HPLC method for the determination of carboplatin and paclitaxel with cremophorEL in an amphiphilic polymer matrix

Simple and rapid reversed phase HPLC methods for individual as well as simultaneous analysis of paclitaxel and carboplatin with cremophorEL (CrEL) in an amphiphilic polymer matrix were developed. Different analytical performance parameters such as linearity, accuracy, precision, specificity, limit of detection (LOD) and limit of quantification (LOQ) were determined according to ICH guidelines. All the analytical methods were developed by reverse phase HPLC on C-18 column with a mobile phase comprising of water–acetonitrile run on isocratic mode for the analysis of carboplatin and gradient mode for individual analysis of paclitaxel and for simultaneous analysis of the two drugs at a flow rate of 1 ml/min at 227 nm. The proposed methods for independent analysis of the drugs elute out carboplatin in 4.3 min and paclitaxel in 10.5 min while in simultaneous analysis carboplatin shows Rt at 4 min and paclitaxel at 18 min with a continuous run for 17 more minutes to elute out CrEL. These methods were found to be specific as none of the components of the media, i.e. polymer, CrEL and buffer interfered with the drug peaks. The linearity of the calibration curves for each analyte in the desired concentration range was found to be good (r2 > 0.9995). The methods were accurate and precise with recoveries ranging from 98 to 101% for each drug and relative standard deviation (%RSD) <2%. Peaks corresponding to each of the drug showed positive value for the minimum peak purity index over the entire range of integrated chromatographic peak thus indicating the purity of the peaks. Stability analysis of the two drugs revealed that the drugs remain stable during the period of study.