Fig. 3From: Coupling fermentation of glutamic acid and γ-polyglutamic acid and preparation of poly(amino acid) superabsorbent polymersChanges in various indicators during the fermentation process of polyglutamic acid. (a) Variation of γ-PGA content with time; (b) Variation of glutamic acid content with fermentation time; (c) Variation of DCW with fermentation timeBack to article page