Citation:
LI Xiao-Xia, XU Ai-Hua, XIE Wei-Yang, MA Xiao-Jun. Oxidative Degradation of Alginate by Hydrogen Peroxide[J]. Chinese Journal of Applied Chemistry,
;2009, 26(6): 625-628.
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The clean and effective oxidant,hydrogen peroxide,was used to degrade alginate in order to prepare its low molecular products,and the effects of pH,temperature,amount of H2O2 and metal ions on the degradation were investigated.The degradation rate increased with the decrease of solution pH,and the increases of reaction temperature and oxidant dosage.Low molecular alginate could be obtained effectively with pH of 5.3,temperature of 50 ℃ and H2O2 of 0.5% for 2 h reaction.The reaction could be also significantly accelerated by 4 mg/L Cu2+ or Fe2+.GPC analysis showed that the average molecular mass of alginate was decreased and the molecular mass distribution was broadened.It can be inferred from FTIR that the degradation was caused by OH radicals produced by hydrogen peroxide,which resulted in the breakage of the glycosidic C(1)—O—C(4) bond.
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Keywords:
- alginate,
- hydrogen peroxide,
- oxidation,
- degradation
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