马铃薯淀粉氧化工艺优化研究
Study on the optimization research of potato starch oxidation
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摘要: 以芬顿试剂为氧化剂氧化马铃薯淀粉,研究pH、氧化温度、氧化时间、30%H2O2用量和FeSO4用量等单因素对氧化淀粉中羧基含量的影响。在此基础上,采用Box-Behnken优化淀粉氧化工艺条件,建立并分析了各因素与含量关系的数学模型。单因素实验结果表明氧化时间4h,30%H2O2用量为25mL,pH10,温度为50℃,FeSO4用量0.3g。响应曲面分析得到在30%H2O2用量为25mL,pH=10和氧化温度为50℃的条件下,氧化淀粉中羧基含量为1.4590%,与理论值1.4699%接近。说明回归模型能较好的预测氧化淀粉中羧基含量。SEM表明淀粉颗粒经过芬顿试剂氧化后表面出现孔洞;IR表明有羧基的特征吸收峰出现。Abstract: With Fenton reagent as oxidant to oxidize potato starch, the effect of pH, oxidized temperature, oxidized time, 30% H2O2dosage, FeSO4dosage on carboxyl content in oxidized starch were studied.Based on single factors experiments, the oxidation technology of potato starch was optimized through Box-Behnken, built and analyzed a mathematical model of the relationship between factors and content.Results showed that with the condition of 30% H2O2dosage of 25mL, pH 10 and oxidation temperature of 50℃, oxidized starch had 1.4590% carboxyl content, which was close to theoretical value of 1.4699%.It explained that regression model could precast carboxyl content of oxidized starch better.There were some holes on the surface of starch granule after oxidation through SEM.And carboxyl characteristic absorption peak was proved to exist by IR.
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