Fig. 2From: Coupling fermentation of glutamic acid and γ-polyglutamic acid and preparation of poly(amino acid) superabsorbent polymersGlutamic acid content and DCW in glutamic acid fermentation broth (a. before pre-treatment; b. pre-treatment by centrifugation; c. pre-treatment by UV irradiation; d. pre-treatment at 50 °C)Back to article page