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    Please use this identifier to cite or link to this item: https://ir.fy.edu.tw:8080/ir/handle/987654321/3266


    Title: On-line concentration and separation of indolamines, catecholamines, and metanephrines in capillary electrophoresis using high concentration of poly(diallyldimethylammonium chloride
    Authors: Tseng, Wei-Lung;Chen, Sheng-Min;Hsu,Chih-Yao;Hsieh, Ming-Mu
    Contributors: 輔英科技大學 應用化學及材料科學系
    Keywords: Neurotransmitters;Capillary electrophoresis;Stacking;Polyelectrolyte
    Date: 2008-04-14
    Issue Date: 2010-09-28 16:53:43 (UTC+8)
    Abstract: This paper tackles a simple and efficient method for the simultaneous separation and stacking of neurotransmitters in capillary electrophoresis with UV detection. By using poly(diallyldimethylammonium chloride) (PDDAC) as a buffer additive, the high and reversed EOF are observed. Moreover, the mobility of indolamines and catecholamines decreases as the PDDAC concentration increases. Based on the difference in mobility in the presence and absence of PDDAC, the analytes were simply stacked between the boundary of the sample zone and the background electrolyte containing PDDAC. The separation of 14 analytes including indolamines, catecholamines, and metanephrines was accomplished within 33 min under optimal conditions (1.2% PDDAC and 5 mM formic acid at pH 4.0), and the values of relative standard deviation of their migration time were less than 3.1%. By applying stacking methods for fourteen analytes, we observed: (a) the sample injection volume of sample is up to 216 nL, (b) the limits of detection at signal-to-noise of 3 range from 15.4 to 122.1 nM, and (c) the sensitivity enhancements, compared to normal injection (12 nL), range from 110- to 220-fold. Under the optimal stacking conditions, the present method has been applied to analyze of vanillomandelic acid, 5-hydroxyindole-3-acetic acid, dopamine, tryptamine, and 3-indoxyl sulfate in urine samples.
    Relation: Analytica Chimica Acta,Volume 613, Issue 1, Pages 108-115
    Appears in Collections:[應用化學及材料科學系] 期刊論文

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