1Food and Agricultural Materials Inspection Center, Chuo, Saitama 330-9731, 2Food and Agricultural Materials Inspection Center, Kobe Regional Center, Chuo, Kobe, Hyogo 651-0082, Japan
A technique to determine the geographic origin of Japanese eel products was developed based on the analyses of 250 samples from Japan and China. Five elements (Mn, Fe, Zn, Sr and Ba) in samples were determined by using inductively coupled plasma mass spectrometry (ICP-MS). We developed five linear discriminant analysis (LDA) models for each production ground calibrated with concentrations of elements chosen by backward stepwise regression. These LDA models distinguished the origin of eel products with 85-94% certainty, and with 85-93% certainty in the validation test by 10-fold cross validation.