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Depolymerization of Alginates by Hydrogen Peroxide/Ultrasonic Irradiation  

Choi, Su-Kyoung (Department of Chemical Engineering, Chosun University)
Choi, Yoo-Sung (Department of Bioenvironmental & Chemical Engineering, Chosun College University of Science & Technology)
Publication Information
Polymer(Korea) / v.35, no.5, 2011 , pp. 444-450 More about this Journal
Abstract
A high molecular weight natural sodium alginate (HMWSAs) was depolymerized by hydrogen peroxide ($H_2O_2$) with ultrasonic irradiation. The effects of the reaction conditions such as reaction temperature, reaction time, hydrogen peroxide concentration and ultrasonic irradiation time on the molecular weights and the end groups of the depolymerized alginates were investigated. It was revealed that depolymerization occurred through the breakage of 1,4-glycosidic bonds of sodium alginate and the formation of formate groups on the main chain under certain conditions. The changes in molecular weight were monitored by GPC-MALS. The molecular weight of 2 wt% alginate solution decreased from 450 to 15.9 kDa for 0.5 hrs at 50 $^{\circ}C$ under an appropriate ultrasonic irradiation. The PDI(polydispersity index)s of the alginate depolymerized in this study were considerably narrow in comparison with those obtained from the other chemical degradation method. The PDIs were in the range of 1.5~2.5 in any reaction conditions employed in this study.
Keywords
hydrogen peroxide; ultrasound; oxidation; low molecular weight sodium alginate;
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