Study on HPLC-DAD-ELSD fingerprint of Polygoni Cuspidati Rhizoma et Radix Quality evaluation of Astragali Radix through chemical pattern recognition of fingerprint by HPLC-DAD-ELSD HPLC-DAD-ELSD Fingerprint ofRadix Astragali in Longxi Simultaneous determination of flavones and saponins of Rhizoma Anemarrhenae by HPLC-DAD-ELSD