Aggregation of some water-soluble derivatives of chitin in aqueous solutions: Role of the degree of acetylation and effect of hydrogen bond breakerстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:By dynamic light scattering in combination with fluorescence
spectroscopy and TEM it was shown that aggregation in aqueous solutions
is inherent not only to chitosan, but also to two other water-soluble
derivatives of chitin: O-carboxymethylchitin and
di-N,N-carboxymethylchitosan. Aggregation is observed even for the
samples without N-acetyl-D-glucosamine units, which remain upon
incomplete chemical modification of chitin, indicating that specific
interactions between residual chitin repeat units cannot be the main
reason for the aggregation. At the same time, 7 M urea weakens the
aggregation, thus testifying that hydrogen bonding and/or hydrophobic
interactions are partially responsible for this phenomenon. The
incomplete disruption of aggregates in 7 M urea may arise from
crystallization of junction zones between different macromolecules,
which makes some hydrogen bonds inaccessible for urea or too stable for
breaking by this agent. (C) 2011 Elsevier Ltd. All rights reserved.