期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 60, 期 7, 页码 1628-1634出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf204296p
关键词
rice; geographic origin; chemometrics; inductively coupled plasma (ICP); isotope ratio; Sr; Pb; multielement
The objective of this study was to develop a technique for determining the country of origin of rice in the Japanese market. The rice samples included a total of 350 products grown in Japan (n = 200), the United States (n = 50), China (n = 50), and Thailand (n = 50). In this study, Sr-87/Sr-86 and Pb isotope ((204)pb, (206)pb, Pb-207 and Pb-208) ratios and multielement concentrations (Al, Fe, Co, Ni, Cu, Rb, Sr, and Ba) were determined by high-resolution inductively coupled plasma mass spectrometry. By combining three chemometric techniques based on different principles and determination criteria, the countries of origin of rice were determined. The predictions made by 10-fold cross-validation were around 97% accurate. The presented method demonstrated the effectiveness of determining the geographic origin of an agricultural product by combining several chemometric techniques using heavy element isotope ratios and multielement concentrations.
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