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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. shu

Oxidative Degradation of Alginate by Hydrogen Peroxide

LI Xiao-Xia ^a,b ,
XU Ai-Hua ^a,b ,
XIE Wei-Yang ^a ,
MA Xiao-Jun ^a,,

1.
a Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023;
2.
b Graduate School of the Chinese Academy of Sciences, Beijing

Corresponding author: MA Xiao-Jun,
Received Date: 10 June 2008
Available Online: 1 September 2008
Fund Project: 国家科技部“九七三”项目(2007CB714305) (2007CB714305)国家自然科学基金重点资助项目(20736006) (20736006)

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.
- alginate,
- hydrogen peroxide,
- oxidation,
- degradation
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