Abstract
As a rapid and accurate technique, near infrared (NIR) spectroscopy has been widely used in process monitoring to improve efficiency and ensure quality consistency. In the present work, the application of NIR spectroscopy for on-line quantitative monitoring of the concentration process of Wangbi tablets was investigated. Partial least squares regression (PLSR) models based on the full-range spectra or the key wavelengths selected by the competitive adaptive reweighted sampling (CARS) method were established. The accuracy of the CARS-PLSR method was greater than that of full-spectrum PLSR for three quality parameters (soluble solid contents, paeoniflorin and icariin). For the prediction set samples using the CARS-PLSR models the coefficients of determination (
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