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  • 08월 28일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

Selective determination of dopamine in presence of large extent ascorbic acid by differential pulse voltammetry method using electro polymerized glassy carbon electrode

등록일
2008년 8월 17일 14시 51분 49초
접수번호
1545
발표코드
32P134포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 <발표Ⅳ>
발표형식
포스터
발표분야
분석화학
저자 및
공동저자
S M Wabaidur, 김고은1, 이상학1
경북대학교 화학과, India
1경북대학교 화학과, Korea
Electrochemical determination of dopamine (DA) was achieved with improved selectivity and sensitivity in an excess of ascorbic acid (AA) on electro polymerized Glassy Carbon Electrode (GCE) by differential pulse Voltammetry. The probable reversibility and chemical kinetics of the electrochemical reaction for DA found was improved significantly compared to those obtained using a conventional glassy carbon electrode. Poly(4-(2-pyridylazo)-resorcinol) (PAR) was electro polymerized on the glassy carbon electrode that could act both as a catalyst and as a discriminating layer against AA based on the electrostatic interaction. Thus prepared electrode was enabled selective determination of DA even in a large excess of AA by differential pulse voltammetry at optimized phosphate buffer of pH 5. Linear response was found from 1.0×10−5 to 1.0×10−4 M and the limit of detection was 5.0×10−7 M. The relative standard deviation was found to be 3.34% from 10 independent measurements for 4.0×10−5 M of DA. Stable oxidation current of DA was observed even after 50 days storage in air. The recoveries of DA in the 100-fold diluted human urine samples were 98.7% for 5 measurements.

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