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[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.