A new enzyme responsible for the oxidation of D-glutamic acid was obtained from the mycelium of Aspergillus ustus strain f isolated from the soil. Many properties of this enzyme in the state of dried cell or crude extract were studied. The enzyme preparation strongly oxidizes D-glutamie-and D-aspartic acids but does not affect any other DL-amino acids at all. A new micro-determination method for D-glutamic acid has been devised by means of this enzyme.
