近红外透射光谱应用于黄酒酒龄的定性分析

应用近红外光谱透射技术,结合化学计量学方法,开展了黄酒酒龄定性鉴别的研究,并对不同光谱预处理方法(未处理、平滑、二阶微分)对酒龄鉴别结果的影响进行了对比分析.试验采用傅里叶变换近红外光谱仪,以86瓶绍兴黄酒为标准样品,并结合不同光谱预处理方法及判别分析法,建立了黄酒酒龄定性鉴别模型.光谱平滑处理对酒龄鉴别结果影响不显著,而微分光谱分析结果最差,近红外原始光谱结合判别分析法的分析结果最优,其校正集正确分类的百分比达98.1%,预测集达90.6%.研究表明,近红外光谱透射技术结合原始光谱及判别分析法可作为一种可靠、准确、快速的检测方法用于黄酒酒龄定性鉴别分析.

Qualitative Analysis of Chinese Rice Wine with Different Marked Age by Near Infrared Transmission Spectroscopy

The feasibility of using near infrared transmission spectroscopy for classification of Chinese rice wine with different marked age was presented in the present research. The prediction performance of different preprocessing methods of the spectra (raw spectra, smoothed spectra and derivative spectra) together with discriminant analysis (DA) was also investigated. A total of 86 Shaoxing rice wines were tested in the wavelength of range 800-2 500 nm using Fourier transform near infrared spectroscopy. The results of the research indicated that the performance of second derivative spectra was the worst, and the results from raw spectra were the best, with the percentage of samples correctly classified 98.1% and 90.6% for the calibration and validation set, respectively, and the smoothed spectra had no influence on the classification results. The results indicated that near infrared transmission spectroscopy in conjunction with DA was a powerful tool for discriminating Chinese rice wines with different marked ages.