摘要
采用过渡金属催化剂与双氧水逐次处理可溶性淀粉,使用电位滴定法测定了由此法制备的氧化淀粉醛基含量在40%左右,后对该氧化淀粉进行红外图谱扫描及热重分析,进一步证实了试验所得的氧化淀粉中存在一定量的醛基,且热重分析结果证明可溶性淀粉中葡萄糖环的氧化程度均一。最后使用该氧化淀粉对甘氨酰替甘氨酸及明胶进行改性,通过测定处理前后甘氨酰替甘氨酸的核磁共振碳谱、改性前后明胶的粘度及热稳定性的变化探讨了该氧化淀粉对蛋白质的交联性能。结果显示氧化淀粉中新生成的醛基可以与氨基酸的酰胺键发生反应,且经过氧化淀粉处理后的明胶热敏性降低,单独的明胶在30、50℃时的运动粘度分别为19.07、4.13 mm2/s,而改性后明胶粘度分别降至6.40和3.69 mm2/s;催化氧化后得到的氧化淀粉对明胶热稳定性有很大的提高,即原明胶的热变性温度Td仅为122.4℃,改性后则增加到194.0℃。
The metal salt catalytic agent and hydrogen peroxide were chosen to oxidize the soluble starch,and the content of aldehyde group was determined by electrictitration,which was 41.3%.The result of FT-IR and thermogravimetry analysis of oxidized starch also showed the existence of aldehyde group and symmetrical degree of oxidation.At last,the glycyglycine and glutin were treated with the oxidated starch.By testing the carbon nuclear magnetic resonance（13CNMR） spectrograms of native and modified glycyglycine,the kinetic viscosity and denaturation temperature（Td） of the native and treated glutin,it was concluded that oxidated starch could cross link with amido link of protein,and the viscosity of native glutin was 19.07 and 4.13 mm2/s at 30 and 50 ℃ respectively,which was reduced to 6.40 and 3.69 mm2/s for the modified glutin at the same temperature.This also was proved by the fact that the Td of treated glutin was increased to 194.0 ℃ from 122.4 ℃.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2011年第6期213-219,共7页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(21076109)
宁波市自然科学基金资助项目(2009A610109)
