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[A novel approach to quality evaluation of root of Scutellaria baicalensis by DPPH free radical scavenging].

OBJECTIVE
To develop a simple, reliable approach for evaluating the quality of Huangqin (Scutellaria baicalensis).


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.


RESULT
The correlative relationship between DPPH free radical scavenging activity and baicalin content was obtained.


CONCLUSION
Bioassay of DPPH free radical scavenging activity could be used as one of the methods for quality evaluation of Chinese drug Huangqin.