Abstract
The dynamics of chitosan (CS) in solution have been studied by (1)H NMR relaxation [longitudinal (T(1)) and transverse (T(2)) relaxation times and NOE] as a function of the degrees of acetylation (DA, 1-70) and polymerization (DP, 10-1200), temperature (278-343 K), concentration (0.1-30 g/L), and ionic strength (50-400 mM). This analysis points to CS as a semirigid polymer with increased flexibility at higher DA in agreement with reduced electrostatic repulsions between protonated amino groups.
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