plastics comprise organic polymers like hemp cellulose, as well as an addition of synthetic polymers. They also have reinforcement fibers to improve the strength of the bioplastic, which are also either organic or synthetic. Sometimes, we blend hemp cellulose with other organic polymers like shellac and tree resins. Inorganic fillers include fiberglass, talc and mica.

We call any natural polymer, when blended with synthetic polymers, a “bio composite” plastic. We measure and calibrate these ingredients according to the desired stiffness, strength and density of the eventual plastic product. Apart from packaging, manufacturers use these bioplastics for furniture, car panels, building materials and biodegradable bags.

A composite of polypropylene (PP), reinforced with natural hemp fibers, showed that hemp has a tensile strength akin to that of conventional fiberglass composites. Furthermore, malleated polypropylene (MAPP) composites, fortified with hemp fibers, significantly improved stress-enduring properties compared to conventional fiberglass composites.

  1. Pure Organic Bioplastics With Hemp

We have already generated several bioplastics entirely from natural plant substances like hemp. Hemp fibers, when made alkaline with diluted sodium hydroxide in low concentrations, exhibit superior tensile strength. We have produced materials from polylactic acid (PLA) fortified with hemp fibers. These plastic materials showed superior strength than ones containing only PLA. For heavy-duty packaging, manufacturers use hemp fibers reinforced with biopolyhydroxybutyrate (BHP), which are sturdy enough.

With the world in a state of major change due to the coronavirus outbreak of 2020, the focus is back on packaging and delivery. In this volatile area, perhaps the industry can learn a few new tricks, instead of suffocating itself in old traditions and superficial opportunism. The permutations and combinations of bioplastic technology can serve a swath of packaging applications. We must thoroughly explore this technology.

Hemp’s Future in Packaging

Fossil fuel-based plastic polymers are non-renewable, highly pollutive and dangerous to ecosystems, due to their lifespans. They are some of the most destructive inventions of man, but thankfully could be held back by this crop. Industrial hemp upheld countless industries through human history and now is making a comeback. After existing in relative obscurity in the U.S. due to false connotations with the psychoactive properties of its cousin, it is now back in business.

With the American hemp industry on the verge of a revolution, hemp packaging is primed to take over a significant part of the global packaging sector. The political, economic and environmental incentives for companies to adopt bioplastics are legion. Its lower cost lends to its allure as well. Consumers and agribusinesses are following suit, making the choice to be environmentally-conscious. By 2030, it is estimated that 40% of the plastics industry will be bioplastics.

We can only mitigate the plastic pollution in oceans, landfills and elsewhere, with the use of biodegradable bioplastics; otherwise, animals, humans and plants are getting adversely affected by imperceptible microplastics that pervade vast regions of the Earth. With hemp bioplastics, we use the cleaner, renewable matter of plants to conserve the planet’s sanctity. We can expect this new technology to continue to light the way for other nations, societies and companies to build upon this sustainable plan.

european union states

Why Europe May Serve as an Important Bellwether for Hempcrete Use in the United States

By Stephanie McGraw
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european union states

Hemp-based construction materials are an attractive option for achieving environmentally friendly goals in construction, including reduced emissions and conservation of natural resources. Hemp construction materials dating back to the 6th Century have been discovered in France and it has long been eyed with interest by hemp growers and manufacturers, as well as environmentalists in the United States and abroad. As the European Union moves forward with its 2019 European Green Deal, United States hemp, construction and limestone industries, as well as regulatory agencies, will be provided with an important preview of the benefits, risks and issues arising out of the use of hemp in construction.

The European Green Deal and Circular Economy Action Plan

Hemp applications in construction are gaining increased interest as the EU seeks to neutralize its greenhouse gas emissions by 2050. Much of the specifics for this transition to zero emissions are outlined in the EU’s “A New Circular Economy Action Plan,” announced on March 11, 2020. According to the EU, “This Circular Economy Action Plan provides a future-oriented agenda for achieving a cleaner and more competitive Europe in co-creation with economic actors, consumers, citizens and civil society organisations.” The plan aims at accelerating the transformational change required by the European Green Deal and tackles emissions and sustainability issues across a number of industries and products, including construction.

Construction in the EU accounts for approximately 50% of all extracted natural resources and more than 35% of the EU’s total waste generation. According to the plan, greenhouse gas emissions from material extraction, manufacturing of construction products and construction and renovation of buildings are estimated at 5-12% of total national greenhouse gas emissions. It is estimated that greater material efficiency could save 80% of those emissions. To achieve those savings, the plan announces various efforts to address sustainability, improve durability and increase energy efficiency of construction materials.

How Hemp Could Help Europe Achieve Neutral Emissions

Hemp, and specifically hempcrete, is being eyed with heightened interest as the EU enacts its plan. Indeed, recent mergers and acquisitions in the European hemp industry signal just how attractive this hemp-based product may be as international, national and local green initiatives gain momentum. But how would hemp be utilized in construction and what types of legal issues will this industry face as it expands?

Image: National Hemp Association

The primary hemp-based construction material is “hempcrete.” Hempcrete is typically composed of hemp hurds (the center of the hemp plant’s stalk), water and lime (powdered limestone). These materials are mixed into a slurry. The slurry petrifies the hemp and the mixture turns into stone once it cures. Some applications mix other, traditional construction materials with the hempcrete. The material can be applied like stucco or turned into bricks. According to the National Hemp Association, hempcrete is non-toxic, does not release gaseous materials into the atmosphere, is mold-resistant, is fire– and pest-resistant, is energy-efficient and sustainable. To that last point, hemp, which is ready for harvest after approximately four months, provides clear advantages over modern construction materials, which are either mined or harvested from old forests. Furthermore, the use of lime instead of cement reduces the CO2 emissions of construction by about 80%.

Watching Europe with an Eye on Regulation and Liability Risks

Hempcrete indeed sounds like a wünder-product for the construction industry (and the hemp industry). Unfortunately, while it may alleviate some of the negative environmental impacts of the construction sector, it will not alleviate the threat of litigation in this industry, particularly in the litigious United States. The European Union’s experience with it will provide important insights for U.S. industries.

Hempcrete blocks being used in construction

Because hemp was only recently legalized in the United States with the passage of the 2018 Farm Bill, it is not included in mainstream building codes in the United States, the International Residential Code, nor the International Building Code. Fortunately, there are pathways for the consideration and use of non-traditional materials, like hempcrete, in building codes. However, construction applications of any form of hemp, including hempcrete, at this point would likely require extensive discussions with local building authorities and an application showing that the performance criteria for the building are satisfied by the material. Such criteria would include standards and testing relating to structural performance, thermal performance, and fire resistance. Importantly, the ASTM does have a subcommittee working on various performance standards for hemp in construction applications. European progress on this front would pave an important regulatory pathway for the United States, as well as provide base-line standards for evaluating hempcrete materials.

Insights into regulation and performance standards are not the only reason to watch the EU construction industry in the coming decades. Introduction of hempcrete and hemp-based building materials in the United States will likely stoke litigation surrounding these materials. Although there is no novel way to avoid the most common causes of construction litigation, including breach of contract, quality of construction, delays, non-payment and personal injury, the lessons learned in Europe could provide risk management and best-practice guidance for the U.S. industry. Of particular concern for the hemp industry should be the potential for product liability, warranty, and consumer protection litigation in the United States. The European experience with hempcrete’s structural performance, energy efficiency, mold-, pest- and fire-resistant properties will be informative, not just for the industry, but also for plaintiff attorneys. Ensuring that hempcrete has been tested appropriately and meets industry gold-standards will be paramount for the defense of such litigation and EU practices will be instructive.

The United States construction industry, and particularly hempcrete product manufacturers, should pay close attention as the EU expands green construction practices, including the use of hempcrete. The trials and errors of European industry counterparts will inform U.S. regulations, litigation and risk management best practices.

 

Following Up: Questions From The Infused Products Virtual Conference Answered

By Ellice Ogle
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If you missed the Cannabis Industry Journal’s 3rd Annual Infused Products Virtual Conference last week, one of the speakers, Ellice Ogle, founder and CEO of Tandem Food presented on Food Safety Culture in the Cannabis Industry. An overview of the information in the presentation can be found here, Concentrate On a Food Safety Culture In Your Workplace. Below are answers to some of the post-presentation questions we received, but were unable to answer during the Q&A session. To get your additional questions answered or for a complimentary consultation for your company, specially provided to readers of Cannabis Industry Journal, contact Ellice Ogle at Ellice@tndmfood.com.

Question: What are some recommended digital programs for internal auditing?

Ellice Ogle, founder and CEO of Tandem Food

Ellice Ogle: Before looking at the tools for conducting an internal audit, understand the goal of the internal audit. One key aspect of internal auditing is knowing which standard(s) to audit against. For example, regulatory audits for cGMP certification are different than optional third-party certifications such as any GFSI scheme (SQF, BRC, PrimusGFS, etc). While the standards ultimately have the same goal of food safety with varying focuses, it is important to have an experienced food safety specialist conduct the audit as realistically as possible. The experienced specialist will then be able to recommend an appropriate tool for internal auditing moving forward, whether it is software such as FoodLogiQ, SafetyChain, Safefood 360°, among many others, or simply providing a template of the audit checklist. Overall, the risk of foodborne illnesses can be minimal, but it takes persistence and commitment to achieve a successful food safety culture. Metrics can assist in assessing the commitment to food safety and, as a result of these efforts, you will minimize the risk of compromising the health and safety of your guests, employees, foods and business. If you want a specific example, I’d like to direct you to a case study in partnership with Heylo LLC in Washington state, posted on the Tandem Food website.

Q: What are examples of ways to share environmental monitoring results to enhance a good edible safety culture?

Ellice: In the Control of Listeria monocytogenes in Ready-To-Eat Foods: Guidance for Industry Draft Guidance (2017), the FDA states that “a well-designed environmental monitoring program promotes knowledge and awareness of the environmental conditions that could result in product contamination and is a more effective program than product testing alone.” In other words, environmental monitoring programs and results can identify environmental conditions within a facility that could cause potential contamination. Publishing these findings, for example in the form of a case study or sharing the details of the practice, can enhance the food safety culture in the specific niche industry. For example, to borrow from the meat industry, Tyson Foods, Inc developed and shared environmental monitoring programs that are used by their peers, promoting a unified food safety culture, rather than competitive, guarded secrecy.

Q: Are the food safety requirements the same for retail and manufacturing?

Ellice: The food safety requirements are not exactly the same for retailers and manufacturers. The difference is inherent that retailers are working with finished product while manufacturers are working with raw ingredients and the manufacturing process to develop the finished product. Let’s take a closer look at cannabis regulation in Washington state. Chapter 314-55-104(12) states “Processors creating marijuana extracts must develop standard operating procedures (SOPs), good manufacturing practices (GMPs), and a training plan prior to producing extracts for the marketplace.” Compare this to the requirements for retailers, 314-55-105(11) which states “A marijuana producer, processor or retailer licensed by the WSLCB must conduct the production, processing, storage, and sale of marijuana-infused products using sanitary practices.” While SOPs and GMPs are not explicitly mentioned for retailers as they are for manufacturers, sanitary practices could be documented as Sanitation Standard Operating Procedures (SSOPs). Proper storage practices can also be an overlapping food safety concern with respect to temperature control or pest management systems. Overall, food safety should remain a top priority in maintaining the integrity of the products throughout the supply chain.

Q: To your knowledge, has there been a food safety outbreak associated with a cannabis-based product?

Ellice: One possible cannabis-related death investigated in 2017 uncovered deadly pathogens in medical cannabis. However, to  my knowledge, I have not seen a food safety outbreak associated with a cannabis-based product. There might be any number of reasons that this is so, for example, possibly because a food safety outbreak associated with a cannabis-based product might not have had a large impact to make headlines. Although, with the cannabis industry already misunderstood and a stigma so prevalent to even promote fake news, it is better to prevent an outbreak from ever occurring. One thing to note is that ultimately cannabis is just another ingredient in existing products, of course with special properties. So, the common food safety offenders are present: listeria, Salmonella, E. Coli, among others. On the plant, cannabis food product manufacturers must minimize the risk of mycotoxins produced by molds, pest contamination, and pesticide contamination. For products that contain cannabis infusions or extractions as an ingredient, there is the possibility of the growth of Botulism toxin. Many of these pathogens can be minimized by appropriate heat treatment or maintenance of refrigeration, testing, and by practicing preventive measures. Arguably, the largest potential for pathogenic contamination is due to improper employee handling. To refer to what we discussed earlier, employee training is key, as well as proper enforcement. Having a strong food safety culture ensures that people have the knowledge of food safety risks and the knowledge of preventing outbreaks.

Q: Do any of the panelists know of any efforts to develop a food safety-oriented standard for the cannabis industry?GMP

Ellice: One example of a specific effort to develop a food safety-oriented standard for the cannabis industry includes TraceTrust A True Dose™ & hGMP™ certification. However, there are efforts for other standards that have food safety included. Take organic certification, there are several companies creating and auditing against their own standard such as Clean Green Certified, Oregon Sungrown Farm Certification, or Washington Sungrowers Industry Association. The California Department of Food and Agriculture (CDFA) is also preparing a cannabis program comparable to the USA National Organic Program.

Q: Can you assist with cGMP certification?

Ellice: Yes, Tandem Food LLC is positioned to consult on cGMP certification for manufacturing facilities in the cannabis industry. First, a gap assessment can be conducted to obtain useful actionable data for you, rather than be an intimidating experience. Working from the identified baseline, Tandem Food will work with you to create and implement all related documentation and programs, providing training as necessary. Overall, with the right commitment, cGMP certification can take 6-12 months.

Soapbox

Home Office HACCP During COVID-19

By Nathan Libbey
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With much of the world shutting down and many of us forced to take refuge behind our own doors, we have some time to reflect on what actions led to this. There has been, in my opinion, a clear disconnect between our actions and health outcomes. We need to bridge this gap; We now have a moment to build that bridge. We can start by reassessing our endpoint measurement of health and disease and focusing on what leading measures will impact our lagging results. Think of it as HACCP-lite or home office HACCP. Small changes in the way we think and behave can lead to significant change.

Lagging measures – Lagging measures make great headlines and typically measure an outcome. These are easily quantifiable and therefore receive a good deal of the focus.

Leading measures – Leading measures are inputs that happen during the process and in advance of an outcome.  Leading measures are often difficult to quantify.

This week, Nathan started a “Germ Jar” activity with his kids to track washing.

We are currently focused on the lagging measures for a communicable disease, COVID-19. Illness and death numbers stemming from the pandemic continue to rise, as is expected with more available testing. It is easy for us to dwell on these numbers as they climb and dominate the news. A study in Australia last decade indicated that just over 1% of those experiencing flu like symptoms sought treatment and eventually got tested. I’m not going to use the tip of the iceberg cliché, but there it is. Focusing on the rapidly rising rates of COVID may be easy to do, but it won’t help our future selves.

What we should be doing during this time, however, is looking at our own leading behaviors and how changing them can help prevent this situation from reoccurring.

Here are some inputs we can rethink:

  • Hand washing – The average American uses the restroom 6-7 times per day. This week I started a “Germ Jar” activity with my kids (spring break week!) to track washing. If we wash our hands every time we use the restroom and every time we eat, that’s roughly 10X per day. Our leading indicator of household health, then, is 10 hand washes per day. This principle can, and should be applied to workplaces, including schools, airports and hospitals. What if we had mandatory handwashing prior to airport security and boarding? My estimation is that data would indicate a sharp decline in illness and transmission rates.
  • Disinfecting/Sanitizing – Similar to hand washing, cleaning surfaces serves as a vital indicator of future health. Examples, such as this District in Freeport, Il, indicate that increasing frequency of disinfecting can lead to a dramatic decrease in numbers sick. In my new office setting, we have set a goal via the Germ Jar of 3 times per day wiping down high touch surfaces. As we reenter close-proximity society, we need to have a better understanding of what high touch surfaces are, both for those who are tasked to clean them, as well as those that are doing the touching. Reduction of touches coupled with above washing behaviors post-touch can help prevent disease transmission.

    Nathan’s daughter adding to the Germ Jar
  • Monitoring – Lastly, we need to do a better job at monitoring ourselves and our environments. In my new office, we have enacted a temperature check every morning and night. If we practiced symptom reporting (coughing, sneezing, chills) and monitored temperature in other settings, such as offices and schools, could we start to see pockets of infection and trends? Taking it a step farther, while we invest a tremendous amount of time and money into protecting our food supply from foodborne illness, we rarely discuss preventive monitoring for other diseases, such as influenza and now COVID-19. Technologies are rapidly coming available that will allow us to perform quick diagnostics of both individuals and environments. If we were to monitor the air and surfaces of a school nurse’s office, would we find data that could prevent transmission of disease? Can we transfer HACCP-lite to additional (all) settings?

Over the next weeks and months, we are going to be inundated by the spike in COVID illnesses and deaths. During this time, it is on each of us to realize how our past behaviors led to the state we are in. When we return, viruses will not be absent from the world, our hospitals, schools, offices or our bodies. We can, starting now, begin to measure and change our leading behaviors and begin to shape a healthier future.

Comparable to Organic: How This California Company Aims to Certify Cannabis

By Aaron G. Biros
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Cannabis that contains more than 0.3% THC is not eligible for USDA organic certification, due to the crop’s Schedule I status. While some hemp farmers are currently on the path to obtain a USDA organic certification, the rest of the cannabis industry is left without that ability.

Growers, producers, manufacturers and dispensaries that utilize the same practices as the national organic program should be able to use that to their advantage in their marketing. Ian Rice, CEO of Envirocann, wants to help cannabis companies tap into that potential with what he likes to call, “comparable to organic.”

Ian Rice, CEO of Envirocann & co-founder of SC Labs

Rice co-founded SC Laboratories in 2010, one of the first cannabis testing labs in the world, and helped develop the cannabis industry’s first testing standards. In 2016, Rice and his partners at SC Labs launched Envirocann, a third-party certification organization, focused on the quality assurance and quality control of cannabis products. Through on-site inspections and lab testing, Envirocann verifies and subsequently certifies that best practices are used to grow and process cannabis, while confirming environmental sustainability and regulatory compliance.

“Our backyard in Santa Cruz and the central coast is the birthplace of the organic movement,” says Rice. California Certified Organic Farms (CCOF), founded in Santa Cruz more than 40 years ago, was one of the first organizations in the early 1990s that helped write the national organic program.

“What we came to realize in the lab testing space and as the cannabis market grew, was that a lot of cannabis companies were making the organic claims on their products,” says Rice. “At the time, only one or two organizations in the cannabis space were making an attempt to qualify best practices or create an organic-type feel of confidence among consumers.” What Rice saw in their lab was not cannabis that could be considered organic: “We saw products being labeled as organic, or with certain claims of best practices, that were regularly failing tests and testing positive for banned chemicals. That really didn’t sit well with us.”

Coastal Sun Farms, Enviroganic-certified

At the time, there was no real pathway to certify cannabis products and qualify best practices. “We met with a few people at the CCOF that were very encouraging for us to adopt the national organic program’s standards for cannabis. We followed their lead in how to adopt the standards and apply a certification, building a vehicle intended to certify cannabis producers.”

Because of their background in lab testing they added the requirement for every crop that gets certified to undergo a site inspection, sampling, as well as a pesticide residue test to confirm no pesticides were used at all during the production cycle. One of their clients is Coastal Sun Farms, a greenhouse and outdoor cannabis producer. “They grow incredible products at a high-level, commercial scale at the Enviroganic standard,” says Rice. “They have been able to prove that organic cannabis is economically viable.”

The Envirocann certification goes a bit beyond the USDA’s organic program in helping their clients with downstream supply chain risk management tools (SCRM). “Because of the rigorous testing of products to get certified and go to market, we are getting way ahead of supply chain or production issues,” says Rice. “That includes greater oversight and transparency, not just for marketing the final product.”

A good example of using SCRM to a client’s advantage is in the extraction business. A common scenario recently in the cannabis market involves flower or trim passing the pesticide tests at the lab. But when that flower makes it down the supply chain to a manufacturer, the extraction process concentrates chemical levels along with cannabinoid levels that might have previously been acceptable for flower. “I’ve witnessed millions and millions of dollars evaporate because flower passed, but the concentrated final product did not,” says Rice. “We’ve introduced a tool to get ahead of that decision-making process, looking beyond just a pass/fail. With our partner labs, we look at the chromatograms in greater detail beyond regulatory requirements, which gives us information on trace levels of chemicals we may be looking for. It’s a really rigorous audit on these sites and it’s all for the benefit of our clients.”

Envirocann has also recently added a processing certification for the manufacturing sector and a retail certification for dispensaries. That retail certification is intended to provide consumers with transparency, truth in labeling and legitimate education. The retail certification includes an assessment and audit of their management plan, which goes into details like procurement and budtender education, as well as basic considerations like energy usage and waste management.

Fog City Farms, Envirocann-certified

While Envirocann has essentially adopted the USDA’s organic program’s set of standards for what qualifies organic producers, which they call “Enviroganic,” they also certify more conventional producers with their “Envirocann” certification. “While these producers might not be considered organic farmers, they use conventional methods of production that are responsible and deserve recognition,” says Rice. “A great example for that tier would be Fog City Farms: They are growing indoor with LED lighting and have multiple levels in their indoor environment to optimize efficiency and minimize their impact with waste and energy usage, including overall considerations for sustainability in their business.”

Looking to the future, Ian Rice is using the term “comparable to organic” very intentionally, preparing for California’s roll out of their own organic cannabis program. The California Department of Food and Agriculture (CDFA) is launching the “OCal Comparable-to-Organic Cannabis Program.” Envirocann is obviously using the same language as the CDFA. That’s because Envirocann aims to be one of the verifying agents under the CDFA’s new program. That program will begin on January 1, 2021.

The Power of Prevention: Pathogen Monitoring in Cannabis Cultivation and Processing Facilities

By Nathan Libbey
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As the cannabis market matures and the value chain becomes modernized, it’s important to address product safety in a comprehensive way. In other areas of manufacturing, Hazard Analysis & Critical Control Points (HACCP) has been the standard for reducing hazards both for employees and for the products themselves. A Critical Control Point (CCP) is any spot from conception to consumption where a loss of control can potentially result in risk (Unnevehr, 1996). In the food realm, HACCP has been used to drive quality enhancements since the 1980s (Cichy, 1982).

In a nutshell, HACCP seeks to help identify where a problem may enter a product or environment and how that problem may be addressed before it escalates. In cannabis, these hazards include many of the same problems that food products have: specifically molds, yeasts, and pathogenic bacteria (Listeria, E. coli, etc.). While the current industry standard is to test products at the end stage for these contaminants, this late-stage pass/fail regimen leads to huge lots of destroyed product and a risk for consumer distrust (Yamashiro, 2019). HACCP, therefore, should be applied at every stage of the production process.

Pathogen Environmental Monitoring (PEM) is a tool that can be used to identify CCPs in a cannabis cultivation or processing facility. The main goal of a PEM program is to find a contaminant before it reaches a surface that touches the product or the product itself. PEM is conducted using a pre-moistened swab or a sponge to collect a sample from the cannabis environment. The swab can then be sent to a lab for microbial testing. Keys to an effective PEM are:

1. Start with a broad stroke – When the FDA comes to a facility suspected of producing pathogen-laced food products, they conduct what is known as a Swab-a-thon. A Swab-a-thon is a top to bottom collection of samples, usually totaling 100 or more. Similarly, preemptively swabbing should be the first step in any PEM—swab everything to see what exists as a baseline.

2. Map your scene – identify on a map of your facility the following:

  • Cannabis contact surfaces (CCS) (belts, clippers, tables, etc)
  • Non-cannabis contact surfaces (Non-CCS) (floors, lighting, drains, etc)
  • Flow of air and people (where do air and people enter and where do they go?

Identifying the above zones will help deepen your understanding of where contaminants may come into contact with cannabis and how they may migrate from a Non-CCS to a CCS. 

3. Plan and execute:

  • Based on the results of mapping, and Swab-a-thon, identify where and when you will be collecting samples on a consistent and repeatable basis. Emphasis should be placed on areas that are deemed a risk based on 1) and 2). Samples should be collected at random in all zones to ensure comprehensive screening.

4. Remediate and modify:

  • If you get a positive result during PEM, don’t panic—pathogens are ubiquitous.
  • Remediate any trouble spots with deep cleaning, remediation devices or other protocols.
  • Re-test areas that were positive for pathogens to ensure remediation is successful.
  • Revisit and modify the plan at least once a year and each time a new piece of equipment is added or production flow is otherwise changed.

The steps above are a good starting point for a grower or processor to begin a PEM. Remember that this is not a one-size-fits-all approach to safety; each facility has its own unique set of hazards and control points.

Comprehensive guides for PEM can be found at the links below, many of the concepts can be applied to cannabis production.


https://affifoodsafety.org/lcp/advanced-search/

http://www.centerforproducesafety.org/amass/documents/document/263/Listeria%20Guidance%20UFPA%202013.pdf

Cichy, R. (1982). HACCP as a quality assurance tool in a commissary food-service system. International Journal of Hospitality Management, 1(2), 103-106.

Unnevehr, L., & Jensen, H. (1996). HACCP as a Regulatory Innovation to Improve Food Safety in the Meat Industry. American Journal of Agricultural Economics, 78(3), 764-769.

Yamashiro, C, & Baca, Y. (2019).  Prevent high-value cannabis crop loss with innovative environmental monitoring tool.

Fungal Monitoring: An Upstream Approach to Testing Requirements

By Bernie Lorenz, PhD
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Mold is ubiquitous in nature and can be found everywhere.1 Cannabis growers know this all too well – the cannabis plant, by nature, is an extremely mold-susceptible crop, and growers battle it constantly.

Of course, managing mold doesn’t mean eradicating mold entirely – that’s impossible. Instead, cultivation professionals must work to minimize the amount of mold to the point where plants can thrive, and finished products are safe for consumption.

Let’s begin with that end in mind – a healthy plant, grown, cured and packaged for sale. In a growing number of states, there’s a hurdle to clear before the product can be sold to consumers – state-mandated testing.

So how do you ensure that the product clears the testing process within guidelines for mold? And what tools can be employed in biological warfare?

Mold: At Home in Cannabis Plants

It helps to first understand how the cannabis plant becomes an optimal environment.

The cannabis flower was designed to capture pollen floating in the air or brought by a pollinating insect.

Photo credit: Steep Hill- a petri dish of mold growth from tested cannabis

Once a mold spore has landed in a flower, the spore will begin to grow. The flower will continue to grow as well, and eventually, encapsulate the mold. Once the mold is growing in the middle of the flower, there is no way to get rid of it without damaging the flower.

A Name with Many Varieties

The types of spores found in or around a plant can make or break whether mold will end with bad product.

Aspergillus for example, is a mold that can produce mycotoxins, which are toxic to humans2. For this reason, California has mandatory testing3for certain aspergillus molds.

Another example, Basidiospores, are found outside, in the air. These are spores released from mushrooms and have no adverse effects on cannabis or a cannabis cultivation facility.

Fungi like powdery mildew and botrytis (PM and Bud Rot) typically release spores in the air before they are physically noticed on plants. Mold spores like these can survive from one harvest to the next – they can be suspended in the air for hours and be viable for years.

How Mold Travels

Different types of spores – the reproductive parts of mold – get released from different types of mold. Similar to plants and animals, mold reproduces when resources are deemed sufficient.

The opposite is also true that if the mold is under enough stress, such as a depleting nutrient source, it can be forced into reproduction to save itself.4

In the end, mold spores are released naturally into the air for many reasons, including physical manipulation of a plant, which, of course, is an unavoidable task in a cultivation facility.5

Trimming Areas: A Grow’s Highest Risk for Mold

Because of the almost-constant physical manipulation of plants that happen inside its walls, a grow’s trimming areas typically have the highest spore counts. Even the cleanest of plants will release spores during trimming.

Best practices include quality control protocols while trimming

These rooms also have the highest risk for cross contamination, since frequently, growers dry flower in the same room as they trim. Plus, because trimming can be labor intensive, with a large number of people entering and leaving the space regularly, spores are brought in and pushed out and into another space.

The Battle Against Mold

The prevalence and ubiquitous nature of mold in a cannabis facility means that the fight against it must be smart, and it must be thorough.

By incorporating an upstream approach to facility biosecurity, cultivators can protect themselves against testing failures and profit losses.

Biosecurity must be all encompassing, including everything from standard operating procedures and proper environmental controls, to fresh air exchange and surface sanitation/disinfection.

One of the most effective tactics in an upstream biosecurity effort is fungal monitoring.

Ways to Monitor Mold

Determining the load or amount of mold that is in a facility is and always will be common practice. This occurs in a few ways.

Post-harvest testing is in place to ensure the safety of consumers, but during the growing process, is typically done using “scouting reports.” A scouting report is a human report: when personnel physically inspect all or a portion of the crop. A human report, unfortunately, can lead to human error, and this often doesn’t give a robust view of the facility mold picture.

Another tool is agar plates. These petri dishes can be opened and set in areas suspected to have mold. Air moves past the plate and the mold spores that are viable land on the dishes. However, this process is time intensive, and still doesn’t give a complete picture.

Alternatively, growers can use spore traps to monitor for mold.

Spore traps draw a known volume of air through a cassette.The inside of the cassette is designed to force the air toward a sticky surface, which is capable of capturing spores and other materials. The cassette is sent to a laboratory for analysis, where they will physically count and identify what was captured using a microscope.

Spore trap results can show the entire picture of a facility’s mold concerns. This tool is also fast, able to be read on your own or sent to a third party for quick and unbiased review. The information yielded is a useful indicator for mold load and which types are prevalent in the facility.

Spore Trap Results: A Story Told

What’s going on inside of a facility has a direct correlation to what’s happening outside, since facility air comes infromthe outside. Thus, spore traps are most effective when you compare a trap inside with one set outside.

When comparing the two, you can see what the plants are doing, view propagating mold, and understand which of the spore types are only found inside.

Similar to its use in homes and businesses for human health purposes, monitoring can indicate the location of mold growth in a particular area within a facility.

These counts can be used to determine the efficacy of cleaning and disinfecting a space, or to find water leaks or areas that are consistently wet (mold will grow quickly and produce spores in these areas).

Using Spore Traps to See Seasonality Changes, Learn CCPs

Utilizing spore traps for regular, facility-wide mold monitoring is advantageous for many reasons.

One example: Traps can help determine critical control points (CCP) for mold.

What does this look like? If the spore count is two times higher than usual, mitigating action needs to take place. Integrated Pest Management (IPM) strategies like cleaning and disinfecting the space, or spraying a fungicide, are needed to bring the spore count down to its baseline.

For example, most facilities will see a spike in spore counts during the times of initial flower production/formation (weeks two to three of the flower cycle).

Seasonal trends can be determined, as well, since summer heat and rain will increase the mold load while winter cold may minimize it.

Using Fungal Monitoring in an IPM Strategy

Fungal monitoring – especially using a spore trap – is a critical upstream step in a successful IPM strategy. But it’s not the only step. In fact, there are five:

  • Identify/Monitor… Using a spore trap.
  • Evaluate…Spore trap results will indicate if an action is needed. Elevated spore counts will be the action threshold, but it can also depend on the type of spores found.
  • Prevention…Avoiding mold on plants using quality disinfection protocols as often as possible.
  • Action…What will be done to remedy the presence of mold? Examples include adding disinfection protocols, applying a fungicide, increasing air exchanges, and adding a HEPA filter.
  • Monitor…Constant monitoring is key. More eyes monitoring is better, and will help find Critical Control Points.

Each step must be followed to succeed in the battle against mold.

Of course, in the battle, there may be losses. If you experience a failed mandatory product testing result, use the data from the failure to fix your facility and improve for the future.

The data can be used to determine efficacy of standard operating procedures, action thresholds, and other appropriate actions. Plus, you can add a spore trap analysis for pre- and post- disinfection protocols, showing whether the space was really cleaned and disinfected after application. This will also tell you whether your products are working.

Leveraging all of the tools available will ensure a safe, clean cannabis product for consumers.


References

  1. ASTM D8219-2019: Standard Guide for Cleaning and Disinfection at a Cannabis Cultivation Center (B. Lorenz): http://www.astm.org/cgi-bin/resolver.cgi?D8219-19
  2. Mycotoxin, Aspergillus: https://www.who.int/news-room/fact-sheets/detail/mycotoxins
  3. State of California Cannabis Regulations: https://cannabis.ca.gov/cannabis-regulations/
  4. Asexual Sporulation in Aspergillus nidulans (Thomas H. Adams,* Jenny K. Wieser, and Jae-Hyuk Yu):  https://pdfs.semanticscholar.org/7eb1/05e73d77ef251f44a2ae91d0595e85c3445e.pdf?_ga=2.38699363.1960083875.1568395121-721294556.1562683339
  5. ASTM standard “Assessment of fungal growth in buildings” Miller, J. D., et al., “Air Sampling Results in Relation to Extent of Fungal Colonization of Building Materials in Some Water Damaged Buildings,” Indoor Air, Vol 10, 2000, pp. 146–151.
  6. Zefon Air O Cell Cassettes: https://www.zefon.com/iaq-sampling-cassettes