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中文摘要：
将天然κ-卡拉胶降解至数均分子量为10000，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、^1HNMR和^13CNMR的测试分析结果表明：水杨酸与κ-卡拉胶结构单元中CAS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．
英文摘要：
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.
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