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A simple, precise, accurate, stability-indicating isocratic reverse phase High-performance liquid chromatographic (RP-HPLC)
method was developed for the quantitative determination of purity of Valsartan drug substance in pharmaceutical dosage
forms in the presence of its impurities and degradation products. The method was developed using shimadzu, lc-2010HT (LC
SOLUTIONS software),Xterra RP18 (150mm x 4.6mm5 μm)column with mobile phase containing mixture of 45% of 0.05M
Potassium dihydrogen phosphate buffer of pH 2.5and 55% of Acetonitrile.The flow rate was 1.5 mL/min and injection volume
was 20 μL. The Column oven temperature was 30?C;diluent is mixture of water and acetonitrile in the ratio of 40:60. The eluted
compounds were monitored at 254 nm, the run time was within 10 min,in which Valsartan and its impurities were well separated.
Valsartan was subjected to the stress conditions of oxidative, acid, base, hydrolytic, thermal and photolytic degradation. Valsartan
was found to degrade significantly in acid and oxidative stress conditions and stable in base, hydrolytic and photolytic degradation
conditions. The degradation products were well resolved from main peak and its impurities,proving the stability-indicating power
of the method. A study was carried out by spiking all impurities at 1% of sample concentration in sample solution and peak purity
was evaluated. It was observed that there were no peaks interfering with the analyte which was evident from the purity data.
The difference between the assay results of spiked sample solution and unspiked sample solution made as per the test method.
The results were found to be within the specified limits. The developed method was validated as per international conference on
harmonization (ICH) guidelines with respect to specificity, linearity, limit of detection, limit of quantification, accuracy, precision
and robustness. This method was also suitable for the assay determination of Valsartan in pharmaceutical dosage forms.
Kapil Verma student of M.sc forensic science, Amity Institute of Forensic Science (AIFS) Amity University, Noida, Uttar Pradesh (India)-201303. He
has completed his B. Sc from Punjab Technical University, Punjab (India). He has 12 paper publications, poster Presentations, literature reviews to
National, International conferences, symposium and workshops and in reputed journals. Currently he is working on his Research topic related to
the clinical research.
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