Multiple choice The bitterness in chillies is because of a sulphur alkaloid cucurbitacin formic acid content capsicinoid/capsicin content Reveal answer Fill a bubble to check yourself D Correct answer Explanation Capsaicinoids (including capsaicin) are chemical compounds that produce the burning sensation and bitterness in chillies. They stimulate pain receptors in the mouth and skin, creating the sensation of heat.