Chemical and Functional Properties of Food Saccharides

© 2004 by CRC Press LLC
FIGURE 14.4 Titration curves of chitosans monitored by 1 H NMR. The chemical shifts
differences between H-2 of D-units and the internal reference sodium-(trimethylsilyl)-propionate-d
4 (TSP) as a function of pH for chitosan. : F A = 0.01, _: F A = 0.13, and : F A = 0.49.
Solid lines indicate logistic regression. (From Strand, S.P. et al., Biomacromolecules, 2, 1310,
2001. With permission.)
FIGURE 14.5 Degradation rate constants (k) as a function of F A of chitosans, determined by
the viscosity assay at a chitosan concentration of 1.5 mg/ml in 0.4 M HCl at 60∞C. (From
Vårum, K.M., Ottøy, M.H., and Smidsrød, O., Acid hydrolysis of chitosans, Carbohydr.
Polym., 46, 89, 2001. With permission).