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单词 phaeophytin
释义

phaeophytinn.

Brit. /ˌfiːə(ʊ)ˈfʌɪtɪn/, U.S. /ˌfeɪoʊˈfaɪtn/
Forms: 1900s– phaeophytin, 1900s– pheophytin.
Origin: A borrowing from German. Etymon: German Phaeophytin.
Etymology: < German Phaeophytin (R. Willstätter & F. Hocheder 1907, in Ann. d. Chem. 354 207; now Phäophytin ) < ancient Greek ϕαιός grey (see phaeism n.) + ϕυτόν plant (see phyton n.) + German -in -in suffix1.
Biochemistry.
A brownish or grey-green compound formed by the degradation of chlorophyll (e.g. by weak acid or by enzymes), the magnesium atom being replaced by two hydrogen atoms; (more fully phaeophytin a, phaeophytin b) either of two forms of this, derived from chlorophyll a and chlorophyll b respectively.
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1907 Jrnl. Chem. Soc. 92 i. 784 The authors have been able..to remove the magnesium quantitatively and to obtain for the first time an ashless compound closely related to chlorophyll. This derivative is an ester, termed phaeophytin.
1921 Bot. Gaz. 71 118 Stoklasa, Sebor, and Senft (47) believe that the autumnal changes of color depend on the hydrolytic fission of chlorophyll and the formation of phaeophytin and phosphatides.
1956 I. L. Finar Org. Chem. II. xix. 697 These phytyl phæophorbides are also known as phæophytins a and b.
1988 L. Stryer Biochem. (ed. 3) xxii. 523 Within picoseconds of excitation, an electron is transferred from P680* to bound pheophytin (Ph), a porphyrin identical to chlorophyll a except that it lacks Mg.
1993 European Jrnl. Phycol. 28 50/1 No Chla derivatives, such as chlorophyllide a, phaeophytin a and phaeophorbide a, were detected.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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n.1907
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