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中文摘要：
摘要以油酸和糖（麦芽糖、葡萄糖、山梨醇和木糖醇）为原料，在脂肪酶（Novzyme435）的催化下，合成了4种油酸糖酯。通过IR和Ms对产品进行了表征。对所合成的油酸糖酯进行了表面性能（CMC、表面张力、HLB值，乳化性和乳化稳定性）测定。试验结果表明油酸：糖为（1-1．5）：1（物质的量比），脂肪酶用量为0．30～0．36g／mol油酸，溶剂（丙酮）用量为10～20mL／mol油酸，回流反应42～72h，油酸的转化率为89％-95％。IR显示产品为酯，MS显示产品分别为：油酸麦芽糖酯，油酸葡萄糖酯，油酸山梨醇酯，油酸木糖醇酯。4种油酸糖酯都具有良好的表面活性，其临界胶束浓度为（CMC）7．94×10-43．98×10^-5mol·L-1；HLB值6．8—13．0，它们都具有很好的乳化性能，可用作O／W和W／O型乳化剂。
英文摘要：
Four kinds of oleic acid sugar esters were respectively synthesized with sugar （maltose, glucose, sor- bitol and xylitol） and acid as raw materials, and with lipase （ Novzyme 435 ） as catalyst. The structures of product were represented by IR and MS. Surface performances （CMC, surface tension, HLB value, emulsification and emul- sion stability） of of the synthesized oleic acid sugar esters were determined. The test results show that： when the ratio of oleic acid and sugar is 1 - 1.5：1 （mol： mol）, the dosage of lipase （Novzyme 435） is 0.30 -0.36 g/tool oleic acid, the dosage of solvent （acetone） for 10 -20 mL/mol oleic acid, and the reflux reaction is for 42 -72 h, the conversion rate of oleic acid reaches 89% -95%. IR showed that the product was ester; while MS showed that the products were oleic acid maltose ester, oleic acid glucose ester, oleic acid sorbitol ester and oleic acid xylitol ester re- spectively, all of the four kinds of oleic acid sugar esters have good surface activity. The critical micelle concentra- tions （CMC） were 7.9410 - 4 - 3. 9810 - 5molL - 1. Due to the HLB value of 6.8 ~ 13.0, they all have good emul- sifying properties and can be used as W/O and O/W types of emulsifiers.
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