| 单词 | phaeophytin a |
| 释义 | > as lemmasphaeophytin a 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. ΘΚΠ the world > matter > chemistry > organic chemistry > esters > [noun] > named oxalic ether1788 margarate1819 acrylate1843 urethane1856 tropeine1880 malonic ester1881 heavy oil of wine1882 phosphatide1884 ethanoate1892 imino-ester1897 acetylcholine1906 phaeophytin1907 phytic acid1908 propiolactone1917 silicon ester1923 methyl methacrylate1933 Tylose1934 testosterone propionate1937 filicin1941 trichothecin1948 siphonein1949 acetyl coenzyme A1950 acetyl CoA1951 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. < as lemmas |
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