α. 1800s–1900s allantoïn, 1800s– allantoin.
β. 1800s allantoïne, 1800s– allantoine.
allantoinn.
/əˈlantəʊɪn/, U.S. /əˈlæntoʊən/ 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.
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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).
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