DEVELOPMENT FOR DISCRIMINATING GEOGRAPHICAL ORIGIN OF GREEN TEA PRODUCTS FROM KOREA AND JAPAN BY NIR SPECTROPHOTOMETER

摘要

A method for determining the place of origin of green tea products by using an NIR spectrophotometer is provided to collect spectrums of different kinds of green tea products, primarily differentiate the spectrum, and find a calibration equation, so that an origin place of the green tea products is determined. 55 green tea products produced in the first country are prepared. 22 green tea products produced in the second country are prepared. The 22 green products are stored at a temperature of -20°C. About 5g of test samples of the green tea products is put into a small ring cup, and scanned by an NIR spectrophotometer, so that spectrums in the range of 400nm to 2500nm are obtained. An experimental reference value is input. The obtained spectrum is primarily differentiated, and a calibration equation is obtained by using MPLS(Modified Partial Least Square), so that the countries of origin of the green tea products are determined.