Correlation of powder particle size, cell wall-breaking, rate and in vitro dissolution rate of Liuwei Dihuang Pill Supercritical fluid extraction of paeonol from Liuwei Dihuang pill Establishment of quantitative determination methods of total glycoside groups composition in Chinese materia medica by differential anthrone-sugar hydrazone Study on reference extract solution of Liuwei Dihuang Pills Qualitative Recognition on Omitted Ingredients in Liuwei Dihuang Pills by Bayesian Analysis and PRIMA HPLC Fingerprint and chemical pattern recognition of Liuwei Dihuang Pills Rapid determination of loganin in Liuwei Dihuang Pills by NIR spectroscopy Determination of loganin and paeonol in Liuwei Dihuang pills by HPLC amalgamated of double UV waves