Isolation of Citreoviridin from Penicillium charlesii Cultures

Occurrence of Penicillium brocae and Penicillium citreonigrum, which Produce a Mutagenic Metabolite and a Mycotoxin Citreoviridin, Respectively, in Selected Commercially Available Rice Grains in Thailand

Commercially available rice grains in Thailand were examined to isolate the monoverticillate Penicillium species responsible for toxic yellowed rice. Penicillium species were obtained from seven out of 10 rice samples tested. Among them, one Penicillium citreonigrum isolate and six Penicillium brocae isolates were morphologically identified. The P. citreonigrum isolate produced the mycotoxin ci...

Tetronic acid biosynthesis in molds. I. Formation of carlosic and carolic acids in Penicillium charlesii.

The tetronic acid structure not only appears in the vitamin, n-ascorbic acid, but in addition is frequently found in natural products. A group of related tetronic acids was identified by Raistrick and his colleagues (1, 2) in Penicillium charlesii and some other molds. The interrelationships among the structures of these acids are indicated in Fig. 1. It was of interest to determine the pathway...

Lxxxvi. Polysaccharides Synthesised by Micro-organisms Iii. the Molecular Structure of Galacto- Carolose Produced from Glucose by Penicillium

Clviii. Studies in the Biochemistry of Micro-organisms. Xlv. the Metabolic Products of Penicillium

IT was recently shown [Clutterbuck et al., 1934] that Penicillium Charlesii G. Smith, when grown on nutrient solutions containing glucose, produces two new polysaccharides, mannocarolose [Haworth et al., 1935] and galactocarolose, together with a number of new organic acids. The polysaccharides were isolated by precipitation from the evaporated metabolism solution with acetone, and the acids by...

Studies on the biochemistry of Penicillium charlesii. Influence of various dicarboxylic acids on galactocarolose synthesis.

1. It has been shown that Penicillium charlesii continues to synthesize galactocarolose when l-malic acid, malonic acid, succinic acid, fumaric acid, maleic acid or oxaloglycollic acid is substituted for dl-tartaric acid in the Raulin-Thom nutrient medium. 2. The quantity of galactocarolose synthesized per g. of mycelia was markedly decreased by substitution of l-malic acid, malonic acid, succi...