title: Combination of liquid-phase microextraction and on-column stacking for trace analysis of amino alcohols by capillary electrophoresis.
abstract: We described a new method for the enrichment of basic drugs present in water samples via liquid-phase microextraction (LPME) combined with on-column stacking in capillary electrophoresis. Two steps were employed to enhance the detection sensitivity of four amino alcohols. The analytes were first extracted from aqueous sample (donor solution) that were adjusted to basic through a thin layer of 1-octanol entrapped within the pores of a polypropylene hollow fiber, and then into a 5-microl acidic acceptor solution inside the hollow fiber. The extract was then further enriched through on-column stacking in capillary electrophoresis. With this two-step enrichment procedure, the method provided 72-110-fold preconcentration of the target amino alcohols. The limits of detection were 0.08-0.5 microg/ml. Relative standard deviation (n=6) ranged between 4.3 and 6.9% for the studied drugs utilizing 2-amino-1-phenylethanol as internal standard. The extraction of amino alcohols in spiked urine samples was evaluated using the developed procedure.
authors.affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.
authors.forename: Li
authors.initials: L
authors.lastname: Hou
authors.forename: Xiujuan
authors.initials: X
authors.lastname: Wen
authors.forename: Chuanhong
authors.initials: C
authors.lastname: Tu
authors.forename: Hian Kee
authors.initials: HK
authors.lastname: Lee
mesh_terms: D000605:Amino Alcohols / Q000032:analysis* / Q000652:urine; D019075:Electrophoresis, Capillary / Q000379:methods*; D006801:Humans; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000605:Amino Alcohols