[Comparative study on baicalin contents in 4 traditional Chinese medicinal preparations of ying huang].

The contents of baicalin in four different traditional Chinese medicinal preparations of Ying Huang were determined by HPLC. The contents of baicalin in Ying Huang tablets, Ying Huang oral liquid, Ying Huang injection and Ying Huang granules are respectively: 124.18 mg/g, 21.12 mg/ml, 12.39 mg/ml and 6.79 mg/g. The HPLC method suggested in this paper can be used for quality control in the production of Ying Huang preparations.