气相色谱-质谱法测定豉香型白酒中β-苯乙醇及3种二元羧酸的二乙酯

GC-MS Determination of β-Phenylethanol and Diethyl Esters of Three Dicarboxylic Acids in"Chi"-Flavoured White Spirit

用2-乙基正丁酸为内标物,提出用气相色谱-质谱联用全扫描法测定豉香型白酒中β-苯乙醇和在特定保留时间窗内选择性离子法测定庚二酸二乙酯、辛二酸二乙酯和壬二酸二乙酯含量。此方法对β-苯乙醇的检出限(S/N=3)为5.0mg·L^(-1),对其他3种二元羧酸的二乙酯的检出限均为0.01mg·L^(-1),测得方法的回收率在90%～110%之间,相对标准偏差(n=10)均小于9%。

Gas chromatography in hyphenation with mass spectrometry （GC-MS） was applied to the determination of β-phenylethanol and diethyl esters of three dicarboxylic acids, namely diethyl heptanedioate, diethyl octanedioate and diethyl nonanedioate, in ＂Chi＂-flavoured white spirit. In the GC-MS analysis, 2-ethyl-butanoic acid was used as internal standard, and full scanning method was used for determination of β-phenylethanol and selective ion monitoring mode was used for determination of diethylesters at difinite retention time. Detection limit （S/N= 3） of the method were found to be 5. 0 mg· L^-1 for β-phenylethanol, and 0. 01 mg· L^-1 for all the 3 diethyl esters. Values of recovery obtained were in the range of 90%--110%, and values of RSD＇s （n= 10） were less than 9 %.