脱氢枞酰甲壳低聚糖的合成

以脱氢松香中分离得到的脱氢枞酸为原料，经酰氯化生成脱氢枞酰氯后，再与壳聚糖的氧化降解产物甲壳低聚糖作用，得到以脱氢枞酰基为亲油基和多聚氨基葡萄糖单元为亲水基的生物表面活性剂；用FT—IR等方法表征了产物结构，元素分析法测定了产物的取代度。结果表明，当以甲烷磺酸-DMSO为反应介质、脱氢枞酸对氨基葡萄糖单元的摩尔比为2．0时，酰化反应主要发生在壳寡糖的伯羟基上，且产物的取代度为15．43％。

Synthesis of Dehydroabietyl Chitooligosaccharide

Dehydroabietic acid, which was obtained from dehydrogenated rosin, was reacted with thionyl chloride and transformed into dehydroabietic acid chloride. Meanwhile, chitosan was degraded into chitooligosaccharide through oxidation. Dehydroabietyl chitooligosaccharide, a bio - surfactant with dehydroabietyl group as hydrophobic group and poly - aminoglucose unit as hydro- philic group, was obtained through the reaction between chitooligosaccharide and dehydroabietic acid chloride. The product＇ structure was characterized by FT - IR, and the degree of substitution （DS） was ascertained by elemental analysis. When the MeSO3 H - DMSO was utilized as reaction medium and the mass ratio of dehydroabietic acid versus aminoglucose unit was 2.0, results indicated that the DS was 15.43%. FT- IR spectra showed that the substitution reaction was mainly occurred in the primary hydroxyl group.