title: Capillary electrophoresis with end-column electrochemiluminescence for the analysis of chloroquine phosphate and the study on its interaction with human serum albumin.
abstract: This paper describes a novel and sensitive method for the estimation of chloroquine phosphate (CQ) using capillary electrophoresis with end-column electrochemiluminescence (ECL) detection. Under the optimized condition, linear calibration curve was obtained for the system over two orders of magnitude with a detection limit of 3x10(-7) M (S/N=3). The relative standard deviations of the ECL intensity and the migration time were 1.4% and 0.05%, respectively (n=6, 5x10(-5) M CQ). Successful separation of chloroquine phosphate, difenidol hydrochloride and clomifene citrate was obtained at pH 7.0. Using the proposed electrochemiluminescence system, a simple method was proposed to study the interaction between chloroquine phosphate and human serum albumin (HSA), and the number of binding sites and binding constant were estimated to be 32.6 and 7.7x10(3) M(-1), respectively.
authors.affiliation: College of Chemistry & Chemical Engineering, Hunan University, Changsha, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Huang
authors.forename: Wen
authors.initials: W
authors.lastname: Pan
authors.forename: Manli
authors.initials: M
authors.lastname: Guo
authors.forename: Shouzhuo
authors.initials: S
authors.lastname: Yao
mesh_terms: D001665:Binding Sites; D002738:Chloroquine / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D002996:Clomiphene / Q000302:isolation & purification; D004563:Electrochemistry; D019075:Electrophoresis, Capillary / Q000379:methods*; D006801:Humans; D008163:Luminescent Measurements / Q000379:methods*; D009942:Organometallic Compounds; D010880:Piperidines / Q000302:isolation & purification; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012709:Serum Albumin / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; D010880:Piperidines; D012709:Serum Albumin; C415768:tris(2,2'-bipyridyl)ruthenium(II); D002996:Clomiphene; C023676:chloroquine diphosphate; D002738:Chloroquine; C004858:diphenidol