Studies in the biochemistry of micro-organisms. 95. Rugulosin, a crystalline colouring matter of <i>Penicillium rugulosum</i> Thom

Abstract

Raper & Thom (1949) in their Manual of the Peni- cillia separate species in this genus into four major sections, Monoverticillata, Asymmetrica, Biverti- cillata-Symmetrica and Polyverticillata. They sub- divide each of the sections into a number of series so that the Biverticillata-Symmetrica section, for example, includes six such series among which, for RuGuILosn; Considerable difficulty was experienced in establish- ing the empirical formula for rugulosin. Samples crystallized from ethanol or acetone, in yellow cubes or prisms, and dried to constant weight in high vacuum at 1000 or below, are very hygroscopic.