Method: To determine the DPPH free radical scavenging activity and assay of four bioactive components: baicalin, baicalein, wogonin and wogonin 7 O glucuronide by HPLC.

• 方法:测定清除DPPH自由基活性,并以HPLC法测定黄芩苷、黄芩素、汉黄芩苷和汉黄芩素的含量。