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KMID : 1007519970060020074
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Food Science and Biotechnology
1997 Volume.6 No. 2 p.74 ~ p.78
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Potential of NIR Spectroscopy for Discriminating Geographical Origin of Green Tea from Korea and Japan
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Kim, Young Soo
Scotter, Christopher/Voyiagis, Margaret/Hall, Martin
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Abstract
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A total of 47 samples of powdered Korean and Japanese green tea were scanned by NIR spectroscopy and principal component and canonical variate analysis were applied to the spectral data to investigate the possibility of NIR spectroscopy as a tool to discriminate the country of origin. First and second canonical variates generated from first derivative log (1/R) data for the 1100∼2500 ㎚ range by using 15 principal components was the most effective way to discriminate the country of origin for Korean and Japanese green tea. 97.87% of calibration samples were classified correctly. Substantial differences in the first derivative spectra between Japanese green tea and 3 types of Korean green tea were found in the wavelength bands 1674∼1686, 1950∼1992, 2014∼2030 and 2118∼2158 ㎚. It is thought that the differences are not associated with major components such as polyphenols, caffeine and amino acids but associated with different geographical origin and/or processing method.
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KEYWORD
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