Izmir Institute of Technology, Department of Food Engineering, Urla, Izmir, Turkey.
Food Chem. 2013 Nov 15;141(2):1461-5. doi: 10.1016/j.foodchem.2013.04.015. Epub 2013 Apr 20.
Consumption of traditional aniseed alcoholic beverage, raki, adulterated with methanol results in deaths, therefore, its detection is an important issue. In this study, mid-infrared spectra of pure and methanol adulterated (0.5-10% (vol/vol)) raki samples were collected with an attenuated total reflectance attachment of a Fourier-transform infrared spectrometer. Principal component analysis was used to discriminate pure and adulterated raki samples, then, a partial least square model was constructed to determine the adulterant methanol content in raki using mid-IR spectral data. A minimum threshold level of 0.5% methanol in raki samples was successfully detected. A good prediction model for determination of methanol adulteration ratio in raki samples was also constructed (R(2)=0.98 and RPD=8.35).
饮用掺入甲醇的传统八角酒精饮料——茴香酒，会导致死亡，因此，检测茴香酒中是否掺有甲醇是一个重要问题。本研究采用傅里叶变换红外光谱仪的衰减全反射附件，采集了纯茴香酒和甲醇（0.5-10%（体积/体积））掺杂茴香酒的中红外光谱。主成分分析用于区分纯茴香酒和掺杂茴香酒样品，然后，构建了一个偏最小二乘模型，利用中红外光谱数据来确定茴香酒中掺杂的甲醇含量。成功检测到茴香酒中甲醇的最低阈值水平为 0.5%。还构建了一个用于确定茴香酒中甲醇掺杂比例的良好预测模型（R(2)=0.98 和 RPD=8.35）。
