Simple and rapid HPLC method for simultaneous determination of atenolol and chlorthalidone in spiked human plasma

A simple, sensitive and rapid chromatographic method was developed and validated for the simultaneous quantification of atenolol and chlorthalidone in human plasma using hydrochlorothiazide as internal standard [IS]. The method utilized proteins precipitation with acetonitril as the only sample preparation involved prior to reverse phase-HPLC. The analytes were chromatographed on Shim-pack cyanopropyl column with isocratic elution with 10 mM KH2PO4 [pH 6.0] - methanol [70:30, v/v] at ambient temperature with flow rate of 1 mL min-1 and UV detection at 225 nm. The chromatographic run time was less than 10 min for the mixture. The calibration curves were linear over the range of 0.1-10 mg mL-1. The method was validated in terms of accuracy, precision, absolute recovery, freeze-thaw stability, bench-top stability and re-injection reproducibility. The within- and between-day accuracy and precision were found to be within acceptable limits <15%. The analytes were stable after three freeze-thaw cycles [deviation <15%]. The proposed method was specific for the simultaneous determination of atenolol and chlorthalidone in human plasma where there was no interference from endogenous biological substances

HPLC method for simultaneous determination of amiloride hydrochloride and hydrochlorothiazide in human plasma

A simple, sensitive and rapid chromatographic method was developed and validated for the quantification of a binary mixture namely; [amiloride hydrochloride and hydrochlorothiazide] in human plasma using chlorthalidone as internal standard [IS]. The method utilized proteins precipitation with acetonitril as the only sample preparation involved prior to reverse phase-HPLC. The analytes were chromatographed on Shim-pack cyanopropyI column with isocratic elution with 10 mM KH[2]PO[4] [pH 4.50]-methanol [70:30 v/v] at ambient temperature with flow rate 1 ml/min and UV detection. The chromatographic run time was less than 10 min for the mixture. The calibration curves were linear over the range 0.1-10 micro g ml[-1]. The method was validated in terms of accuracy, precision, absolute recovery, freeze-thaw stability, bench-top stability and re-injection reproducibility. The within-and between-day accuracy and precision were found to be within acceptable limits <15%. The analytes were stable after three freeze-thaw cycles [deviation <15%]. The proposed method is specific for determination of the mixture in human plasma where there is no interference from endogenous biological substances