METHODS Decocted respectively the Tripterygium wilfordii and the four Chinese crude drugs with water, and evaluated the triptolide by HPLC.

• 方法4种饮片分别与雷公藤配伍，加水提取，用HPLC测定雷公藤单提液及其配伍提取液中的雷公藤内酯醇。