allantoinn.

Brit.

/əˈlantəʊɪn/, U.S.

/əˈlæntoʊən/

Forms:

α. 1800s–1900s allantoïn, 1800s– allantoin.

β. 1800s allantoïne, 1800s– allantoine.

Origin: Formed within English, by derivation; modelled on a German lexical item. Etymons: allantois n., -in suffix¹.

Etymology: < allantois n. + -in suffix¹, after German Allantoin (J. Liebig 1831, in Ann. der Physik u. Chem. 21 34); so called because it was discovered in the allantoic fluid of cows. Compare French allantoïne (1831 in Liebig's own translation of his paper).

Chemistry.

A crystalline base which is formed by the oxidation of urate and is the end product of the metabolic breakdown of purines in mammals other than primates.Allantoin is 5-ureidohydantoin; C₄H₆N₄O₃. It is also found in some plants.

ΘΚΠ

the world > matter > chemistry > chemical substances > bases > [noun] > named alkalis or bases > others

lyea700

allantoin1837

1837 Lit. Gaz. 14 Oct. 657/3 Allantoin is, we believe, the only organised substance previously treated in the same manner with the present subject.

1845 R. B. Todd & W. Bowman Physiol. Anat. I. 9 Allantoin, an analogous compound to urea.

1876 tr. P. Schützenberger On Fermentation v. 85 Syntonin, and, in a less degree, allantoin, urea guanine, and uric acid, increase the fermenting power of yeast.

1901 Jrnl. Soc. Chem. Industry 31 Dec. 1345/1 The so-called cordianine, of Peckholt, isolated from the fresh bark, and leaves of Cordia excelsa by extraction with alcohol, is found to be allantoine.

1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) xiii. 299 Allantoïn is a diureide of glyoxylic acid..and is found in the allantoic liquid of the cow, the urine of sucking calves, &c.

1968 New Eng. Jrnl. Med. 8 Feb. 331/1 In most mammals uric acid is promptly converted to allantoin by uricase, but man possesses no uricase in the tissues.

1982 D. Francis Banker ii. 39 Comfrey contains allantoin, a well-known cell proliferant.

2009 Sun (Nexis) 23 Mar. 39 This mini instant-radiance vial is a serum you put on before your make-up... It contains allantoin to soothe and witch-hazel to freshen.

This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021).

单词	allantoin
释义	allantoinn. Brit. /əˈlantəʊɪn/, U.S. /əˈlæntoʊən/ Forms: α. 1800s–1900s allantoïn, 1800s– allantoin. β. 1800s allantoïne, 1800s– allantoine. Origin: Formed within English, by derivation; modelled on a German lexical item. Etymons: allantois n., -in suffix¹. Etymology: < allantois n. + -in suffix¹, after German Allantoin (J. Liebig 1831, in Ann. der Physik u. Chem. 21 34); so called because it was discovered in the allantoic fluid of cows. Compare French allantoïne (1831 in Liebig's own translation of his paper). Chemistry. A crystalline base which is formed by the oxidation of urate and is the end product of the metabolic breakdown of purines in mammals other than primates.Allantoin is 5-ureidohydantoin; C₄H₆N₄O₃. It is also found in some plants. ΘΚΠ the world > matter > chemistry > chemical substances > bases > [noun] > named alkalis or bases > others lyea700 allantoin1837 1837 Lit. Gaz. 14 Oct. 657/3 Allantoin is, we believe, the only organised substance previously treated in the same manner with the present subject. 1845 R. B. Todd & W. Bowman Physiol. Anat. I. 9 Allantoin, an analogous compound to urea. 1876 tr. P. Schützenberger On Fermentation v. 85 Syntonin, and, in a less degree, allantoin, urea guanine, and uric acid, increase the fermenting power of yeast. 1901 Jrnl. Soc. Chem. Industry 31 Dec. 1345/1 The so-called cordianine, of Peckholt, isolated from the fresh bark, and leaves of Cordia excelsa by extraction with alcohol, is found to be allantoine. 1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) xiii. 299 Allantoïn is a diureide of glyoxylic acid..and is found in the allantoic liquid of the cow, the urine of sucking calves, &c. 1968 New Eng. Jrnl. Med. 8 Feb. 331/1 In most mammals uric acid is promptly converted to allantoin by uricase, but man possesses no uricase in the tissues. 1982 D. Francis Banker ii. 39 Comfrey contains allantoin, a well-known cell proliferant. 2009 Sun (Nexis) 23 Mar. 39 This mini instant-radiance vial is a serum you put on before your make-up... It contains allantoin to soothe and witch-hazel to freshen. This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021). < n.1837
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