A Proposal for the Expression of the Foamability of Protein Solutions

Mutants exhibiting high catalase activity were derived from Candida boidinii S2 strain AOU-1, from among mutants resistant to H₂O₂, NaN₃ or 3-amino-1,2,4-triazole (ATA). The catalase activity of an ATA-resistant strain was improved by means of a methanol-limited chemostat culture with H₂O₂ supplementation. The catalase activity increased with increasing H₂O₂ concentration in the feed medium in the range where methanol did not remain. Alcohol oxidase activity increased after adaptation of the cells to H₂O₂. Cells of mutant strain SA051 grown under the optimal culture conditions produced 1200 mm formaldehyde in the reaction mixture.