Determination of the geographic origin of edible burdocks [Arctium lappa L.] by inorganic analysis
2010
Funaki, N., Food and Agricultural Materials Inspection Center, Kobe (Japan). Kobe Regional Center | Hattori, S. | Kimura, Y. | Sato, K. | Tsukada, M. | Tsumura, A. | Sano, M. | Toyoda, M. | Kozuka, K. | Kadokura, M. | Homura, Y.
We developed an inorganic analysis technique for differentiating the geographic origin of edible burdock between Japan and China. After digesting 60 edible burdock from each Japan and China in acid, concentrations of 23 elements (Na, Mg, Al, P, K, Ca, Sc, Mn, Fe, Co, Ni, Cu, Zn, Sr, Rb, Cd, Ba, La, Ce, Nd, Sm, Gd and Tl) were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS). A linear discriminant analysis function was developed using five elements (Na, K, Ca, Ce and Tl), and the discrimination accuracy of function was 95% for both the Japanese and Chinese samples. Results of cross validation in three ways showed discrimination accuracy exceeding 93%. Therefore, this analysis shows promise for use in inspecting agricultural products. To confirm the practicality of this technique, we distributed two Japanese and two Chinese burdock samples to three laboratories in our organization for independent analysis. The geographic origin of all samples was correctly determined. Therefore, this technique might be useful for discriminating the location of origin for edible burdock between Japan and China.
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