Novoa-Carballal R, Fernandez-Megia E, Riguera R. Dynamics of chitosan by (1)h NMR relaxation.
Biomacromolecules 2010;
11:2079-86. [PMID:
20593894 DOI:
10.1021/bm100447f]
[Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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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