Research Tools for Flavor Researchers Investigating Full-Spectrum Coffee Flavor
Despite the $1.5 billion coffee flavor industry, innovation in coffee flavor has stalled. Decades of attempts to replicate the true flavor and aroma of fresh coffee, created by over 700 volatile compounds, have not been successful. Most available coffee flavors are chemical replicas, such as 2-Furfurylthiol (FFT), guaiacol, various pyrazines, diacetyl, and furaneol, which don’t capture the entire bean when combined. The current state of coffee flavor needs improvement.
We believe that solventless extraction technology, such as supercritical CO₂ extraction, is the best way to capture the authentic flavor and aroma of coffee. Flavor researchers are now discovering that this technology gives them the authentic coffee flavor for the first time ever. With this technology, we have a unique opportunity to innovate within the flavor and aroma industry in ways that we have not previously been able to.
The Science Behind Coffee’s Flavor and Aroma
The delicious coffee flavor and aroma are a symphony of volatile compounds produced during roasting through the chemical processes known as the Maillard reaction and Strecker degradation. These reactions generate chemicals, including furans, pyrazines, phenols, and pyrroles, that contribute to the incredible nutty, roasty, smoky, and smooth notes we associate with a great cup of coffee.
It’s important to know that these aroma compounds are mostly bound within the oils of the coffee bean. When looking to achieve authentic coffee flavor and aroma, you need to create a full-spectrum coffee extract. Flavor researchers have experimented with outdated extraction methods, including solvent-based methods like methylene chloride, which is a known carcinogen, degrades delicate aromas, and creates off-flavors.
What the Flavor Industry has Been Doing
For over 130 years, the global flavor industry has struggled with the notoriously difficult task of replicating the authentic flavor of coffee. The industry’s traditional method, known as aroma-recombination, is a reductionist approach where scientists deconstruct the sensory experience and attempt to rebuild it from a handful of isolated molecules. The chemicals they often use include 2-Furfurylthiol (FFT), guaiacol, various pyrazines, diacetyl, and furaneol.
Extraction is also used (e.g., guaiacol from wood tar), and so is biotechnology (e.g., diacetyl from fermentation). These lab-made and extracted flavors are used in products where real coffee seems impractical, such as candies. Candy brands like Werther’s Original and Kopiko often employ a hybrid approach, combining coffee extract with artificial ingredients. When solvent-based extraction is used, it often leaves toxic residues and degrades delicate aromas with high heat. Needless to say, a full-spectrum coffee flavor is not achieved this way.
The Supercritical and Subcritical CO₂ Solution for Full-Spectrum Flavor
Supercritical and carbon dioxide (CO₂) extraction is the solution to these challenges. This green technology utilizes CO₂, a non-toxic, non-flammable, and naturally abundant solvent, in its supercritical state, which is a unique phase where it possesses the properties of both a liquid and a gas. This allows it to penetrate the coffee grounds like a gas while dissolving the valuable, fat-soluble aroma compounds like a liquid solvent.
One of the greatest advantages of a supercritical CO2 extractor is its low-temperature operation. Since the critical temperature for CO₂ is just 31.3°C, extraction can occur without the high heat that degrades sensitive aromatic compounds, preserving the coffee’s authentic flavor. The process is capable of capturing a full-spectrum extract, including the terpenes, lipids, and aldehydes that are lost in the chemical construction method, creating a more complete representation of the roasted coffee bean. After extraction, the CO₂ simply returns to its gaseous state and is easily removed, leaving behind a pure, residue-free coffee extract.
Subcritical CO₂ extraction is a highly selective process that effectively preserves the delicate flavor and aroma compounds in coffee, as it minimizes the removal of unwanted oils. This technique allows for a more targeted extraction of authentic aromatic molecules and can be performed in the same machine.
CO₂ technology is uniquely capable of producing both large yields and high-quality extracts. A batch of ground coffee can first undergo a high-pressure water extraction to capture water-soluble components, followed immediately by a supercritical CO₂ flush in the same vessel. This second step recovers the valuable oils and aromatics left behind, increasing total yield by an estimated 15-20% and producing a dry, sterile, and repurposable by-product.
Water Removal With Falling Film Evaporation
A falling film evaporator, like the fracTron-1000, can be employed for its rapid and complete removal of water from the extract. As a three-stage falling film distillation system, it allows for three independent fractional separations with precise temperature controls at each stage. This enables flavor researchers to segment the different volatile aroma compounds, making it possible to selectively remove undesirable pungent molecules like furfural while retaining desirable fruity ones like ethyl acetate.
Other Useful Techniques
A wiped film distillation unit, such as our clearSTILL-400, and a preparative chromatography system, like the pure99-x, are designed to separate the complex coffee oil into its individual components. This allows for the isolation of specific flavor molecules, enabling them to be standardized and identified. This level of control allows flavor researchers to create replicable flavor profiles.
A New Era for Flavor Companies
Supercritical CO₂ extraction, fractionation, and chromatography enable flavor companies to create authentic coffee fractions, leaving behind chemicals that fail to capture the authentic taste of coffee. These technology platforms will allow you to produce authentic coffee flavors for ready-to-drink beverages, instant coffees, and innovative uses in marinades, sauces, and confectionery.
The Authentic Flavor Solution for Flavor Researchers
Lead the way in flavor innovation and replace chemicals with solvent-free technology. Our E-140 Supercritical CO₂ Extractor delivers the industrial power and control needed for full-spectrum extraction. Ask about our fracTron-1000 falling film evaporator if you require water removal from your extracts, as well as our clearSTILL-400 wiped film evaporator and industrial pure99-x chromatography unit for flavor standardization. We offer pilot runs, allowing you to compare your current setup to advanced CO₂ technology.
Connect with extraktLAB to discover how our GMP-compliant platforms can help develop your authentic coffee flavors.
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