| 单词 | alpha-hydroxy acid |
| 释义 | > as lemmasalpha-hydroxy acid alpha-hydroxy acid n. Chemistry any of a class of aliphatic carboxylic acids that have a hydroxyl substituent at the carbon atom adjacent to the carboxyl group, some of which are used in skincare products for their exfoliating properties; abbreviated AHA.Alpha-hydroxy acids have the general formula RR′C(OH)COOH, where R and R′ represent alkyl groups. ΚΠ 1885 I. Remsen Org. Chem. x. 161 Lactic acid, inactive ethylidene-lactic acid, α-hydroxy-propionic acid.] 1899 Jrnl. Chem. Soc. 75 i. 1027 By substituting an α-hydroxy-acid for the α-keto-alcohol in the foregoing reaction, it might be possible to prepare oxazolones (ketodihydro-oxazoles). 1922 Science 27 Oct. 491/1 The preparation of aromatic alpha hydroxy acids and their esters from the cyanhydrins. 1964 N. G. Clark Mod. Org. Chem. xiv. 280 Two α-hydroxy-acids, glycollic acid, HO.CH2.COOH, and lactic acid, CH3.CH(OH).COOH. 2006 San Diego Mag. June 46/1 She applies alpha-hydroxy acids to remove dull surface cells and promote the skin's renewal process. < as lemmas |
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