摘要
将天然κ-卡拉胶降解至数均分子量为10 000,并制成四丁基铵盐,用水杨酸对其改性,合成O-水杨酰基低分子量κ-卡拉胶.UV、FT-IR、1H NMR和13C NMR的测试分析结果表明:水杨酸与κ-卡拉胶结构单元中G4S上6位羟基反应生成单酯,产物的酰化取代度为0.69.体外抗氧化活性测定结果表明:水杨酸的改性能够有效地提高抗氧化活性.
Low molecular weight（LMW） K-carrageenan with the number-average molecular weight of 10000 was achieved by depolymerizing natural K-carrageenan in mild hydrochloric acid condition, and then was turned into tetrabutylammonium salt. O-salicyloyl LMW κ-carrageenan was obtained by the salt modified with salicylic acid. The fine structure of O-salicyloyl LMW κ-carrageenan was characterized by 1H NMR, ^13C NMR, IR and UV. The results indicated that salicylic acid was reacted with the Hydroxyl groups on G4S 6 of κ-carrageenan and formed the O-salicyloyl LMW κ-carrageenan. The degree of acylation was worked out to be 0.69. Meanwhile, modifying κ-carrageenan with salicylic acid could improve its antioxidative activity in vitro.
出处
《汕头大学学报（自然科学版）》
2008年第3期51-57,62,共8页
Journal of Shantou University：Natural Science Edition
基金
国家自然科学基金资助项目(50677014)
国家863计划资助项目(2006AA04A104)
高校博士点基金资助项目(20060532002)
