Study on HPLC-DAD-ELSD fingerprint of Polygoni Cuspidati Rhizoma et Radix A Preliminary Research on the Quality of Musk Chromatography fingerprint of Schisandra chinensis Chewable Tablets by HPLC-DAD Quality Control of Plant Extract Application of genetic algorithm in blending technology for extractions of Cortex Fraxini Application of genetic algorithm in blending technology for extractions of Cortex Fraxini