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Discriminating Domestic Soybeans from Imported Soybeans by 20 MHz Pulsed NMR  

Rho, Jeong-Hae (Korea Food Research Institute)
Lee, Sun-Min (Korea Food Research Institute)
Kim, Young-Boong (Korea Food Research Institute)
Lee, Taek-Soo (Department of Food and Microbial Technology, Seoul Women's University)
Publication Information
Korean Journal of Food Science and Technology / v.35, no.4, 2003 , pp. 653-659 More about this Journal
Abstract
A 20 MHz pulsed NMR systems was employed to discriminate the geographical origin of soybeans and black beans (yak-kong) from Korea and foreign countries. Crude fat contents measured by soxhlet method were significantly (p<0.05) different between domestic and imported soybeans. Moisture and crude protein contents, measured by AOAC, were significantly different between domestic and imported black beans. In soybeans, values by solid fat content method and Carr-Purcell-Meiboom-Gill (CPMG) method using 20 MHz pulsed NMR showed the significant difference among soybeans from various the geographical origins. In black beans (yak-kong), NMR values measured by NMR except $T_1$ SR pulse sequence revealed the significant difference by the geographical origins. The habitat of soybeans and black beans could be identified by canonical discriminant analysis of chemical composition with $70{\sim}91.7\;%$ accuracy. Low field NMR data followed by discriminant analysis, however, granted the 100% of accuracy for classification of soybeans.
Keywords
20 MHz pulsed NMR; soybean; black bean (yak-kong); origin; canonical discriminant analysis;
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