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🌶 Why Chilli Burns: Capsaicin, Receptors, and Dairy Relief

The burn is not heat. It is an oil opening the same door a stove uses, and water cannot talk it down.

3
lessons
~10 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. The oil lives in the ribsName capsaicin as a hydrophobic molecule made in the placenta, scored by Scoville's tasting and used to deter some seed predators.Like dissolves like. Seeds are innocent. Scoville is a dilution, HPLC ×16 a conversion. Tewksbury's plant hired a bird.
  2. The same wire as a stoveRead the burn as TRPV1 opening — about 43°C or capsaicin — and see why water and beer cannot evict the ligand.One channel, two keys. Chemesthesis, not taste. Beer is 4–6% alcohol. The tap gives the oil a tour.
  3. Dairy is a solventUse Nolden's drinks and Kilah's chemistry to pick milk or yogurt, and treat Scoville numbers as dose.Skim equalled whole. Plant milks lack casein. Tonight, skip the tap and ask which lie you swallowed last Saturday.

Questions this course answers

Where does a chilli actually make capsaicin?

Aza-González et al., Plant Cell Reports, 2011: Capsicum fruits synthesise and accumulate capsaicinoids in placental tissues. Seeds sit against that tissue and get coated.

About what temperature made Julius's cloned TRPV1 jump open in Rosen's oocyte experiment?

Tobias Rosen, in Julius's lab, warmed a frog egg expressing TRPV1 past about 43°C and saw the current jump — the same range people call painful heat. Caterina et al., Nature 1997.

Match each drink to what it can actually do to capsaicin

Kilah: like dissolves like; beer is 4–6% alcohol. Nolden: skim equalled whole, both beat water. Raita is yogurt on purpose.

Put Julius's path from bite to burn in the order it actually happens

Caterina, Julius, Nature 1997: one ion channel, activated by capsaicin and by noxious heat. Kilah: water cannot remove the ligand.

How labs turn a chromatogram into a Scoville number

Chromatography Today: multiply the ppm of capsaicinoids by 16 to print SHU. A jalapeño is 2,500–8,000 on that converted scale.

In your own words, why did skim milk work as well as whole milk against chilli burn in Nolden's 2019 tests?

Nolden: skim equalled whole; the authors say that result is consistent with protein mattering more than lipid, but call for more work on the mechanism. Kilah describes casein as an emulsifier with affinity for capsaicin. Plant milks lack casein (Rood, Cleveland Clinic).

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