title: Dysprosium-sensitized chemiluminescence system for the determination of enoxacin in pharmaceutical preparations and biological fluids with flow-injection sampling.
abstract: A novel trivalence dysprosium(Dy(3+))-sensitized chemiluminescence method was developed for the first time for the determination of enoxacin (ENX) using flow-injection sampling based on the chemiluminescence (CL) associated with the reaction of the Dy(3+)-cerium(Ce(IV))-S(2)O(3) (2-)-ENX system and the Dy(3+)-MnO(4) (-) S(2)O(3) (2-)-ENX system. The analytical conditions for CL emission were investigated and optimized. The relationship between the CL intensity of ENX and its concentration has good linearity, with a correlation coefficient of 0.9984-0.9994. The limit of detection (LOD, 3sigma) was 0.20 ng/mL for the Dy(3+)-ENX-S(2)O(3)(2-)-Ce(IV)-H(2)SO(4) system and 0.22 ng/mL for the Dy(3+)-ENX-S(2)O(3)(2-)-MnO(4) (-)-HNO(3) system. The relative standard deviation (RSD, n = 11) was 1.8% for 11 determinations of 60 ng/mL ENX. The proposed method was applied to the analysis of ENX in injections, serum and urine samples with a recovery of 98%-105%. A possible mechanism for this sensitized CL reaction is discussed by comparing the CL spectra with the fluorescence emission spectra. The proposed method represents a wide linear range, high sensitivity and accuracy, and can be used for the routine determination of ENX in pharmaceutical preparations and biological fluids.
authors.affiliation: College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China.
authors.forename: Han-wen
authors.initials: HW
authors.lastname: Sun
authors.forename: Yuan-yuan
authors.initials: YY
authors.lastname: Wu
authors.forename: Li-qing
authors.initials: LQ
authors.lastname: Li
mesh_terms: D001826:Body Fluids / Q000737:chemistry / Q000378:metabolism*; D004419:Dysprosium / Q000378:metabolism*; D015365:Enoxacin / Q000737:chemistry / Q000378:metabolism*; D017022:Flow Injection Analysis / Q000379:methods; D006801:Humans; D049449:Luminescence; D004364:Pharmaceutical Preparations / Q000737:chemistry / Q000378:metabolism*
chemical_list: D004364:Pharmaceutical Preparations; D004419:Dysprosium; D015365:Enoxacin