Studies in the biochemistry of micro-organisms. 81. The colouring matters of Penicillium islandicum Sopp. Part 2. Chrysophanic acid, 4:5-dihydroxy-2-methylanthraquinone

Abstract

The coloring matters present in the mycelium of a strain of P. islandicum, which, though morphologically typical, appears to be biochemically atypical, have been examined. One of these coloring matters was identified as chrysophanic acid (chrysophanol), 4,5-dihydroxy-2-methylanthraquinone. Eleven other fungal coloring matters, the molecular structures of which are known, are shown to be derivatives of chrysophanic acid. l,4,5-Trihydroxy-2-methylanthraquinone, previously isolated from 5 other strains of P. islandicum but absent from the present strain, was named islandicin.[long dash]Auth. summ.