title: Quantitative separation of oxytocin, norfloxacin and diclofenac sodium in milk samples using capillary electrophoresis.
abstract: A simple, sensitive and rapid method has been developed for simultaneous separation and quantification of three different drugs: oxytocin (OT), norfloxacin (NOR) and diclofenac (DIC) sodium in milk samples using capillary electrophoresis (CE) with UV detection at 220 nm. Factors affecting the separation were pH, concentration of buffer and applied voltage. Separation was obtained in less than 9 min with sodium tetraborate buffer of pH 10.0 and applied voltage 30 kV. The separation was carried out from uncoated fused silica capillary with effective length of 50 cm with 75 microm i.d. The carrier electrolyte gave reproducible separation with calibration plots linear over 0.15-4.0 microg/mL for OT, 5-1000 microg/mL for NOR and 3-125 microg/mL for DIC. The lower limits of detection (LOD) were found to be 50 ng/mL for OT, and 1 microg/mL for NOR and DIC. The method was validated for the analysis of drugs in milk samples and pharmaceutical preparations with recovery of drugs within the range 96-100% with RSD 0.9-2.8%.
authors.affiliation: National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, Pakistan. ambersolangi@gmail.com
authors.forename: Amber R
authors.initials: AR
authors.lastname: Solangi
authors.forename: Saima Q
authors.initials: SQ
authors.lastname: Memon
authors.forename: Arfana
authors.initials: A
authors.lastname: Mallah
authors.forename: M Y
authors.initials: MY
authors.lastname: Khuhawar
authors.forename: M I
authors.initials: MI
authors.lastname: Bhanger
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000302:isolation & purification; D001881:Borates / Q000737:chemistry; D002020:Buffaloes; D004008:Diclofenac / Q000302:isolation & purification*; D019075:Electrophoresis, Capillary / Q000379:methods*; D005260:Female; D006863:Hydrogen-Ion Concentration; D016014:Linear Models; D008892:Milk / Q000737:chemistry*; D009643:Norfloxacin / Q000302:isolation & purification*; D010120:Oxytocics / Q000302:isolation & purification; D010121:Oxytocin / Q000302:isolation & purification*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D001881:Borates; D010120:Oxytocics; D004008:Diclofenac; D010121:Oxytocin; C010634:sodium borate; D009643:Norfloxacin