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Citric acid production from cellulose hydrolysate was done by a semi-solid culture of Aspergillus niger Yang no. 2, a parental strain, and C192, which is a 2-deoxy-d-glucose-resistant mutant strain. Cellulose powder was hydrolyzed to mainly glucose and a low concentration of cellobiose by a commercial cellulase in acetate or citrate buffer. The hydrolysate prepared in acetate buffer was concentrated...
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