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이수영,이장현,정영삼,Ly, Suw-Young,Lee, Chang-Hyun,Jung, Young-Sam Korean Chemical Society 2007 대한화학회지 Vol.51 No.5
DNA를 고정한 탄소나노튜브 페이스트 전극으로 옥시테트라싸이클린 항생제의 분석조건을 연구하였다. 사각 파형 벗김 전압전류법과 순환 전압 전류법을 사용하여 최적조건에서 1-10 ngL?1의 정량 가능 범위에 도달하였다. 벗김법 0.1 mgL?1 농도에서 15번 반복 측정하여 0.068%의 상대표준편차였으며, 벗김법 최적 분석 조건에서 0.4 ngL?1의 검출 한계를 얻었다. 개발된 결과를 양식어류의 세포에서 응용하였다. A simple prepared paste electrode (PE) of DNA immobilized on a carbon nanotube was utilized for monitoring the antibacterial agent oxytetracycline (OTC), using square-wave anodic stripping voltammetry (SWASV) and cyclic voltammetry (CV). Given these conditions, SWASV and CV working ranges were observed within 1-10 ngL-1 OTC. In the SWASV and CV for OTC concentrations of 0.1 mgL-1, the relative standard deviations (n=15) were 0.068 and 0.067, respectively. At the optimized condition, the detection limit was found to be 0.4 ngL-1 OTC. This method was applied to the hatchery fish tissue.
단신 : 벗김전압전류법을 이용한 카본나노튜브 전극에서의 구리 분석
최장군 ( Chang Kun Choi ),정영삼 ( Young Sam Jung ),김낙주 ( Nack Joo Kim ),박대원 ( Dae Won Pak ),정건용 ( Kun Yong Chung ),김래현 ( Lae Hyun Kim ),권용재 ( Yong Chai Kwon ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.5
In the present study, we evaluate the sensitivity and optimal stripping voltammetry (SV) conditions of copper (Cu), which is one of the main trace heavy metals inducing the environmental contamination, using carbon nanotube (CNT) electrode. In addition, the reaction mechanism of stripping reaction of Cu is investigated. The electrochemical analyses such as squarewave stripping voltammetry (SWSV) and linear scan voltammetry (LSV) are used for the evaluations, As a result of that, the best SWSV conditions like squarewave amplitude of 15 mV, frequency of 60 Hz, deposition potential of -1.0V vs. Ag/AgCl and deposition time of 200s are determined with the measured Cu sensitivity of 1.824 μA/μM. As a driving force affecting the stripping reaction of Cu, surface reaction is more dominant one than diffusion. These results are compared with other reference results and it is confirmed that our suggested CNT electrode gives rise to better Cu sensitivity result than other references.
BNP전극에서 전압-전류법에 의한 생체내 미량 수은의 정량
이장현,정영삼 평택대학교 자연과학연구소 2006 자연과학연구 Vol.- No.6
생체시료 중의 미량수은 정량을 비스므스와 고정된 탄소 나노 튜브 반죽전극을 사용하는 벗김 전압전류법과 순환 전압전류법으로 연구하였다. 수은의 검출한계는 석출시간, 석출전위, pH, 그리고 저어줌 속도 등에 의하여 크게 영향을 받았다. 검출한계는 52ppt이었고, 최적의 조건에서 상대표준편차는 1.1%지다. 이 방법은 보통의 전압전류법 방법들 보다 더 감응적인 것을 볼 수 있다. 이 방법은 분석시간이 짧고 감도가 높기 때문에 생체시료 중의 미량 수은분석에 유용하였다. The determination of the traced mercury level in bio-materials has been investigated through the square-wave stripping and cyclic voltammetry using bismuth and the fixed carbon nanotube paste electrode. The detection limit of the mercury varied greatly with deposing time, deposing potential, pH, and stirring rate. The detection limit was 52 ngL-1 and the relative standard deviation was 1.1% in the optimum condition. This method is more sensitive than general voltammetric methods. The method is recommended for tracing the mercury-level analysis of bio-materials because it is time-saving and has higher sensitivity.
Detection of guanine by electrochemical voltammetric method using graphite pencil carbon electrode
Lee, Chang Hyun,Ly, Suw Young,Jung, Young Sam 평택대학교 자연과학연구소 2005 자연과학연구 Vol.- No.5
Graphite Pencil Carbon Electrode (GPCE) was used in the electrochemical cyclic and square wave anodic stripping voltammetric method for the detection of guanine. The influences of pH, concentration, accumulation time, and other optimum conditions were determined. The analytical linear concentration range of 1.0160.0 mgL^(-1) with 60 s pre-concentration time was obtained. The relative standard deviation of 10.0, 100.0 mgL^(-1) is 0.16, 0.09% (n=15) using the optimum condition. Detection limit (S/N) was found to be 0.29 mgL^(-1). The analytical utility of GPCE in the detection of guanine could be applied to various biological samples.