Determnation of three kinds of phenolic acids in rat plasma after iv administration of Danhong Injection by HPLC-MS Study on chemical changes of salvianolic acid B and lithospermic acid aqueous under conditions of high temperature and high pressure Determination of the Contents of Two Water Soluble Phenolic Acids in Den-shen (Salvia miltiorrhiza) Cultures by RP-HPLC Simultaneous determination of phenolic acids in Guanxinning injection by HPLC Determnation of three kinds of phenolic acids in rat plasma after iv administration of Danhong Injection by HPLC-MS