单词	triterpene
释义	triterpene /trʌɪˈtəːpiːn / noun Chemistry Any of a group of terpenes found in plant gums and resins, having unsaturated molecules based on a unit with the formula C30H48.The leaves of the plant contain alkaloids, glycosides, triterpenes, tannins, volatile bases and probably other substances.... Cucurbitacins are oxygenated tetracyclic triterpenes that have been shown to have emetic, antineoplastic, and cytotoxic effects on herbivores, resulting in feeding and oviposition deterrence and reduced growth of consumers. Terpenoids are classified according to the number of isoprene units they contain: monoterpenes, sesquiterpenes, diterpenes, triterpenes, tetraterpenes and polyterpenes. Derivatives triterpenoid adjective & noun ... White, red, and tree peony contain glycosides (most notably paeoniflorin), flavonoids, proanthocyanidins, tannins, terpenoids, triterpenoids, and complex polysaccharides that may all contribute to its medicinal effects. Indeed, triterpenoid saponins with an acyl side chain have been shown to increase membrane permeability of endothelial cells, whereas those lacking the side chain did not. Structurally, avicins are part of a greater family of molecules called triterpenoid saponins.
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