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Techniques to determine the producing country of Welsh onions (Allium fistulosum L.) were developed by using 216 samples from Japan and from Anchu Shandgon, Shanghai and Amoy Fjian in China. Twelve elements (Na, P, K, Ca, Mg. Mn, Fe, Cu, Zn, Sr, Ba, Al, Co, Ni, Rb, Mo, Cd, Cs, La, Ce, Tl and Pb) contained in Welsh onions were determined. In order to determining whether Welsh onions originate in Japan or in China, linear discriminant analysis (LDA) and soft independent modeling of class analogy (SIMCA) were performed, using concentrations of 20 elements excluding Al and Pb in 22 elements. In LDA for two-group discrimination modeled on Welsh onions from Japan and China, 103 samples used for modeling were classified 95% correctly, and 89 other samples were predicted 94% correctly. As the average of predictions by SIMCA modeled on samples selected by 10 times of random selections, 192 samples, including the 103 samples used for modeling, were predicted 96% correctly. In discriminations by combined LDA and SIMCA, all 81 samples produced in Japan were correctly judged to be Japanese ones, and only 8 samples out of 111 samples produced in China were not correctly judged to be Chinese ones.

Chemometric Techniques on Inorganic Elements Composition for the Determination of the Geographic Origin of Welsh Onions