Definition of xanthine in English:

xanthine

noun ˈzanθiːn

mass nounBiochemistry

1A crystalline compound found in blood and urine which is an intermediate in the metabolic breakdown of nucleic acids to uric acid.
〔生化〕黄嘌呤
A purine derivative; chemical formula: C₅H₄N₄O₂
Example sentencesExamples
- Xanthine oxidase catalyses the oxidation of xanthine and hypoxanthine to uric acid and is a well-known producer of superoxide radicals.
- Stones can be composed of calcium, oxalate, urate, cystine, xanthine, phosphate, or all of these.
- Xanthine oxidase activity was evaluated by the spectrophotometric measurement of the formation of uric acid from xanthine.
- Red beets, another highly colored vegetable, get their scarlet color from a combination of the purple pigment cyanin and the yellow pigment xanthin.
- It appears that the purine metabolic system in humans has found a way to avoid the overproduction of uric acid by downregulating the Xor gene expression, the product converting hypoxanthine to xanthine and further xanthine to uric acid.
1. 1.1count noun Any of the derivatives of xanthine, including caffeine and related alkaloids.
  黄嘌呤衍生物（如咖啡因和相关生物碱）
  Example sentencesExamples
  Ephedrine and the xanthines, such as caffeine and theophylline, increase metabolic rate.
  Ice cream gives a little calcium, and chocolate offers plant chemicals called xanthins that can be healthful in moderation.
  From that time forward into the present, methyl xanthines have been used, most often in the form of theophylline or the water-soluble, related compound aminophylline, for the treatment of asthma.
  The main components of this tea are natural xanthines such as caffeine, theobromine, theophylline and tanni.
  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.

Origin

Mid 19th century: from xanthic + -ine⁴.

Definition of xanthine in US English:

xanthine

noun

Biochemistry

1A crystalline compound found in blood and urine which is an intermediate in the metabolic breakdown of nucleic acids to uric acid.
〔生化〕黄嘌呤
A purine derivative; chemical formula: C₅H₄N₄O₂
Example sentencesExamples
- Stones can be composed of calcium, oxalate, urate, cystine, xanthine, phosphate, or all of these.
- Xanthine oxidase catalyses the oxidation of xanthine and hypoxanthine to uric acid and is a well-known producer of superoxide radicals.
- It appears that the purine metabolic system in humans has found a way to avoid the overproduction of uric acid by downregulating the Xor gene expression, the product converting hypoxanthine to xanthine and further xanthine to uric acid.
- Red beets, another highly colored vegetable, get their scarlet color from a combination of the purple pigment cyanin and the yellow pigment xanthin.
- Xanthine oxidase activity was evaluated by the spectrophotometric measurement of the formation of uric acid from xanthine.
1. 1.1 Any of the derivatives of xanthine, including caffeine and related alkaloids.
  黄嘌呤衍生物（如咖啡因和相关生物碱）
  Example sentencesExamples
  From that time forward into the present, methyl xanthines have been used, most often in the form of theophylline or the water-soluble, related compound aminophylline, for the treatment of asthma.
  Ephedrine and the xanthines, such as caffeine and theophylline, increase metabolic rate.
  The main components of this tea are natural xanthines such as caffeine, theobromine, theophylline and tanni.
  Ice cream gives a little calcium, and chocolate offers plant chemicals called xanthins that can be healthful in moderation.
  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.

Origin

Mid 19th century: from xanthic + -ine.

词汇	xanthine
释义	Definition of xanthine in English: xanthine noun ˈzanθiːn mass nounBiochemistry 1A crystalline compound found in blood and urine which is an intermediate in the metabolic breakdown of nucleic acids to uric acid. 〔生化〕黄嘌呤 A purine derivative; chemical formula: C₅H₄N₄O₂ Example sentencesExamples Xanthine oxidase catalyses the oxidation of xanthine and hypoxanthine to uric acid and is a well-known producer of superoxide radicals. Stones can be composed of calcium, oxalate, urate, cystine, xanthine, phosphate, or all of these. Xanthine oxidase activity was evaluated by the spectrophotometric measurement of the formation of uric acid from xanthine. Red beets, another highly colored vegetable, get their scarlet color from a combination of the purple pigment cyanin and the yellow pigment xanthin. It appears that the purine metabolic system in humans has found a way to avoid the overproduction of uric acid by downregulating the Xor gene expression, the product converting hypoxanthine to xanthine and further xanthine to uric acid. 1.1count noun Any of the derivatives of xanthine, including caffeine and related alkaloids. 黄嘌呤衍生物（如咖啡因和相关生物碱） Example sentencesExamples Ephedrine and the xanthines, such as caffeine and theophylline, increase metabolic rate. Ice cream gives a little calcium, and chocolate offers plant chemicals called xanthins that can be healthful in moderation. From that time forward into the present, methyl xanthines have been used, most often in the form of theophylline or the water-soluble, related compound aminophylline, for the treatment of asthma. The main components of this tea are natural xanthines such as caffeine, theobromine, theophylline and tanni. 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. Origin Mid 19th century: from xanthic + -ine⁴. Definition of xanthine in US English: xanthine noun Biochemistry 1A crystalline compound found in blood and urine which is an intermediate in the metabolic breakdown of nucleic acids to uric acid. 〔生化〕黄嘌呤 A purine derivative; chemical formula: C₅H₄N₄O₂ Example sentencesExamples Stones can be composed of calcium, oxalate, urate, cystine, xanthine, phosphate, or all of these. Xanthine oxidase catalyses the oxidation of xanthine and hypoxanthine to uric acid and is a well-known producer of superoxide radicals. It appears that the purine metabolic system in humans has found a way to avoid the overproduction of uric acid by downregulating the Xor gene expression, the product converting hypoxanthine to xanthine and further xanthine to uric acid. Red beets, another highly colored vegetable, get their scarlet color from a combination of the purple pigment cyanin and the yellow pigment xanthin. Xanthine oxidase activity was evaluated by the spectrophotometric measurement of the formation of uric acid from xanthine. 1.1 Any of the derivatives of xanthine, including caffeine and related alkaloids. 黄嘌呤衍生物（如咖啡因和相关生物碱） Example sentencesExamples From that time forward into the present, methyl xanthines have been used, most often in the form of theophylline or the water-soluble, related compound aminophylline, for the treatment of asthma. Ephedrine and the xanthines, such as caffeine and theophylline, increase metabolic rate. The main components of this tea are natural xanthines such as caffeine, theobromine, theophylline and tanni. Ice cream gives a little calcium, and chocolate offers plant chemicals called xanthins that can be healthful in moderation. 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. Origin Mid 19th century: from xanthic + -ine.
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