Based on the near infrared diffuse reflectance spectroscopy,the analytical methods of the fast and simultaneous determinations for asipilin,paracetamol and caffeine contained in the compound paracetamol have been built by the partial least squares method.For the three drug components asipilin,paracetamol and caffeine,the correlation coefficients 0.9994,0.9903 and 0.9994 have been obtained,the root mean square errors(RMSE) of the calibration samples were 0.313,0.520 and 0.0301,and the RMSE-s of the prediction samples were 1.07,0.464 and 0.309,respectively.
UV analytical method for the extraction liquid of the steroidal saponin from chinese medicine rhizoma paridis has been established by using the chemical subspace invariant to linear transformation method and the characteristics of the UV spectra.Based on the orthogonal test of L16(45),the five factors for the extraction of steroidal saponin from Yunnan rhizoma paridis,including the extraction time,the concentration of ethanol solution and its volumn,the time of heating reflux and the times of extraction,have been optimized according to the extraction ratio.The extraction ratio for the optimized extraction is up to 11.49%.It also has been proved that the time of heating reflux is the most important factor.
