Fig. 9From: Coupling fermentation of glutamic acid and γ-polyglutamic acid and preparation of poly(amino acid) superabsorbent polymersFrequency sweep curve of γ-PGA-co-PASP SAPSs (a. PSI:PGA = 1:0; b. PSI:PGA = 2:1; c. PSI:PGA = 1:1, d. PSI:PGA = 1:2).Back to article page