Studies in the biochemistry of micro-organisms

GOULD & RAISTRICK [1934] reported the isolation of three new crystalline colouring matters which they obtained by extraction with light petroleum of the dried mycelium of 25 species in the Aspergillus glaucus series. The colouring matters and the empirical formulae provisionally assigned to them were: (a) flavoglaucin, C1,H2803, lemon-yellow needles; (b) auroglaucin, C1,H2203, orange-red needles; (c) rubroglaucin, C16HL205, ruby-red needles. Further investigation of these colouring matters has confirmed the views expressed by Gould & Raistrick in the cases of flavoglaucin and auroglaucin and provisional structural formulae have now been assigned to them [Raistrick et al. 1937;