title: Optimized analytical method for cyclosporin A by high-performance liquid chromatography-electrospray ionization mass spectrometry.
abstract: The Micromass Platform LCZ mass detector parameters were optimized for simultaneous recording of the protonated (CsA-H+), sodium adduct (CsA-Na+) and potassium adduct (CsA-K+) of cyclosporin A eluted from a Symmetry Shield RP8 column. The optimized procedure allows a precise analysis of CsA in whole blood or serum without removal of salts prior to analysis. The ratio of the three forms of CsA varied depending on the assay condition and the types of specimens being analyzed. The summation of three ionic forms of CsA detected by LC-ESI-MS is a reliable and simple method to assess CsA concentration in the blood.
authors.affiliation: Singapore Eye Research Institute, National University of Singapore. SERI_ZL@hotmail.com
authors.forename: L
authors.initials: L
authors.lastname: Zhou
authors.forename: D
authors.initials: D
authors.lastname: Tan
authors.forename: J
authors.initials: J
authors.lastname: Theng
authors.forename: L
authors.initials: L
authors.lastname: Lim
authors.forename: Y P
authors.initials: YP
authors.lastname: Liu
authors.forename: K W
authors.initials: KW
authors.lastname: Lam
mesh_terms: D002414:Cations, Monovalent; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D016572:Cyclosporine / Q000032:analysis* / Q000097:blood; D004563:Electrochemistry; D006801:Humans; D007118:Immunoassay; D013058:Mass Spectrometry; D011188:Potassium; D011522:Protons; D012212:Rheology; D012680:Sensitivity and Specificity; D012964:Sodium; D013696:Temperature
chemical_list: D002414:Cations, Monovalent; D011522:Protons; D016572:Cyclosporine; D012964:Sodium; D011188:Potassium