Fig. 4: PA influences the gelation properties of chitosans. | Nature Communications

Fig. 4: PA influences the gelation properties of chitosans.

From: Biotechnologically produced chitosans with nonrandom acetylation patterns differ from conventional chitosans in properties and activities

Fig. 4

A Dependence of the viscoelastic moduli G’ and G” and of the complex viscosity (η*) on frequency for CS.33E-Ac (left panel) and CS.30 N-Ac (right panel) (strain 5%, 40 °C) in 0.5 M acetate buffer pH 4.5 (ca. 14 mg mL−1 chitosan) crosslinked with genipin (genipin/GlcN molar ratio = 0.5). B Cox-Merz superpositions of steady-shear viscosity (η) and complex viscosity (η*) for CS.33E-Ac (left panel) and CS.30 N-Ac (right panel). C Dependence of the viscoelastic moduli G’ and G” and of the liquid-like character (tan δ) on time for CS.33E-Ac (left panel) and CS.30 N-Ac (right panel) (strain 5%, 40 °C) in 0.5 M acetate buffer pH 4.5 (ca. 14 mg mL−1 chitosan) crosslinked with genipin (genipin/GlcN molar ratio = 0.5). D Multiwave variation of tan δ(t) at the fundamental and multiwave harmonic frequencies (as shown in labels), showing the closest earliest crossover time for CS.33E-Ac (left panel) and the critical gel time (tgel) for CS.30 N-Ac (right panel). E Endpoint (time 6000 s) dependence of the viscoelastic moduli G’ and G” and of the complex viscosity (η*) on frequency for CS.33E-Ac (left panel) and CS.30 N-Ac (right panel).

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