Blog Post
In the early days of the infused beverage market, flavor neutrality and potency consistency were the priorities for cannabinoid input. It made high-purity THC distillate the obvious standard because it is scalable to manufacture, highly refined after stripping the plant aroma, and robust during the emulsification process. The minimal sensory notes of THC distillate emulsion make it possible for brands to create infused beverages with highly customized flavor profiles.
As the market matures, educated consumers and connoisseurs are no longer just chasing mg of THC but searching for the authentic, complex essence of the living plant in an infused beverage. Live rosin is at the forefront of this premium movement.
In the U.S., rosin-infused products are driving premiumization across dispensary shelves. In Canada, where the beverage sector is tightly regulated, solventless offerings have emerged as the premier tier of infused beverages. Since the very beginning of this movement, Vertosa has been highly involved. Today, I am inviting our Director of Manufacturing, Austin White, to show you how Vertosa makes Rosin drinkable while maintaining its essence, offering consumers the opportunity to sip on a whole-plant experience.
How is rosin produced and why is it premium?
When producing live rosin, the process centers on one goal: preserve trichomes and their contents as much as possible. And, not surprisingly, it all starts with the right plants. Since not all cannabis genetics are ideal for solventless processes, proper selection of cultivars with abundant glandular trichomes that separate cleanly from stalks and plant matter is important. Those plants must be grown out to the proper stage of maturity, when the trichomes are fully developed, separate easily from their stalks, and cannabinoids and terpenes are synthesized but not overly aged. Before harvest, defoliation of large fan leaves reduces the amount of chlorophyll that may leach into the process. The biomass must be properly harvested, usually manually and with limited touchpoints, and immediately placed in cold storage to preserve the cannabinoid and terpene profile of the living plant. After that, it basically comes down to four key steps: wash, filter, dry, and press.
During the washing process, fresh-frozen flower is added to a chilled water bath. Low temperature, combined with gentle agitation, separates the glandular trichomes from their stalks. During filtration, trichome-laden water is carefully pumped through a series of fine mesh screens, separating the trichomes by their size. The resulting trichome fractions are then either air-dried or freeze-dried to remove excess moisture, preventing mold and oxidation. Selected trichome fractions are then placed in a fine mesh bag, usually stainless or nylon, and pressed between heated plates to extract the cannabinoids and terpenes from the trichomes.
Whether we look at the required harvest or processing conditions, producing rosin does not scale as easily as other extraction methods do. Every batch goes through careful, slow, and largely manual handling. There are no chemical processes available to refine inferior input material, like in distillation or hydrocarbon extraction. The cannabinoids, the full terpene profile, and a handful of smaller aromatic compounds all must stay intact. Many of these compounds wouldn’t survive ethanol extraction processes, which is why more consumers are turning to live rosin for nuanced effects and sensory profiles.
Vertosa’s standard on rosin quality for beverages
We believe great inputs are a requirement for great finished products, which is key to delivering the target effect in beverages. When sourcing rosin for emulsion manufacturing, our team identified two critical processes that dictate the quality of the end product.
1. Removing lipids, waxes, and particulates
Rosin retains plant-derived fats, waxes, and lipids from the trichomes, which are typically not remediated through freeze precipitation like other extracts intended for inhalation. These contaminants present challenges in emulsion manufacturing and may create colloidal instability in a finished beverage product. Some issues we’ve encountered are:
- Visual turbidity: Heavy plant waxes do not disperse cleanly at the droplet-scale. If unrefined rosin is introduced to a standard emulsification setup, it may yield a cloudy, optically turbid beverage. It may also form an unappealing white ring at the neck of the package, a failure known as O-ring.
- Phase separation and coalescence: In an oil-in-water emulsion, unrefined lipids act as sites for phase separation. They disrupt the interfacial film, causing droplets to clump together (flocculation) or merge into larger droplets (coalescence), ultimately destabilizing the system.
- Off-flavors: When exposed to oxygen and light over time, raw lipids undergo oxidation, introducing stale, grassy, or waxy off-flavors that impact the drink’s sensory profile.
Therefore, a pristine rosin input ready for emulsion must rely on solventless dewaxing, such as low-temperature mechanical centrifugation or delicate mechanical oil-phase filtration to separate the high-viscosity waxes from the active cannabinoids while maintaining 100% solvent-free purity.
2. The delicate thermodynamics of decarboxylation
In its raw state, cannabis rosin contains cannabinoids primarily in their acidic forms, primarily tetrahydrocannabinolic acid (THCA). Because THCA is non-psychoactive and cannot bind effectively to CB1 receptors, it must be activated into Δ9-tetrahydrocannabinol (THC) for consumers to feel its effects in a beverage.
Decarboxylation is a necessary step where heat cleaves the carboxyl group (-COOH) from the THCA molecule, releasing it as carbon dioxide (CO₂) gas. This chemical transformation triggers an unavoidable, theoretical mass loss of some of the volatile compounds. If an operator decarboxylates rosin too quickly or at higher temperatures (above 250°F / 121°C), they may strip the delicate top notes, creating a less nuanced sensory experience.
To solve this, solventless extractors leverage techniques like “Jar Tech”, a closed-system decarboxylation method governed by the laws of Vapor-Liquid Equilibrium (VLE):
- Rosin is loaded into a pressure-resistant borosilicate glass vessel, filling it to a maximum of 50% capacity to maintain enough headspace. The rosin may expand significantly as CO₂ is actively outgassed.
- The lid is tightened finger-tight. As gentle heat is applied, the escaping CO₂ and volatilized terpenes accumulate in the headspace, building positive pressure. According to Raoult’s and Dalton’s laws of partial pressures, this positive overpressure suppresses the vaporization rate of the liquid terpenes.
- Once the reaction completes, the vessel is cooled slowly and kept tightly sealed. This allows the vaporized terpenes in the pressurized headspace to re-condense and dissolve back into the liquid rosin matrix, locking in the authentic strain-specific aromatic profile.
- The reaction is monitored closely through its visual bubble cycle. First, the rosin melts into a low-viscosity liquid. As THCA activates, tiny carbon dioxide bubbles form a highly active, frothy foam. The reaction decelerates as bubbles slowly become larger, and is deemed complete only when all bubbling stops and the liquid becomes perfectly transparent.
- More sophisticated equipment is available that relies on direct measurements of jar pressure instead of visual signals, ensuring rosin is completely decarboxylated before use but not heated unnecessarily.
Vertosa’s customized process for rosin emulsification
THC distillate is a forgiving input, which can take the heat and shear of high-energy homogenization without much to lose. Rosin doesn’t have that same margin. It’s a premium input carrying a much wider mix of delicate compounds. That’s why, instead of running rosin through our standard SOP, we built a gentler, low-impact emulsification process to preserve rosin’s characteristics the best we can.
1. Interim mechanical filtration
Even after solventless dewaxing, decarboxylated rosin can contain microscopic organic particulate contaminants, such as microscopic trichome stalks, cell wall fragments, or dust. While invisible to the naked eye, these micro-contaminants can be highly hydrophilic or polar, meaning they compete with emulsifiers for coverage on the oil-droplet surfaces, skewing particle size distribution and potentially fouling equipment.
To eliminate this, Vertosa introduced a delicate filtration procedure within the emulsification process. Once the decarboxylated rosin is melted and homogenized into our active oil phase, it passes through a low-micron, high-surface-area filtration system. This step physically captures micro-debris, titanium particles shed from ultrasonic probes, and lingering plant particulates from the liquid, clarifying the oil phase without adsorbing or stripping the active cannabinoids or the delicate terpene matrix.
2. Thermal management
High-shear mixers and high-pressure homogenizers generate rapid friction. Without adequate chilling, it may cause the temperature of an emulsion batch to spike rapidly during processing. Vertosa already had a very robust chilling process to maintain the process temperature below 40°C to protect volatile compounds and prevent off-flavors. To further protect temperature-sensitive input material like rosin, we expanded our process temperature controls to include the interaction chamber, where the biggest mechanical lift of emulsification happens. As these chambers constantly generate high pressure, the heat can accumulate locally, which is rapidly dissipated. This is not necessarily a problem for other inputs, but to preserve the delicate components within rosin, we implemented temperature-controlled, liquid-jacketed interaction chambers connected to high-capacity recirculating chillers. The entire homogenization and emulsification process is monitored via real-time digital thermocouples and maintained strictly below 40°C (104°F) from start to finish. By doing so, we prevent thermal degradation, stop terpene off-gassing in its tracks, and eliminate the risk of oxygen-accelerated oxidation.
The premiumization of infused beverages
As consumers grow increasingly sophisticated, the demand for chemical-free processing and holistic, strain-true effects will only continue to accelerate.
For years, beverage formulators were told that solventless rosin was too difficult, too waxy, and too heat-sensitive to succeed in a water-soluble format. Vertosa has broken that barrier. We are proud to give craft beverage makers the power to preserve the soul of the cannabis plant, from the field to the very last sip.
Dr. Harold Han — the “Happy Chemist” — combines his storied background in emulsion chemistry and science with curiosity and fascination in the rapidly growing cannabis industry. Developing nano and micro emulsions his entire career, Harold holds a Ph.D in Surface Chemistry from NYU and is the holder of multiple patents for his inventions in emulsion chemistry.
As the Chief Science Officer at Vertosa, Harold spearheads the company’s development of industry-leading and customized active ingredients for infused product makers, offering pre-suspended aqueous solutions to create incredibly homogenous and stable products while maximizing bioavailability, clarity, and taste.
To learn more about the science of cannabis, make sure to follow Harold on LinkedIn and check out his Happy Chemist videos.