Abstract
A rapid and simple determination of tropane-alkaloids (hyoscyamine, scopolamine) in gastrointestinal drugs was investigated by capillary electrophoresis. Micellar electrokinetic capillary chromatography (MEKC) using a fused silica capillary (560 mm×0.075 mm i.d.) in 0.1 M SDS 20 mM borate buffer (pH 10)/acetonitrile (97 : 3) gave complete separation of the two alkaloids within 40 min. A sample solution was introduced by pressure method (50 mbar, 3.7 s), separation conditions applied voltage 15 kV and on-column detection was performed at 210 nm. Calibration curves for hyocyamine and scopolamine showed a good linearity in the range of 4-12μg/ml(r=0.9970) and 390-1150 ng/ml(r=0.9976). The present method is applicable to the simple and rapid determination of hyoscyamine and scopolamine in commercial gastrointestinal drugs.
