科研之友
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摘要
To provide the methodology for rapid quality evaluation of Lonicera japonica, we have established the stable quantitative model of near infrared spectroscopy (NIR). The performance of Bagging partial least squares (Bagging-PLS) model and Boosting partial least squares (Boosting-PLS) model was compared with that partial least squares (PLS) model based on the NIR data of ethanol precipitation process of Lonicera japonica. On this basis, the performance of these two models after variables selection was also studied by the methods of siPLS (synergy interval partial least squares) and CARS (competitive adaptive reweighted sampling). The experimental results showed that the prediction performance of Bagging-PLS and Boosting-PLS models was superior to PLS model with the latent factor of 10. The band of 820-1029.5 nm and 1030-1239.5 nm for the first batch was selected by the method of siPLS. In addition, the band of 820-1029.5 nm and 1030-1239.5 nm was selected for the second batch sample in the same method. Furthermore, the method of CARS was taken to select variables for the two batches samples with 5-fold cross-validation and 10-fold cross. validation. And the lowest RMSECV (root mean square error of cross-validation) values were used to take subset. Compared to the model performance without the method of CARS, the RMSEP value of the Bagging-PLS model and Boosting-PLS model for the concentration of chlorogenic acid reduced by 0.02-0.04 g/L and r(p) (correlation coefficient of prediction) value increased by 4%-5%. Generally, Bagging. PLS and Boosting-PLS could be regarded as rapid prediction methodsfor NIR quantitative models of ethanol precipitation process of Lonicera japonica.
