HPLC determination of chikusetsusaponin IVa in Rhizoma PanacisMajoris from different producing areas Fingerprints and Heavy Metal Contents of Dendrobium officinale Produced from 12 Areas Quality evaluation of Schisandra chinensis at different producing areas in northease china The correlation between 2D-IR and HPLC in dried Rehmannia glutinosa processed by Different Processing Techniques