Food Science and Biotechnology

Korean Society of Food Science and Technology (한국식품과학회)
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Potential of NIR Spectroscopy for Discriminating Geographical Origin of Green Tea from Korea and Japan

Kim, Young-Soo;Scotter, Christopher;Voyiagis, Margaret;Hall, Martin

  • Published : 1997.06.30

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Abstract

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 $1100\sim2500$ nm 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 $1674\sim1686,\;1950\sim1992,\;2014\sim2030\;and\;2118\sim2158\;nm.$ 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.

Keywords

References

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