peptasen.

Brit.

/ˈpɛpteɪz/, U.S.

/ˈpɛpˌteɪz/,

/ˈpɛpˌteɪs/

Origin: Formed within English, by derivation; probably modelled on a German lexical item. Etymons: peptone n., -ase suffix.

Etymology: < pept- (in peptone n.) + -ase suffix, probably after German Peptase (R. Wagner Handb. der chem. Technol. (1898) 901).

Biochemistry. Now disused.

Originally: an enzyme which hydrolyses proteins. In later use: an enzyme which hydrolyses peptones.

ΚΠ

1900 H. W. Felter & J. U. Lloyd King's Amer. Dispensatory (ed. 18) II. 997 A second ferment, peptase, forms during malting, whose action is to change the proteids into peptones and parapeptones.

1909 Ann. Bot. 23 16 The peptones are proteases of which the digestive activity is limited to the peptonization of more complex proteins.

1934 C. C. Steele Introd. Plant Biochem. xv. 166 Those [plant proteases] which hydrolyse proteoses, peptones, and polypeptides to amino-acids,..[are] sometimes called peptases (hydrolysing peptones) and peptidases (hydrolysing peptides).

1937 New Phytologist 36 45 Grassmann distinguishes two main groups of proteolytic enzymes, the proteinases and the peptidases.

This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).

单词	peptase
释义	peptasen. Brit. /ˈpɛpteɪz/, U.S. /ˈpɛpˌteɪz/, /ˈpɛpˌteɪs/ Origin: Formed within English, by derivation; probably modelled on a German lexical item. Etymons: peptone n., -ase suffix. Etymology: < pept- (in peptone n.) + -ase suffix, probably after German Peptase (R. Wagner Handb. der chem. Technol. (1898) 901). Biochemistry. Now disused. Originally: an enzyme which hydrolyses proteins. In later use: an enzyme which hydrolyses peptones. ΚΠ 1900 H. W. Felter & J. U. Lloyd King's Amer. Dispensatory (ed. 18) II. 997 A second ferment, peptase, forms during malting, whose action is to change the proteids into peptones and parapeptones. 1909 Ann. Bot. 23 16 The peptones are proteases of which the digestive activity is limited to the peptonization of more complex proteins. 1934 C. C. Steele Introd. Plant Biochem. xv. 166 Those [plant proteases] which hydrolyse proteoses, peptones, and polypeptides to amino-acids,..[are] sometimes called peptases (hydrolysing peptones) and peptidases (hydrolysing peptides). 1937 New Phytologist 36 45 Grassmann distinguishes two main groups of proteolytic enzymes, the proteinases and the peptidases. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022). < n.1900
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