title: Polymer monolith microextraction online coupled to hydrophilic interaction chromatography/mass spectrometry for analysis of beta2-agonist in human urine.
abstract: An analytical method based on online combination of polymer monolith microextraction (PMME) technique with hydrophilic interaction LC (HILIC)/MS is presented. The extraction was performed with a poly(methacrylic acid-co-ethylene glycol dimethacrylate) monolithic column while the subsequent separation was carried out on a Luna silica column by HILIC. After 1:1 v/v dilution with 20 mM phosphate solution at pH 7.0 and centrifugation, urine sample was directly used for extraction. After optimization, 85% ACN (containing 0.3% formic acid v/v) was used for rapid online elution, which was also the mobile phase in HILIC to avoid band broadening during separation or carry-over that was usually observed in PMME-RP LC system. Online automation of extraction and separation procedures was realized under the control of a program in this study. The developed method was applied to rapid and sensitive monitoring of three beta2-agonist traces in human urine. The LODs (S/N = 3) of the method were found to be 0.05-0.09 ng/mL of beta2-agonists in urine. The recoveries of three beta2-agonists spiked in five different urine samples ranged from 79.8 to 119.8%, with RSDs less than 18.0%.
authors.affiliation: Department of Chemistry, Wuhan University, Wuhan, P.R. China.
authors.forename: Ming-Ming
authors.initials: MM
authors.lastname: Zheng
authors.forename: Man-Yu
authors.initials: MY
authors.lastname: Zhang
authors.forename: Yu-Qi
authors.initials: YQ
authors.lastname: Feng
mesh_terms: D000318:Adrenergic beta-Agonists / Q000652:urine*; D002853:Chromatography, Liquid / Q000295:instrumentation / Q000379:methods*; D005026:Ethylene Glycols / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D013058:Mass Spectrometry / Q000295:instrumentation / Q000379:methods*; D008689:Methacrylates / Q000737:chemistry*; D015394:Molecular Structure; D009994:Osmolar Concentration; D012680:Sensitivity and Specificity; D012822:Silicon Dioxide / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D013997:Time Factors
chemical_list: D000318:Adrenergic beta-Agonists; D005026:Ethylene Glycols; D008689:Methacrylates; C502776:poly(methacrylic acid-ethylene glycol dimethacrylate); D012965:Sodium Chloride; D012822:Silicon Dioxide