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Citation: XING Rong-E, LIU Song, YU Hua-Hua, GUO Zhan-Yong, WANG Pi-Bo, LI Zhi-En, LI Peng-Cheng. Antioxidant Activity of Chitosans with Different Molecular Weight(DMW) and Chitosan Sulfates[J]. Chinese Journal of Applied Chemistry, ;2005, 22(9): 958-961. shu

Antioxidant Activity of Chitosans with Different Molecular Weight(DMW) and Chitosan Sulfates

XING Rong-E ^a,b ,
LIU Song ^a,b ,
YU Hua-Hua ^a,b ,
GUO Zhan-Yong ^a,b ,
WANG Pi-Bo ^a,b ,
LI Zhi-En ^a ,
LI Peng-Cheng ^a,,

1.
a Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071;
2.
b Graduate School of the Chinese Academy of Sciences, Beijing

Corresponding author: LI Peng-Cheng,
Received Date: 18 November 2004
Available Online: 23 March 2005
Fund Project: 青岛市科技局资助项目(H11022506) (H11022506)

The O₂^·- and ·OH scavenging activities of DMW chitosans and sulfated chitosans of correspon-ding molecular weight were investigated.Colorimetric method was used,by which phenzine methosulphate(PMS)/dinucleotide-reduced(NADH) and Fe/H₂O₂ were used as producing reagent and Nitro blue tetrazo-lium(NBT) and Fanhonghua as detecting reagent for O₂^·- and ·OH.We obtained several satisfied results,as follows:Firstly,low molecular weight chitosans and their derivatives show stronger scavenging effects on O₂^·- and ·OH than high molecular weight chitosan and their derivatives.For example,when the mass concentration of samples is 1.6 g/L,the O₂^·- scavenging activity of low molecular weight chitosan(9×10³) and high molecular weight chitosan(7.6×10⁵) are 85.86% and 35.50% respectively.Secondly,compared with DMW chitosans,DMW sulfated chitosans show stronger inhibition effect on O₂^·-.At 0.05 g/L,the scavenging activity on O₂^·- reaches to 86.26% for low molecular weight chitosan sulfate(9×10⁵),but that of low molecular) weight chitosan(9×10³) is 85.86% when mass concentration of the sample is 1.6 g/L.Thirdly,scavenging activity of chitosan sulfates(9×10³,89.82%,1.2×10⁵,59.68%,3.2 g/L) on OH is between those of low molecular weight chitosan(9×10³,91.22%,3.2 g/L) and high molecular weight chitosan(1.2×10⁵,44.11%,7.6×10⁵,16.77%,3.2 g/L).Fourthly,low molecular weight chitosan sulfates show more effective scavenging activities on O₂^·- and ·OH than high molecular weight chitosan sulfates.Finally,the scavenging activities of DMW chitosan and their sulfated derivatives increase with the increase in their mass concentration.However,sulfated chitosans show quite strong scavenging action on O₂^·-.At 0.2 g/L,the scavenging activities reach to 95.87% and 91.96% respectively,but their scavenging activities barely increase over 0.2 g/L.This result also shows sulfated chitosans are very effective antioxidant.
- chitosan,
- sulfated chitosan,
- superoxide radical,
- hydroxyl radical,
- antioxidant activity
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