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KMID : 0380620090410030292
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Korean Journal of Food Science and Technology
2009 Volume.41 No. 3 p.292 ~ p.295
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The Geographical Discrimination of Korean and Chinese Soybeans(Glycine max(L.) merrill) Using NMR Relaxation Methods
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Kim Mi-Hyun
Rho Jeong-Hae
Lee Cheol-Ho
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Abstract
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To discriminate the geographical origin (Korea vs. China) of soybean (Glycine max(L.) merrill) samples(Korean samples n=25, Chinese samples n=24), proximate composition of soybeans and relaxation times were analyzedusing low field NMR. Composition results indicate that there are no significant differences in moisture, fat, or ash contentsbetween soybeans. The crude protein content of Korean soybeans, however, was higher than that of Chinese soybeans(p<0.05). The relaxation times of T1-IR (p<0.0001), T1-SR (p<0.0001), and T2-SE (p<0.0086) in Korean soybeans werelonger than those in Chinese soybeans. The geographical origin of soybeans could be identified using a canonicaldiscriminant analysis using two relaxation times (T1-IR and T1-SR) with 96% accuracy. Furthermore, in this study, acanonical discriminant analysis using four relaxation times (T1-IR, T1-SR, T2-SE, and T2-CPMG) could discriminate thegeographical origin with 100% accuracy. It was possible to identify the geographical origin of Korean and Chinesesoybeans using relaxation times from 10 MHz NMR.
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KEYWORD
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NMR, soybean, discrimination, relaxation
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