title: Stability-indicating micellar electrokinetic chromatography technique for simultaneous measurement of delapril and manidipine from a combination drug formulation.
abstract: A stability-indicating micellar electrokinetic chromatography (MEKC) method was developed and validated for simultaneous analysis of delapril (DEL) and manidipine (MAN) using salicylic acid as an internal standard. The MEKC method was performed using a fused-silica capillary (effective length of 72 cm) with 50 mM of borate buffer and 5 mM of anionic surfactant sodium dodecylsulfate at pH 9.0 as the background electrolyte. The separation was achieved at 25 kV applied voltage and 35 degrees C. The injection was performed at 50 mbar for 5 s, with detection at 208 nm. The method was linear in the range of 15-150 microg/mL (r2 = 0.9966) for DEL and 5-50 microg/mL (r2 = 0.9985) for MAN with adequate results for the precision (< or = 1.87%) and accuracy (98.94% for DEL and 100.65% for MAN). The specificity of the method and its stability-indicating capability was demonstrated through forced degradation studies, which showed that there was no interference from the excipients. The Plackett-Burman experimental design was used for robustness evaluation, giving results within the acceptable range. The method was successfully applied for analysis of the drugs, and the results were compared to an LC method, resulting in nonsignificant differences (P = 0.78 and 0.84 for DEL and MAN, respectively).
authors.forename: Vítor
authors.initials: V
authors.lastname: Todeschini
authors.forename: Maximiliano da Silva
authors.initials: Mda S
authors.lastname: Sangoi
authors.forename: Alianise da Silva
authors.initials: Ada S
authors.lastname: Meira
authors.forename: Diogo
authors.initials: D
authors.lastname: Miron
authors.forename: Alini Dall Cortivo
authors.initials: AD
authors.lastname: Lange
authors.forename: Nadia Maria
authors.initials: NM
authors.lastname: Volpato
mesh_terms: D000806:Angiotensin-Converting Enzyme Inhibitors / Q000737:chemistry*; D002121:Calcium Channel Blockers / Q000737:chemistry*; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods*; D004095:Dihydropyridines / Q000737:chemistry*; D004338:Drug Combinations; D004355:Drug Stability; D007189:Indans / Q000737:chemistry*; D009578:Nitrobenzenes; D010879:Piperazines; D015203:Reproducibility of Results
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D002121:Calcium Channel Blockers; D004095:Dihydropyridines; D004338:Drug Combinations; D007189:Indans; D009578:Nitrobenzenes; D010879:Piperazines; C054218:manidipine; C047759:delapril