中文摘要：

采用在线质谱法,在无需样品预处理的条件下,建立快速检测酒中乙酸乙酯、丁酸乙酯、乳酸乙酯、戊酸乙酯、己酸乙酯5种常见乙酯的方法。5种乙酯在0.5～20 mg/L内线性关系良好（R^2〉0.99）,2个加标水平（0.5、5 mg/L）的回收率为81.1%～99.7%,相对标准偏差为4.7%～9.4%,检出限为24～312μg/L。对市场上消费的蒸馏酒（中国白酒、白兰地、金酒及威士忌）进行检测分析,同种类蒸馏酒检出的主要成分及其比例基本一致,中国白酒、威士忌和白兰地均不同程度地检出乙酯。同时,结合主成分分析可对不同品种的蒸馏酒进行较好的区分。

英文摘要：

A rapid method was developed for the determination of 5 common ethyl esters,ethyl acetate,ethyl butyrate,ethyl lactate,ethyl valerate and ethyl caproate,in liquor without any sample pretreatment using on-line mass spectrometry.Reasonable linearity was achieved for all the analytes over the range of 0.5–20 mg/L with correlation coefficients（R^2） greater than 0.99.The recoveries for five ethyl esters at two spiked levels were in the range from 81.1% to 99.7% with relative standard deviations（RSDs） of 4.7%-9.4%.The limits of detection（LODs） of the method ranged from 24 to 312 μg/L.Under optimized conditions,four kinds of distilled spirits marketed in China were analyzed,such as Chinese liquor,brandy,Dry Gin and whiskies.The main ester components and their contents in the same kind of distilled spirit were basically the same while ethyl esters were determined at different levels in Chinese liquor,brandy and whiskies.Meanwhile,the four kinds of distilled spirits could be distinguished accurately using principal component analysis.