双氧水氧化马铃薯淀粉最佳工艺条件及其特性的研究

STUDY ON OPTIMAL CONDITIONS AND PROPERTIES OF POTATO OXIDIZED STARCH TREATED BY HYDROGEN PEROXIDE

以马铃薯淀粉为原料,H2O2为氧化剂,Fe2+为催化剂,采用湿法工艺制备氧化淀粉.通过正交实验考察反应体系的pH值、双氧水的用量、催化剂的用量、反应温度和反应时间对氧化淀粉羧基含量的影响,并用红外吸收光谱确定产品中羧基的存在.结果表明:在pH=7.8,催化剂用量0.032%,H2O2用量8%,反应温度在46.0℃,反应时间4.0 h条件下,可以制得羧基含量为0.33%的氧化淀粉.通过对不同羧基含量产品的透明度和凝沉性研究发现:氧化淀粉的透光率随羧基含量的增加而增加,可用公式定量y=99.97-21.35exp(-x0.2)表示,相反,马铃薯氧化淀粉凝沉性随着羧基含量的增加而降低.当羧基含量达到0.33%时,糊透光率可达到98%,产品6 d内不凝沉.

Potato starch was used as material to prepare oxidized starch by wet technology where hydrogen peroxide was used as oxidant and Fe2＋ as catalyst.The effects of pH of reaction system,quantity of the catalyst,amount of the hydrogen peroxide,temperature and time on carboxyl content of oxidized starch were studied.Single factor analysis was used to determine the range of influencing factors,on the base of which orthogonal experiment was made to analyze and validate the results.The results showed that with pH 7.8,catalyst 0.032%,hydrogen peroxide 8%,temperature at 46.0 ℃,and time 4.0 h,oxidized starch with carboxyl content of 0.33% can be obtained.The transparency and retrogradation of oxidized starch with different carboxyl contents were studied.The results showed that with the carboxyl content increasing,the transparency percentage of samples increased,which can be described by a formulation,conversely,their retrogradation decreased.As the carboxyl contents of the sample reached 0.33%,transparency percentage reached 98%,and the sample did not retrogradate within 6 days.Infrared absorption spectroscopy was used to confirm the existence of carboxyl after oxidation.