紫外-可见光谱传感对高温大曲白酒真实性的准确鉴别

Accurate Identification of High-temperature Daqu Liquor by UV-Vis Sensor

由于高温大曲白酒品质优良价格高昂,不法商贩常以高档酒瓶灌装同香型低档白酒以次充好。基于4种有机染料与风味化合物竞争配位锌离子的紫外-可见光谱结合偏最小二乘判别分析(PLS-DA)对高温大曲白酒的香型和品牌进行识别和分类。结果表明,风味化合物与锌离子的配位能力大于有机染料与锌离子的配合能力,使得光谱信号变化显著,同香型白酒鉴别的PLS-DA训练集和预测集准确率从原始光谱的98.63%和100%均提高到100%,且传感阵列的鉴别结果总体上是优于单传感点和原始光谱的。因此,基于有机染料与风味化合物竞争配位锌离子的紫外-可见传感方法可用于高温大曲白酒真实性的鉴别分析。

Due to the excellent quality and high price of high-temperature Daqu liquor,unscrupulous traders often adulterate low-grade liquor of the same aroma with high-quality bottles.In this article,the UV-Vis spectral changes caused by the competition coordination of Zn^(2+)between the flavor compounds in liquor and four organic dyes were used in combination with the partial least squares discriminant analysis(PLS-DA).This method was used to identify and classify the aroma and brand of high temperature Daqu liquor.The results showed that the coordination ability of flavor compounds with Zn^(2+)was greater than that of organic dyes,resulting in significant changes in spectral signals.The accuracy of the training set and prediction set of PLS-DA for the same aroma type liquor increased from 98.63%and 100%of the original spectrum to 100%.The identification results of the sensor array were generally better than that of the single sensing point and the original spectrum.Therefore,the UV-Vis sensing method based on the competitive coordination of Zn 2+between organic dyes and flavor compounds could be used for the identification and analysis of high-temperature Daqu liquor.