The overall quality control of Radix scutellariae by capillary electrophoresis fingerprint

The qualitative and quantitative analyses are developed for the overall quality control of Radix Scutellariae, a Chinese herb, by capillary electrophoresis fingerprint (CEFP). All experiments are carried out in an uncoated fused silica capillary (75 cm x 75-microm i.d., effective length 63 cm) with a 50 mmol/L sodium borate solution (containing 5% acetonitrile, pH 9.30) under 12 kV. The detection wavelength is set at 280 nm, and naproxen is selected as the referential peak. Some parameters are used to evaluate the similarities of CEFPs. Eight co-eluting peaks are selected as the fingerprint peaks of Radix Scutellariae. The similarities between each of the ten samples and the referential CEFP of Radix Scutellariae are evaluated both qualitatively and quantitatively. Determination results indicate that the baicalin contents from different locations are varied. The methods of CEFP and quantitative analysis are rapid, simple, and accurate, with good repeatability, and can be used for the quality control of Radix Scutellariae.