title: A stability-indicating high performance liquid chromatographic (HPLC) assay for the simultaneous determination of atorvastatin and amlodipine in commercial tablets.
abstract: A simple, rapid, precise and accurate isocratic reversed-phase stability-indicating HPLC method was developed and validated for the simultaneous determination of atorvastatin (AT) and amlodipine (AM) in commercial tablets. The method has shown adequate separation for AM, AT from their associated main impurities and their degradation products. Separation was achieved on a Perfectsil Target ODS-3, 5 microm, 250 mm x 4.6 mm i.d. column using a mobile phase consisting of acetonitrile-0.025 M NaH(2)PO(4) buffer (pH 4.5) (55:45, v/v) at a flow rate of 1 ml/min and UV detection at 237 nm. The drugs were subjected to oxidation, hydrolysis, photolysis and heat to apply stress conditions. The linearity of the proposed method was investigated in the range of 2-30 microg/ml (r=0.9994) for AT and 1-20 microg/ml (r=0.9993) for AM. The limits of detection were 0.65 microg/ml and 0.35 microg/ml for AT and AM, respectively. The limits of quantitation were 2 microg/ml and 1 microg/ml for AT and AM, respectively. Degradation products produced as a result of stress studies did not interfere with the detection of AT and AM and the assay can thus be considered stability-indicating.
authors.affiliation: Department of Drug and Food Control, Faculty of Pharmacy, Medical Sciences University of Tehran, Tehran, Iran. alimohammadi@tums.ac.ir
authors.forename: A
authors.initials: A
authors.lastname: Mohammadi
authors.forename: N
authors.initials: N
authors.lastname: Rezanour
authors.forename: M
authors.initials: M
authors.lastname: Ansari Dogaheh
authors.forename: F
authors.initials: F
authors.lastname: Ghorbani Bidkorbeh
authors.forename: M
authors.initials: M
authors.lastname: Hashem
authors.forename: R B
authors.initials: RB
authors.lastname: Walker
mesh_terms: D017311:Amlodipine / Q000032:analysis*; D000069059:Atorvastatin; D002121:Calcium Channel Blockers / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006538:Heptanoic Acids / Q000032:analysis*; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000032:analysis*; D011758:Pyrroles / Q000032:analysis*; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet; D013607:Tablets / Q000737:chemistry*
chemical_list: D002121:Calcium Channel Blockers; D006538:Heptanoic Acids; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors; D011758:Pyrroles; D013607:Tablets; D017311:Amlodipine; D000069059:Atorvastatin