| 释义 |
parietin Chem. and Bot.|pəˈraɪɪtɪn|
[f. L. parietinus of or belonging to walls (f. pariēs, pariet- wall), in the fem. a specific epithet of the lichen Xanthoria parietina from which the compound was obtained; see -in1.]
An anthraquinone derivative present as an orange-yellow pigment in some lichens; 1:8-dihydroxy-3-methoxy-6-methylanthraquinone, C16H12O5.
1844R. D. Thomson in Proc. Philos. Soc. Glasgow I. ix. 187, I have succeeded in obtaining the colouring matter, or Parietin, as I propose to term it, in the form of needles. 1894Jrnl. Chem. Soc. LXVI. i. 541 The colouring matter..may be extracted by means of benzene without destroying the lichen. It crystallises in small, golden-yellow needles which are soluble in alkalis with blood-red coloration... The authors consider this colouring matter to be a dihydroxyanthraquinone, and propose for it the name chrysophyscin... The colouring matter was termed parietin by Thomsen [sic]. 1921A. L. Smith Handbk. Brit. Lichens 44 The species [of Xanthoria] grow most freely in maritime districts, and are bright-yellow in the open where the acid substance parietin..is freely formed. Ibid., Parietin is produced in more or less abundance in the thallus of most species [of Placodium], and in the apothecia of all except Pl. repellens which is probably an impoverished form. 1966New Phytologist LXV. 211 Unlike the species of Peltigera, those of Xanthoria are relatively rich in ‘lichen acids’ such as parietin and atranorin. 1967M. E. Hale Biol. Lichens viii. 105 The following four pigments are also common to non-lichenized fungi: endocrocin and parietin, both anthraquinones, and polyporic and thelephoric acids, both terphenylquinones. |