Study on Geoherbalism and Origin Identification of Sanqi(Panax Notoginseng)Based on Laser-induced Breakdown Spectroscopy
Objective The genuineness and origin identification of Sanqi(Panax Notoginseng)were studied based on laser-induced breakdown spectroscopy(LIBS)combined with chemometrics.Method Partial least squares discriminant analysis(PLS-DA)was implemented to discrimate origin of Sanqi(Panax Notoginseng)from Wenshan and Qujing in Yunnan province.Then VIP value was used to screen the important elements contributing to the classification.Results Combined with PLS-DA,LIBS can discriminant Sanqi(Panax Notoginseng)of Wenshan and Qujing effectively.The PLS-DA model using complete spectra as input variables showed good classification performance.The specificity,sensitivity and total accuracy were all 100％in training set of PLS-DA model,and were 90.9％,90％and 95％in the validation set,respectively.The VIP value was used to screen the variables contributing to the classification of PLS-DA model.Furthermore,the other PLS-DA model was constructed using the screen the variables by VIP value as input variables,which had better discrimination performance.The down-selection of the dataset specifically focused on the major elements(Si,Mg,Ca,Na and K),devoting to the geoherbalism of Sanqi(Panax Notogin-seng).Conclusion This work proposed a novel method for origin identification and geoherbalism study of Chinese medicine.
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