Abstract
A simple HPTLC method has been developed for the simultaneous determination of isoorientin, isovitexin, orientin, and vitexin, both pure and in commercial samples of bamboo-leaf flavonoids. The flavone C-glycosides, including isoorientin, isovitexin, orientin, and vitexin, were extracted from bamboo-leaf flavonoids with methanol and chromatographed on silica gel 60 plates in an automatic developing chamber with tetrahydrofurantolueneformic acidwater (16 8 2 1, v/v/v/v) mobile phase. Quantitation was obtained with UV detection at 350 nm. Polynomial calibration plots were constructed in the concentration range 2001200 ng/zone for isoorientin, 100600 ng/zone for isovitexin, 160960 ng/zone for orientin, and 30360 ng/zone for vitexin with good correlation coefficients (r ≥ 0.9995). The method was validated for precision (interday and intraday), repeatability, and accuracy. Accuracy of the method was evaluated by a recovery study conducted at three different levels, and the average recovery was found to be 93.95% for isoorientin, 95.30% for isovitexin, 99.79% for orientin, and 100.46% for vitexin. The proposed HPTLC method for estimation of isoorientin, isovitexin, orientin, and vitexin was found to be simple, precise, specific, and accurate and can be used for manufacturing QC of bamboo-leaf flavonoids or for governmental regulatory purposes.
Development and validation of HPTLC method for simultaneous determination of amlodipine besylate and metoprolol succinate in bulk and tablets
