Laser Photolysis of Carboxymethylated Chitin Derivatives in Aqueous Solution. Part 2. Reaction of OH• and SO4•- Radicals with Carboxymethylated Chitin Derivatives
Authors:
- 9 January 2004
- journal article
- research article
- Published by American Chemical Society (ACS) in Biomacromolecules
- Vol. 5 (2) , 458-462
Abstract
The reactions of OH• or SO4•- radicals with carboxymethyl chitin (CM-chitin) and its deacetylated product, carboxymethyl chitosan (CM-chitosan), were investigated in aqueous solutions using a laser photolysis technique. The rate constants of the reactions of OH• and SO4•- radicals with CM-chitosan are always higher than those for CM-chitin, indicating that the amino-group could increase the reactivity of carboxymethylated chitin derivatives. The rate of the reactions of CM-chitin and CM-chitosan with OH• radical was found to decrease at lower pH when polymers chains tend to the coiled conformation. In comparison, the rate constant of the reaction of SO4•- radicals with CM-chitin or CM-chitosan decreased with pH, indicating that CM-chitin or CM-chitosan has a higher reactivity with the SO4•- radical at low pH due to the protonation of the amino group.Keywords
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