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pepsin n. 胃液素,酸蛋白酶 胃液素,酸蛋白□ pepsin n 1: an enzyme produced in the stomach that splits proteins into peptonesPepsin \ Pep" sin\ ( p[ e^] p" s[ i^] n), n. [ Gr. pe` psis a cooking, digesting, digestion, fr. pe` ptein, pe` ssein, to cook, digest: cf. F. pepsine. Cf. { Dyspepsia}.] ( Physiol. Chem.) A proteolytic enzyme ( MW 34, 500) contained in the secretory glands of the stomach. In the gastric juice it is united with dilute hydrochloric acid ( 0. 2 per cent, approximately) and the two together constitute the active portion of the digestive fluid. It degrades proteins to proteoses and peptides, and is notable for having a very low pH optimum for its activity. It is the active agent in the gastric juice of all animals. [ 1913 Webster PJC] Note: As prepared from the glandular layer of pigs' or calves' stomachs it constitutes an important article of pharmacy. [ 1913 Webster]
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