Noun Xanthin Definition and Examples







A crystalline compound found in blood and urine which is an intermediate in the metabolic breakdown of nucleic acids to uric acid.
  1. 'Stones can be composed of calcium, oxalate, urate, cystine, xanthine, phosphate, or all of these.'
  2. 'Red beets, another highly colored vegetable, get their scarlet color from a combination of the purple pigment cyanin and the yellow pigment xanthin.'
  3. 'Ice cream gives a little calcium, and chocolate offers plant chemicals called xanthins that can be healthful in moderation.'
  4. 'Ephedrine and the xanthines, such as caffeine and theophylline, increase metabolic rate.'
  5. 'Methyl xanthines (caffeine, theophylline and theobromine) are found in seeds and leaves of a variety of unrelated plant species, including coffee, tea, cocoa, cola and mate.'
((n.) A crystalline nitrogenous body closely related to both uric acid and hypoxanthin, present in muscle tissue, and occasionally found in the urine and in some urinary calculi. It is also present in guano. So called from the yellow color of certain of its salts (nitrates).|--|(n.) A yellow insoluble coloring matter extracted from yellow flowers; specifically, the coloring matter of madder.|--|(n.) One of the gaseous or volatile decomposition products of the xanthates, and probably identical with carbon disulphide.|--|)

Mid 19th century: from xanthic + -ine.

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