Origin Traceability of Chinese Geographical Indication-featured Pork Based on Mineral Element Fingerprints
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Abstract:
The feasibility of tracing the origin of geographical indication-featured pork in China by analysis of mineral element fingerprints was invastigated. The contents of 33 mineral elements in Qingyu Black Pork from Bashan in Sichuan, Laiwu Black Pork from Shandong and Heiliu pork from Beijing were determined by inductively coupled plasma mass spectrometry (ICP-MS). Through element content screening and after the exclusion of the elements with contents below or close to the detection limit, 13 elements in the pork samples were screened out for further investigations. Statistical analysis of data was carried out through combining principal component analysis, multiple comparative analysis and discriminant analysis. Among them, the contents of the eight elements, Na, Fe, Co, Cu, Zn, Se, Rb and Sr, showed significant regional differences (p<0.05). Based on the comparison among Partial Least Squares Discriminant Analysis (PLS-DA), Orthogonal Signal Correction Based Partial Least Squares Discriminant Analysis (OPLS-DA), Support Vector Machine, Naive Bayesian, Decision Tree and Neural Network, OPLS-DA and decision tree classification models are more suitable for origin traceability of characteristic pork based on mineral element fingerprints. Mineral element fingerprint-based analysis has a long-term application prospect in origin traceability of geographical indication-featured pork in China.
