http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Rafiq, Khezina,Mai, Hien Duy,Kim, Jin Kyung,Woo, Jae Min,Moon, Bo Mi,Park, Chan Hum,Yoo, Hyojong Elsevier Sequoia 2017 Sensors and actuators. B Chemical Vol.251 No.-
<P><B>Abstract</B></P> <P>A glassy carbon electrode (GCE) was successfully functionalized with amine groups (NH<SUB>2</SUB>) through the electrooxidation of carbamic acid, to produce an aminated GCE. The aminated GCE could be effectively used to detect current changes during the urease-catalyzed decomposition of urea. The silk fibroin (SF) scaffolds were used to place urease near the surface of the aminated GCE (urease/SF/aminated GCE). The prepared electrode was employed for electrochemical urea sensing utilizing cyclic voltammetry and amperometry techniques. The fabricated sensing platform displayed rapid detection response and high sensitivity of 112.3μAmM<SUP>−1</SUP> cm<SUP>−2</SUP> with a linear correlation between current and urea concentrations (0.3–2.7mM). Values for limit of detection (LOD) and limit of quantification (LOQ) were estimated to be 0.163mM and 0.394mM, respectively. The reproducible sensing responses recorded using the urease/SF/aminated GCE comprising replaceable SF discs (generated and functionalized with urease in the same batch) assure the suitability of the present platform for application in urea sensing devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Silk fibroin scaffolds are employed to place urease near the surface of the aminated glassy carbon electrode. </LI> <LI> The platform with urease/SF/aminated GCE exhibits rapid detection response and high sensitivity with linear correlation between current and urea concentrations. </LI> <LI> Reproducible sensing responses recorded using urease/SF/aminated GCE comprising replaceable SF discs, assure the suitability of the present platform for application in urea sensing devices. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kamel, Mahmoud M. The Korean Electrochemical Society 2014 Journal of electrochemical science and technology Vol.5 No.1
The DL-norvaline was electrochemically oxidized and deposited on the glassy carbon electrode surface using cyclic voltammetry (CV). The modified electrode was examined for electrochemical oxidation of hydroquinone (HQ) and catechol (CC). It exhibited good electrocatalytic ability towards their oxidation and simultaneous determination in a binary mixture using differential pulse voltammetry (DPV). The peak currents were linear to the concentration of HQ and CC, in the range from $5{\mu}M$ to $100{\mu}M$, and $4{\mu}M$ to $140{\mu}M$, respectively. The determination limits(S/N = 3) for HQ and CC were $1{\mu}M$ and $0.8{\mu}M$, respectively. The obtained modified electrode was applied to simultaneous detection of HQ and CC in water sample.
Electrochemical approaches for the determination of ranitidine drug reaction mechanism
Kumaran Vediappan,이창우 한국물리학회 2011 Current Applied Physics Vol.11 No.4
The electrochemical reduction reaction of ranitidine, an antileprotic drug, was studied in an aqueous potassium chloride buffer with a stationary glassy carbon electrode. Cyclic voltammetric studies showed a well-defined reduction peak in the potential range from 0.0 to ―1.8 V at pH values ranging from 1.0 to 11.0. The reduction was irreversible and has exhibited a diffusion-controlled adsorption. Controlled potential coulometry revealed four electron reductions with a total charge consumption of 785 mC. A systematic study of the experimental parameters that affected the square wave stripping response was carried out, and the conditions were optimized. A calibration plot was derived for the determination of the compound. The best determination range was obtained between 0.033 and 3.33 mg/L ranitidine with a relative standard deviation (n = 10) of 3 ppt (0.3%). Analytical applicability of the method was verified by the determination of ranitidine in tablets, dosing of drugs, gene profiling, monitoring of biologically important metabolites and urine samples. Also these techniques could make easier many arduous procedures such as in-situ assessment of weapons or toxic substances, environment pollution and others.
Ko, Young Chun The Basic Science Institute Chosun University 2014 조선자연과학논문집 Vol.7 No.2
When a hydrophobic and hydrophilic environments of bis(2,2'-bipyridyl) copper(II) ($Cu(bpy)_2{^{2+}}$) are produced in the presence of anionic surfactant sodium dodecyl sulfate (SDS), cyclic voltammetry is used to investigate the microscopic environments which occurs at the glassy carbon electrode. In order to see the relation between ${\Delta}E_p$ and a critical micelle concentration (CMC), ${\Delta}E_p$ vs. -Log[SDS] for the redox couples are plotted. The concentration at the intersection of two lines is 2.57 mM SDS, and this concentration can be determined as the CMC (relative error: below 0.03%; 2.63 mM SDS by surface tensiometry).
고영춘 조선대학교 기초과학연구원 2014 조선자연과학논문집 Vol.7 No.2
When a hydrophobic and hydrophilic environments of bis(2,2'-bipyridyl) copper(II) (Cu(bpy)2 2+) are produced in the presence of anionic surfactant sodium dodecyl sulfate (SDS), cyclic voltammetry is used to investigate the microscopic environments which occurs at the glassy carbon electrode. In order to see the relation between ΔEp and a critical micelle concentration (CMC), ΔEp vs. -Log[SDS] for the redox couples are plotted. The concentration at the intersection of twolines is 2.57 mM SDS, and this concentration can be determined as the CMC (relative error: below 0.03%; 2.63 mMSDS by surface tensiometry).
내피온-에틸렌디아민이 수식된 유리탄소전극으로 구리(Ⅱ) 이온의 정량
고영춘,김희철 한국분석과학회 2007 분석과학 Vol.20 No.3
Copper(II) ion was measured with the use of a perfluorinated sulfonated polymer-ethylenediamine(nafion-en) modified glassy carbon electrode. The electrode mechanism was based on the chemical reactivityof an imobilized layer (nafion-en) to yield complex [Cu(en)2]+2. The reduction potential peak by diferentialpulse voltametry(DPV) was observed at -0.4402V(±0.0050V) (vs. Ag/AgCl). The linear calibration curve wasobtained from 1.0×106 to 1.0×104M copper(II) ion concentration, and the detection limit(3s) was 1.96. 106M.
Lee, Kyeong-Jong,Yoon, Il,Lee, Shim-Sung,Lee, Bu-Yong Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.3
The complex of iron(II) tris(3-Br-phen) (3-Br-phen; 3-bromo-1,10-phenanthroline) was prepared as a precursor of electropolymerization and the crystal structure of [Fe(3-Br-phen)3]($PF_6$)2${\cdot}$CH3CN with a distorted octahedral geometry has been investigated. The reductive electropolymerization of $>[Fe(3-Br-phen)3]^{2+}$ complex onto the surface of a glassy carbon electrode and indium tin oxide (ITO) optically transparent electrode were performed in acetonitrile at room temperature. Thin film of poly-$>[Fe(3-Br-phen)3]^{2+}$ formed was adherent, electroactive and stably deposited on a glassy carbon disk electrode. The thin metallopolymeric film formed was also confirmed by absorption spectroscopy.
( Rafiq Khezina ),유효종 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Glassy carbon electrode was successfully functionalized by amine groups (-NH<sub>2</sub>) to produce aminated glassy carbon electrode (aminated GCE) through electrooxidation of carbamic acid. Urease-functionalized silk-fibroin (SF) was used for the immobilization of urease near the surface of aminated GCE. Electrochemical methods were employed for the urea sensing by utilizing prepared bioelectrode (Urs/SF/aminated GCE). The aminated GCE could be effectively used for the urea sensing by detecting current changes in the decomposition process of urea by urease. The fabricated sensing platform displayed a high sensitivity and linear correlation between current and urea concentrations. From the different silk fibroin discs generated and functionalized in the same batch, achievement of the similar sensing measurements makes the designed platform effective for portable urea sensing devices.
Kong, Young-Tae,Bae, Yun-Jung,Shim, Yoon-Bo Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.2
A glassy carbon electrode (GCE) modified with 2,2':6':2”-terpyridine (2,2':6':2”-TPR) using a spin coating method was applied for the highly selective and sensitive analysis of a trace amount of $Hg_2^{2+}$ ions. Various experimental parameters, which influenced the response of the 2,2':6':2”-TPR modified electrode to $Hg_2^{2+}$ ions, were optimized. The linear sweep and differential pulse voltammograms for the 2,2':6':2”-TPR modified electrode deposited with Hg show a well-defined anodic peak at +0.65 V (vs. Ag|AgCl). After a 25 min preconcentration time in an $Hg_2^{2+}$ ion solution (0.1 M acetate buffer, pH 5.0), differential pulse voltammetry(DPV) with 2,2':6':2”-TPR modified electrode shows a linear response between $1.0\;{\times}\;10^{-6}M\;and\;2.0\;{\times}\;10^{-7}M$. The least-square treatment of these data produce an equation of I[${\mu}A$] = 0.031 + 0.005C with r = 0.980(n = 5). The detection limit of this electrode with linear sweep voltammetry and differential pulse anodic voltammetry were $2.0\;{\times}\;10^{-6}M\;and\;8.0\;{\times}\;10^{-8}M$, respectively. The presence of Pb, Fe, Cd, Ti, Ni, Co, Mg, Al, Mn, and Zn did not interfere in the analysis of the $Hg_2^{2+}$ ion. The 2,2':6':2”-TPR modified GCE has been successfully applied in determination trace amounts of Hg in a human urine sample.