芝麻香型白酒中3-甲硫基丙醇的GC-FPD检测方法研究

建立了一种高灵敏和高选择性检测芝麻香型白酒中3-甲硫基丙醇的气相色谱法。为解决传统检测方法（GC-FID法）灵敏度低、选择性差、对色谱条件要求苛刻的问题，利用火焰光度检测器（FPD）（配有硫滤光片）对含硫化合物具有特异性响应的特性，建立了一种简便、快捷、选择性的检测酒中3-甲硫基丙醇的方法（GC-FPD法）。结果表明，在3-甲硫基丙醇质量浓度为0.1～10.0 mg/L范围内，线性回归方程为y=583 476.1x2+1 648 312x-310 670.0，相关系数为0.999 9；检出限0.03 mg/L，定量限0.1 mg/L。加标回收率试验结果的平均回收率为93.1%～104.6%，日内精密度相对标准偏差（RSD1）为3.2%～4.9%，日间精密度相对标准偏差（RSD2）为1.1%～2.1%。该方法准确度及精密度良好，能够满足白酒中3-甲硫基丙醇的检测要求。

Detection of 3-methylthio propanol in sesame-flavor Baijiu by GC-FPD method

A highly sensitive and selective gas chromatographic method for the determination of 3-methylthio propanol in sesame-flavor Baijiu (Chinese liquor) was developed. In order to solve the traditional GC-FID detection method of low sensitivity, poor selectivity, and chromatographic conditions demanding, a simple, fast and high selective GC-FPD method for detecting 3-methylthio propanol was established using flame photometric detector (equipped with a S filter) with the specific response of sulfur compounds. The results showed that: in the range of 3-methylthio propanol concentration 0.1-10.0 mg/L, the linear regression equation was: y=583 476.1x2+1 648 312x-310 670.0, the correlation coefficient was 0.999 9, the detection limit was 0.03 mg/L, and the limit of quantitation was 0.1 mg/L. The average recovery rate of the test was 93.1%-104.6%, the relative standard deviation of within day precision (RSD1) was 3.2%-4.9%, inter day precision (RSD2) was 1.1%-2.1%. The method had good accuracy and precision, which can meet the requirement of 3-methylthiol propano determination in sesame-flavor Baijiu.