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Assay of Trace Gold Ion in a Skin Cell Using a Stripping Voltammetry
( Suw Young Ly ),( Jin Hui Lee ),( Jae Hun Yi ) 한국유화학회 2011 한국응용과학기술학회지 Vol.28 No.1
Threelectrodes systems were used in stripping voltammetry (SW) and cyclic voltammetry (CV) instead of the expensive platinum and Ag/AgCl reference electrodes. Moreover, the electrolyte solution was used with deep seawater, which can reduce water pollution, is more eco-friendly, and has a lower cost. The analytical optimum parameters measured via CV and SW and with working ranges were obtained from 10 to 80 ug/L using fluorine immobilized on a graphite pencil electrode (FE). Under the optimum conditions, the analytical detection limit of 6.30 ug/LAu was obtained. The results of the study can be applied to diagnostic assay for natural minerals and human finger tissue.
Toxicological Investigation of Radioactive Uranium in Seawater
Ly, Suw-Young,Bae, Jeong-Mi,Kim, Jin Korean Society of ToxicologyKorea Environmental Mu 2012 Toxicological Research Vol.28 No.1
Trace uranium detection measurement was performed using DNA immobilized on a graphite pencil electrode(DGE). The developed probe was connected to the portable handheld voltammetric systems used for seawater analysis. The sensitive voltammogram was obtained within only 30 s accumulation time, and the anodic stripping working range was attained at 100~800 ${\mu}g/l$ U and 10~50 ${\mu}g/l$. The statistic relative standard deviation of 30.0 mg/l with the $15^{th}$ stripping was 0.2115. Here, toxicological and analytical application was performed in the seawater survey in a contaminated power plant controlling water. The results were found to be applicable for real-time toxicological assay for trace control.
Simultaneous Diagnostic Assay of Catechol and Caffeine Using an in vivo Implanted Neuro Sensor
Ly, Suw-Young,Lee, Chang-Hyun,Jung, Young-Sam,Kwon, O-Min,Lee, Ji-Eun,Baek, Seung-Min,Kwak, Kyu-Ju Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.9
Catechol and caffeine were simultaneously analyzed with a bismuth-immobilized carbon nanotube paste electrode (BPE) using square wave (SW) stripping voltammetry. Optimum analytical conditions were determined. Simultaneous working ranges of 100-1,500 $mgL^{-1}$ for caffeine and 5-75 $mgL^{-1}$ for catechol were obtained. In the separated cell systems, a working range of 0.1-2.1 $mgL^{-1}$ catechol with a correlation coefficient of 0.9935, and a working range of 10-210 $mgL^{-1}$ caffeine with a correlation coefficient of 0.9921 were obtained. A detection limit (S/N) of 0.15 $mgL^{-1}$ (7.7 ${\times}$ $10^{-7}$ M) and a detection limit of 0.02 $mgL^{-1}$ (1.82 ${\times}$ $10^{-7}$ M), respectively, manifested for catechol and caffeine. It was found that three macro-type electrode systems could be implanted in fish and rat neuro cells. For both ions, the ion currents were observed. The physiological impulse conditions and the neuronal thinking current were also obtained.
Voltammetric Assay of Mercury Ion in Fish Kidneys
Ly, Suw-Young Korean Society of ToxicologyKorea Environmental Mu 2008 Toxicological Research Vol. No.
Voltammetric analysis of mercury ions was developed using paste electrodes (PEs) with DNA and carbon nanotube mixed electrodes. The optimized analytical results of the cyclic voltammetry (CV) of the $1{\sim}14ng\;L^{-1}Hg(II)$ concentration and the square wave (SW) stripping voltammetry of the $1{\sim}12ng\;L^{-1}Hg(II)$ working range within an accumulation time of 400 seconds were obtained in 0.1 M $NH_4H_2PO_4$ electrolyte solutions of pH 4.0. For the relative standard deviations of the $1ng\;L^{-1}Hg(II)$, which were observed at 0.078% (n = 15) at the optimum conditions, the low detection limit (S/N) was pegged at $0.2ng\;L^{-1}(7.37{\times}10^{-13}M)$ for Hg(II). The results can be applied to assays in biological fish kidneys and wastewater samples.
Analysis of Lead Ions in a Waste Solution Using Infrared Photo-Diode Electrode
Ly, Suw-Young,Lee, Hyun-Kuy,Kwak, Kyu-Ju,Ko, Jun-Seok,Lee, Jeong-Jae,Cho, Jin-Hee,Kim, Ki-Hong,Kim, Min-Seok,Lee, So-Jung Korean Society of ToxicologyKorea Environmental Mu 2008 Toxicological Research Vol.25 No.4
To detect lead ions using electrochemical voltammetric analysis, Infrared Photo-Diode Electrode(IPDE) was applied via cyclic and square wave stripping voltammetry. Lead ions were deposited at 0.5 V(versus Ag/AgCl) accumulation potential. Instrumental measurements systems were made based on a simple and compact detection system. The stripping voltammetric and cyclic voltammetric optimal parameters were searched. The results yielded a cyclic range of $40{\sim}240mgl^{-1}$ Pb(II) and a square wave stripping working range of $0.5{\sim}5.00mgl^{-1}$ Pb(II). The relative standard deviation at 2 and 4 $mgl^{-1}$ Pb(II) was 0.04% and 0.02%(n=15), respectively, using the stripping voltammetric conditions. The detection limit was found to be 0.05 $mgl^{-1}$ with a 40 sec preconcentration time. Analytical interference ions were also evaluated. The proposed method was applied to determine lead ions in various samples.
Investigation of Water Safety in Non-treated Drinking Water with Trace Toxic Metals
Ly, Suw Young,Kim, Dae Hong,Lee, Ga Eun Korean Society of ToxicologyKorea Environmental Mu 2013 Toxicological Research Vol.29 No.3
The trace toxic metal copper was assayed using mercury immobilized on a carbon nanotube electrode (MCW), with a graphite counter and a reference electrode. In this study, a macro-scale convection motor was interfaced with a MCW three-electrode system, in which a handmade MCW was optimized using cyclic- and square-wave stripping voltammetry. An analytical electrolyte for tap water was used instead of an expensive acid or base ionic solution. Under these conditions, optimum parameters were 0.09 V amplitude, 40 Hz frequency, 0.01 V incremental potential, and a 60-s accumulation time. A diagnostic working curve was obtained from 50.0 to 350 ${\mu}g/L$. At a constant Cu(II) concentration of 10.0 ${\mu}g/L$, the statistical relative standard deviation was 1.78% (RSD, n = 15), the analytical accumulation time was only 60 s, and the analytical detection limit approached 4.6 ${\mu}g/L$ (signal/noise = 3). The results were applied to non-treated drinking water. The content of the analyzed copper using 9.0 and 4.0 ${\mu}g/L$ standards were 8.68 ${\mu}g/L$ and 3.96 ${\mu}g/L$; statistical values $R^2$ = 0.9987 and $R^2$ = 0.9534, respectively. This method is applicable to biological diagnostics or food surveys.
Young Ly, Suw,Keun Kim, Jong Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of biochemical and molecular toxicology Vol.23 No.4
<P>The electrical circuit of an infrared photodiode electrode (IPE) was used in the simultaneous assay of copper and cadmium ions. The electrode's cyclic voltammetry (CV), chronoamperometry and square-wave (SW) stripping voltammetric optimum conditions were examined. Results for 0–160 mg L<SUP>−1</SUP> and 50–400 μg L<SUP>−1</SUP> SW Cu(II) Cd(II), the relative standard deviation of 0.158 Cu(II), 0.077 Cd(II) (n = 15) using 20.0 mg L<SUP>−1</SUP> have been obtained at optimum conditions. The low detection limit (S/N) was attained to be at 14.71 μg L<SUP>−1</SUP>(2.31 × 10<SUP>−7</SUP> mol L<SUP>−1</SUP>) Cu(II) and 18.42 μg L<SUP>−1</SUP>(1.63 × 10<SUP>−7</SUP> mol L<SUP>−1</SUP>) Cd(II). The handmade electrode was implanted deep in the muscle of live fish and interfaced with an electrochemical workstation. Real-time analytical application was performed on the online assay of living tissue as the specimen was moving. The methods are deemed useful in interfaced assay for physiological control, nanodiode fabrication, and in the production of laboratory on a biochip. © 2009 Wiley Periodicals, Inc. J Biochem Mol Toxicol 23:256–262, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/jbt.20287</P>
Diagnosis of Trace Toxic Uranium Ions in Organic Liver Cell
Ly, Suw Young,Pack, Eun Chul,Choi, Dal Woong Korean Society of ToxicologyKorea Environmental Mu 2014 Toxicological Research Vol.30 No.2
Uranium is toxic and radioactive traces of it can be found in natural water and soils. High concentrations of it in biological systems cause genetic disorders and diseases. For the in vivo diagnosis, micro and nano range detection limits are required. Here, an electrochemical assay for trace toxic uranium was searched using stripping voltammetry. Renewable and simplified graphite pencils electrode (PE) was used in a three-electrode cell system. Seawater was used instead of an electrolyte solution. This setup can yield good results and the detection limit was attained to be at $10{\mu}gL^{-1}$. The developed skill can be applied to organic liver cell.
Toxic Effect of Cadmium Assay in Contaminated Soil Earthworm Cell Using Modified Sensor
Ly, Suw Young,Kyung, Lee,Kim, Chae Hwa,Seo, Roma,Lee, Soo Youn,Kim, Lina,Chae, Su min,Choi, Sung Wook,Kim, Ji Yoon Korean Society of ToxicologyKorea Environmental Mu 2015 Toxicological Research Vol.31 No.2
A voltammetric toxic metal of cadmium detection was studied using a fluorine doped graphite pencil electrode (FPE) in a seawater electrolyte. In this study, square wave (SW) stripping and chronoamerometry were used for determination of Cd(II) in seawater. Affordable pencils and an auxiliary electrode were used as reference. All experiments in this study could be performed at reasonable cost by using graphite pencil. The application was performed on the tissue of contaminated soil earthworm. The results show that the method can be applicable for vegetables and in vivo fluid or medicinal diagnosis.