Scoville and Capsaicin: What the Science of Chili Actually Says 🔬🔥
There’s a frequent misconception around hot peppers: one that reduces their heat to a simple matter of personal tolerance, as if the intensity felt were purely subjective. While it is partially subjective, it actually relies on precise biological and chemical mechanisms. Understanding these mechanisms means understanding why some chilies burn more than others, why milk succeeds where water fails, and exactly how COMEP sauces are crafted around this reality.
The Scoville Scale
In 1912, American pharmacologist Wilbur Scoville published a method to measure the heat of chili peppers. The principle was entirely sensory: a chili extract was diluted in a sugary solution, more and more, until a panel of tasters could no longer perceive any heat. The level of dilution required to reach this threshold became the measurement, expressed in Scoville Heat Units (SHU).
A sweet bell pepper sits at 0 SHU. A jalapeño ranges between 2,500 and 8,000 SHU depending on maturity and growing conditions. A habanero oscillates between 100,000 and 350,000 SHU. The most extreme modern varieties, like the Carolina Reaper or Pepper X, soar past 2 million SHU. In practical terms, the scale is logarithmic in its effects: a habanero isn't just slightly hotter than a jalapeño; it’s roughly twenty times hotter.
Scoville’s original method suffered from one obvious flaw: it depended on the individual sensitivity of the tasters and fell victim to sensory fatigue. Since the 1980s, it has largely been replaced by High-Performance Liquid Chromatography (HPLC). This technique directly measures the concentration of capsaicinoids in a chili extract and converts the result into SHU equivalency. The result is precise, repeatable, and completely independent of human judgment. However, the Scoville scale remains the benchmark for communication, even in professional circles, because it is universally understood.
Capsaicin
Capsaicin is the chemical compound primarily responsible for the burning sensation in chilies. It belongs to the capsaicinoid family, which includes several related molecules, such as dihydrocapsaicin, present in smaller quantities but packing a similar punch.
Its mode of action is neurological, not chemical. Capsaicin binds to TRV1 receptors, which are thermal receptors located in the mucous membranes of the mouth, nose, gastrointestinal tract, and on the skin. These receptors are normally triggered by physical heat starting around 43°C (109°F). Capsaicin activates them without any actual heat being present: the brain receives a burning signal, but no tissue is damaged. It is a molecularly precise thermal illusion.
Because this binding also triggers the release of endorphins, it partly explains why so many people develop a love for spicy food: the perceived pain triggers a chemical compensation response that can become highly enjoyable with tolerance.
Capsaicin is fat-soluble. It dissolves in fats, not in water. This is why drinking water when facing a hot chili is useless, if not counterproductive, as it spreads the capsaicin over a larger surface area. On the other hand, milk, sour cream, yogurt, tahini, or olive oil are highly effective agents: they bind the molecule and wash it away. This property is far from anecdotal for anyone cooking with hot sauces.
What This Changes When Using COMEP Sauces
The fat-solubility of capsaicin has a direct impact on how our sauces behave in the kitchen.
Cooked sauces, like Tanger 1956, Menton 1992, or Etna 1984, are prepared using heat. The cooking process partially alters the capsaicinoids and helps them diffuse into the fats present in the sauce or the dish. Their heat is perceived as more enveloping and progressive.
Lacto-fermented sauces, like Athènes 1985 and Marseille 1993, follow a different logic. Fermentation doesn’t destroy capsaicin, but it transforms the chemical environment in which it expresses itself: lactic acidity alters overall sensory perception, making the heat feel sharper and more immediate. It’s no coincidence that Marseille 1993, the most intense sauce in our lineup at 12 out of 12, is lacto-fermented.
Finally, the pairings we recommend with fatty ingredients (tahini for Izmir 1934 or a cream base for Menton 1992 ) rely precisely on this chemistry. These aren’t just intuitive or purely flavor-driven pairings: they work because the fat binds the capsaicin, prolonging the experience without increasing its aggressiveness.
