M.E. Morgan

Esters Produced by Chalaropsis thielavioides

Chalaropsis thielavioides, a filamnentous fungus. produces a characteristic ester-like aroma on potato dextrose broth. By gas-liquid chromatographic techniques, the major aroma-producing substances have been identified as isobutyl and ethyl acetate. Lesser amounts of isoamyl acetate, ethanol, and methanol were also present.

Alpha-Keto Acids in Vitamin-Free Casein Hydrolyzates (Acid)

α-Ketoglutaric and pyruvic acids were isolated as their 2-4-dinitrophenylhydrazones from five different commercial samples of vitamin-free acid hydrolyzates of casein. In addition, one sample yielded traces of α-ketobutyric acid. The hydrazones were converted by hydrogenation to glutamic acid, alanine, and α-aminobutyric acid and identified by paper chromatography.