摘要
采用微波法对黄原胶进行降解,考察H2O2用量、降解时间和pH值对降解的影响。用红外光谱对产物结构表征,粘度法测定分子量,并用化学发光法检测降解产物对超氧阴离子自由基O2-的清除活性。结果表明,低分子量的黄原胶具有一定的抗氧化性,且分子量越低,抗氧化性越好。这可能是黄原胶活性基团被暴露所致。
The xanthan gum was degraded by microwave method.The effects of H2O2 concentration,degradation time and pH value on molecular weights of degraded xanthan gum were investigated.The structure of degraded xanthan gum was characterized by infrared spectrum（IR） and the average molecular weights were measured by viscosity method.The scavenging activity of degraded xanthan gum against superoxide anion O2-was evaluated by chemiluminescence method.The results indicated that the xanthan gum with low molecular weight has some oxidation resistance,and the lower the molecular weight is,the higher the oxidation resistance is.It may be related to the exposed active groups of xanthan gum.
出处
《湖南农业科学》
2010年第10期19-21,共3页
Hunan Agricultural Sciences
基金
上海市生物医药和农业科技领域重点科技项目(08391911500)
2009年上海市优秀学科带头人计划(09XD1402000)
上海市教育委员会重点学科建设项目(J50704)
关键词
黄原胶
微波降解
粘度法
超氧阴离子
抗氧化性
xanthan gum
microwave degradation
viscometry
superoxide anion
oxidation resistance
