Noun Xanthine 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.'

noun, Biochemistry, Chemistry.

1. a crystalline, nitrogenous compound, C 5 H 4 N 4 O 2 , related to uric acid, occurring in urine, blood, and certain animal and vegetable tissues.

2. any derivative of this compound.


"There can be xanthine dehydrogenases."

Mid 19th century: from xanthic + -ine.

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