Influence of different processed methods on 10 kinds of ginsensides in Panacis Quinquefolii Radix Dissolution difference of ginsenosides from ultrafine granular powder and common powder traditional pieces of Panacis Quinquefolii Radix in vitro DNA barcoding identification of Ginseng Radix et Rhizoma and Panacis Quinquefolii Radix based on trnL-trnF sequences