期刊文献+
共找到386篇文章
< 1 2 20 >
每页显示 20 50 100
Cyclic Voltammetry Determination of Epinephrine with a Nano-gold Modified Glassy Carbon Electrode in the Presence of High Concentration Ascorbic Acid 被引量:1
1
作者 HongZHANG XueQinGUI 《Chinese Chemical Letters》 SCIE CAS CSCD 2002年第2期153-156,共4页
Nano-gold (NG) modified glassy carbon electrodes (GCEs) were used for determination of epinephrine (EP) in the presence of high concentration ascorbic acid (AA) by cyclic voltammetry (CV). This modified electrode can... Nano-gold (NG) modified glassy carbon electrodes (GCEs) were used for determination of epinephrine (EP) in the presence of high concentration ascorbic acid (AA) by cyclic voltammetry (CV). This modified electrode can not only catalytically oxidize EP and AA, but also separate the catalytic peak potentials of EP and AA by about 183.5 mV. In pH = 7.0 ogisogate byffer solution, the linear range of epinephrine was 5 106 ~ 1 ?10-4 mol/L. 展开更多
关键词 NANO-GOLD glassy carbon electrode EPINEPHRINE ascorbic acid cyclic voltammetry.
下载PDF
The Electrochemical Behavior and the Determination of Bavistin on Glassy Carbon Electrode
2
作者 Yuan Zhe PIAO Gui Fen WANG(Department of Chemistry, Yanbian University, Yani 133002) 《Chinese Chemical Letters》 SCIE CAS CSCD 1998年第8期747-748,共2页
In this paper, the electrochendcal behavior of bavistin (MBC) on glassy carbon electrode is reported. In a base solution of pH=9.0 NH3-NH4Cl, a sensitive anodic peak was found by cyclic voltammetry. Differential pulse... In this paper, the electrochendcal behavior of bavistin (MBC) on glassy carbon electrode is reported. In a base solution of pH=9.0 NH3-NH4Cl, a sensitive anodic peak was found by cyclic voltammetry. Differential pulse stripping voltanunetry was applied for determing MBC in grains. The detection limit is 4×10-8mo/L.The recovery is from 91.3% to 95.7%. The method has advantages of simplicity and high sensitivity. 展开更多
关键词 bavistin glassy carbon electrode cyclic voltammetry differential pulse stripping voltammetry PESTICIDE
下载PDF
Voltammetric behavior of sedative drug midazolam at glassy carbon electrode in solubilized systems 被引量:5
3
作者 Rajeev Jain Rajeev Kumar Yadav 《Journal of Pharmaceutical Analysis》 SCIE CAS 2012年第2期123-129,共7页
Redox behavior of midazolam was studied at a glassy carbon electrode in various buffer systems,supporting electrolytes and pH using differential paise,square-wave and cyclic voltammetry.Based on its reduction behavior... Redox behavior of midazolam was studied at a glassy carbon electrode in various buffer systems,supporting electrolytes and pH using differential paise,square-wave and cyclic voltammetry.Based on its reduction behavior,a direct differential pulse voltammetric method has been developed and validated for the determination of midazolam in parenteral dosage.Three welldefined peaks were observed in 0.1% SLS,Britton-Robinson (BR) buffer of pH 2.5.The effect of surfaetants like sodium lauryl sulfate (SLS),cetyl trimethyl ammonium bromide (CTAB) and Tween 20 was studied.Among these surfactants SLS showed significant enhancement in reduction peak.The cathodic peak currents were directly proportional to the concentration of midazolam with correlation coetfficient of 0.99. 展开更多
关键词 MIDAZOLAM voltammetry SURFACTANT glassy carbon electrode Parenteral dosage form
下载PDF
Voltammetric quantitation of nitazoxanide by glassy carbon electrode
4
作者 Rajeev Jain Rajeev Kumar Yadav Jahangir Ahmad Rather 《Journal of Pharmaceutical Analysis》 SCIE CAS 2013年第6期452-455,共4页
The present study reports voltammetric reduction of nitazoxanide in Britton-Robinson (B-R) buffer by cyclic and square-wave voltammetry at glassy carbon electrode. A versatile fully validated voltammetric method for... The present study reports voltammetric reduction of nitazoxanide in Britton-Robinson (B-R) buffer by cyclic and square-wave voltammetry at glassy carbon electrode. A versatile fully validated voltammetric method for quantitative determination of nitazoxanide in pharmaceutical formulation has been proposed. A squrewave peak current was linear over the nitazoxanide concentration in the range of 20-140 ~tg/mL. The limit of detection (LOD) and limit of quantification (LOQ) was calculated to be 5.23 la~/mL and 17.45 la~/mL, respectively. 展开更多
关键词 NITAZOXANIDE Squarewave voltammetry glassy carbon electrode Pharmaceuticalformulation
下载PDF
Electrochemical behavior of paclitaxel and its determination at glassy carbon electrode
5
作者 Jayant I.Gowda Sharanappa T.Nandibewoor 《Asian Journal of Pharmaceutical Sciences》 SCIE CAS 2014年第1期42-49,共8页
The electrochemical behavior of paclitaxel drug was studied at a glassy carbon electrode in phosphate buffer solutions using cyclic and differential-pulse voltammetric techniques.The oxidation process was shown to be ... The electrochemical behavior of paclitaxel drug was studied at a glassy carbon electrode in phosphate buffer solutions using cyclic and differential-pulse voltammetric techniques.The oxidation process was shown to be irreversible over the pH range(3.0e10.4)and was diffusion controlled.Effects of anodic peak potential(E_(p)),anodic peak current(Ipa),scan rate,pH,heterogeneous rate constant(k^(0)),etc have been discussed.A possible electrooxidation mechanism was proposed.An analytical method was developed for the determination of paclitaxel in phosphate buffer solution at pH¼7.0 as a supporting electrolyte.The anodic peak current varied linearly with paclitaxel concentration in the range 1.0×10^-(6)M to 1.0×10^-(5)M with a limit of detection(LOD)of 1.23×10^(-8)M and limit of quantification(LOQ)of 4.10×10^(-8)M.The proposed method was successfully applied to the determination of paclitaxel in pure and real samples. 展开更多
关键词 PACLITAXEL glassy carbon electrode voltammetry Injection analysis URINE
下载PDF
DNA Immobilization on Nano-Gold Modified Glassy Carbon Electrode 被引量:7
6
作者 Xiang Qin LIN Qian MIAO Bao Kang JIN(Department of Chemistry. University of Science and Technology of China, Hefei 230026)(Department of Chemistry. AnHui University. Hefei 230039) 《Chinese Chemical Letters》 SCIE CAS CSCD 1999年第2期157-160,共4页
CT-DNA were electrochemically immobilized on the surfaces of both nano-gold modified glassy carbon electrode and bare glassy carbon electrode. The cyclic voltammetric behavior of Co (phen)(3)(3+) adsorbed on the immob... CT-DNA were electrochemically immobilized on the surfaces of both nano-gold modified glassy carbon electrode and bare glassy carbon electrode. The cyclic voltammetric behavior of Co (phen)(3)(3+) adsorbed on the immobilized DNA was studied. Increase in the peak current of Co (phen)(3)(3+) redox reaction was obtained on nano-gold modified glassy carbon electrode. The result suggests that more DNA molecules were immobilized on this electrode and nano-gold modification can enhance the heterogeneous electron transfer rate constant of the Co (phen)(3)(3+). 展开更多
关键词 DNA NANO-GOLD glassy carbon cyclic voltammetry
下载PDF
Electrooxidation of sulfanilamide and its voltammetric determination in pharmaceutical formulation,human urine and serum on glassy carbon electrode 被引量:2
7
作者 Bruno R.L.Ferraz Tiago Guimaraes +1 位作者 Demetrius Profeti Luciene P.R.Profeti 《Journal of Pharmaceutical Analysis》 SCIE CAS CSCD 2018年第1期55-59,共5页
For the first time, sulfanilamide(SFD) was determined in otologic solution, human urine and serum by electroanalytical techniques on glassy carbon electrode(GCE). The cyclic voltammetry(CV) experiments showed an irrev... For the first time, sulfanilamide(SFD) was determined in otologic solution, human urine and serum by electroanalytical techniques on glassy carbon electrode(GCE). The cyclic voltammetry(CV) experiments showed an irreversible oxidation peak at t 1.06 V in 0.1 mol/L BRBS(p H ? 2.0) at 50 m V/s. Different voltammetric scan rates(from 10 to 250 m V/s) suggested that the oxidation of SFD on the GCE was a diffusioncontrolled process. Square-wave voltammetry(SWV) method under optimized conditions showed a linear response to SFD from 5.0 to 74.7 μmol/L(R ? 0.999) with detection and quantification limits of 0.92 and3.10 μmol/L, respectively. The developed SWV method showed better results for detection limit and linear range than the chronoamperometry method. It has been successfully applied to determine SFD concentration in pharmaceutical formulation, human urine and serum samples with recovery close to 100%. 展开更多
关键词 SQUARE-WAVE voltammetry SULFANILAMIDE glassy carbon electrode Biological FLUIDS
下载PDF
Voltammetric sensor based on cobalt-poly(methionine)-modified glassy carbon electrode for determination of estriol hormone in pharmaceuticals and urine 被引量:1
8
作者 Eliziana S. Gomes Fernando R.F. Leite +2 位作者 Bruno R.L. Ferraz Henrique A.J.L. Mourao Andrea R. Malagutti 《Journal of Pharmaceutical Analysis》 SCIE CAS CSCD 2019年第5期347-357,共11页
A voltammetric sensor based on the electropolymerization of cobalt-poly(methionine)(Co-poly(Met)) on a glassy carbon electrode (GCE) was developed and applied for the determination of estriol by differential pulse vol... A voltammetric sensor based on the electropolymerization of cobalt-poly(methionine)(Co-poly(Met)) on a glassy carbon electrode (GCE) was developed and applied for the determination of estriol by differential pulse voltammetry (DPV) for the first time. The electrochemical properties of the Co-poly(Met)/GCE were analysed by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to characterize the polymers on the GCE surface. The deposition of the Co-poly(Met) film on the GCE surface enhanced the sensor electronic transfer. CV studies revealed that estriol exhibits an irreversible oxidation peak at t0.58 V for the Co-poly(Met)/GCE (vs. Ag/AgCl reference electrode) in 0.10 mol/L Britton-Robinson buffer solution (pH=7.0). Different voltammetric scan rates (10-200 mV/s) suggested that the estriol oxidation on the Co-poly(Met)/GCE surface is controlled by adsorption and diffusion processes. Based on the optimized DPV conditions, the linear responses for estriol quantification were from 0.596 μmol/L to 4.76 μmol/L (R2 =0.996) and from 5.66 μmol/L to 9.90 μmol/L (R2 =0.994) with a limit of detection (LOD) of 0.0340 μmol/L and a limit of quantification (LOQ) of 0.113 μmol/L. The DPV-Co-poly(Met)/GCE method provided good intra-day and inter-day repeatability with RSD values lower than 5%. Also, no interference of real sample matrices was observed on the estriol voltammetric response, making the DPV-Copoly( Met)/GCE highly selective for estriol. The accuracy test showed that the estriol recovery was in the ranges 96.7%-103% and 98.7%-102% for pharmaceutical tablets and human urine, respectively. The estriol quantification in pharmaceutical tablets performed by the Co-poly(Met)/GCE-assisted DPV method was comparable to the official analytical protocols. 展开更多
关键词 ESTRIOL ELECTROANALYSIS Differential pulse voltammetry Cobalt-poly(methionine) film-modified glassy carbon electrode
下载PDF
Direct Electrochemistry of Catalase on Single Wall Carbon Nanotubes Modified Glassy Carbon Electrode
9
作者 QiangZHAO LunHuiGUAN ZhenNanGU QianKunZHUANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2005年第4期501-504,共4页
Direct electrochemistry of catalase (Ct) has been studied on single wall carbon nanotubes (SWNTs) modified glassy carbon (GC) electrode. A pair of well-defined nearly reversible redox peaks is given at –0.48... Direct electrochemistry of catalase (Ct) has been studied on single wall carbon nanotubes (SWNTs) modified glassy carbon (GC) electrode. A pair of well-defined nearly reversible redox peaks is given at –0.48 V (vs. SCE) in 0.1 mol/L phosphate solution (pH 7.0). The peak current in cyclic voltammogram is proportional to the scan rate. The peak potential of catalase is shifted to more negative value when the pH increases. Catalase can adsorb on the SWNTs modified electrode. 展开更多
关键词 carbon nanotubes CATALASE cyclic voltammetry modified electrode.
下载PDF
Electrochemical Behavior of Chalcone at a Glassy Carbon Electrode and Its Analytical Applications
10
作者 Keerti M. Naik Sharanappa T. Nandibewoor 《American Journal of Analytical Chemistry》 2012年第9期656-663,共8页
A simple and rapid method was developed using cyclic, differential pulse and square wave voltammetric techniques for the determination of trace-level chalcone at a glassy carbon electrode. Chalcone could produce two a... A simple and rapid method was developed using cyclic, differential pulse and square wave voltammetric techniques for the determination of trace-level chalcone at a glassy carbon electrode. Chalcone could produce two anodic peaks at about 0.514 V and 1.478 V and a cathodic peak at about -0.689 V. The differential pulse voltammerty presents a good linear response as compared to square wave voltammetry in the range of 0.2 - 10 μM with a detection limit of 0.18 μM. The proposed method was used successfully for its quantitative determination in spiked human plasma and urine as real samples. 展开更多
关键词 CHALCONE voltammetry glassy carbon electrode ELECTROCHEMICAL Determination Oxidation
下载PDF
Preparation and Cyclic Voltammetry Characterization Of Cu-dipyridyl Imprinted Polymer
11
作者 YiNingZENG NingZHENG 《Chinese Chemical Letters》 SCIE CAS CSCD 2002年第4期317-320,共4页
Polymer capable of specific binding to Cu-dipyridyl complex was prepared by molecular imprinting technology. The binding specificity of the polymer to the template (Cu-dipyridyl complex) was investigated by cyclic vo... Polymer capable of specific binding to Cu-dipyridyl complex was prepared by molecular imprinting technology. The binding specificity of the polymer to the template (Cu-dipyridyl complex) was investigated by cyclic voltametric scanning using the carbon paste electrode modified by polymer particles in phosphate buffer solution. Factors that influence rebinding of the imprinted polymer were explored. The result demonstrated that the cyclic voltammetry was an efficient approach to explore interactions between template and imprinted polymers. 展开更多
关键词 Molecular imprinted polymer copper(II)dipyridyl complex carbon paste electrode cyclic voltammetry.
下载PDF
Voltammetric Detection of Nanomolar Levels of Hypoxanthine in the Presence of Copper(Ⅱ) at Glassy Carbon Electrode
12
作者 Hu Shengshui Cui Dafu Marco Mascini 《Wuhan University Journal of Natural Sciences》 CAS 1999年第1期101-104,共4页
Nanomolar levels of the hypoxanthine in NaOH electrolyte cantaining copper(Ⅱ) can be determined by anodic stripping voltammetry at a glassy carbon electrode. In the present article hypoxanthine Cu + is shown to be ... Nanomolar levels of the hypoxanthine in NaOH electrolyte cantaining copper(Ⅱ) can be determined by anodic stripping voltammetry at a glassy carbon electrode. In the present article hypoxanthine Cu + is shown to be adsorbed on the electrode surface in the presence of an excess of copper(Ⅱ). After accumulation period, hypoxanthine Cu + was stripped from the electrode surface and the anodic current coming near to the oxidation of Cu(Ⅰ) to Cu(Ⅱ) was measured. A linear calibration curve in the range of 5 nmol/L 1.5 mmol/L hypoxanthine, with a detection limit of 0.5 nmol/L hypoxanthine were obtained. 展开更多
关键词 HYPOXANTHINE COPPER glassy carbon electrode stripping voltammetry
下载PDF
Electrocatalytic oxidation of hydrazine with alizarin red S as a homogenous mediator on the glassy carbon electrode
13
作者 Mohammad Mazloum-Ardakani Roya Mazidi +2 位作者 Mohammad Hossein Mashhadizadeh Parvanah Rahimi Mohammad Ali Karimi 《Science China Chemistry》 SCIE EI CAS 2010年第5期1194-1200,共7页
Electro-catalytic oxidation and detection of hydrazine on a glassy carbon electrode,at pH 6.0,was studied by using alizarin red S as a homogeneous mediator.The overall number of electrons involved in the catalytic oxi... Electro-catalytic oxidation and detection of hydrazine on a glassy carbon electrode,at pH 6.0,was studied by using alizarin red S as a homogeneous mediator.The overall number of electrons involved in the catalytic oxidation of hydrazine and that involved in the rate-determining step were four and one,respectively.The interfering effect of some cations,anions and organic compounds were examined.Peak current for this process varied linearly with the square root of the scan rate.The kinetic parameters,such as the electron transfer coefficient(α) and catalytic rate constant(k) ,were determined using cyclic voltammetry,linear sweep voltammetry and chronoamperometry.The electro-catalytic response was optimized with regards to the pH,scan rate,hydrazine concentration and other variables. 展开更多
关键词 ALIZARIN red S HYDRAZINE glassy carbon electrode electro-catalytic oxidation voltammetry
原文传递
Electrooxidation of Nitric Oxide at a Glass Carbon Electrode Modified with Functionalized Single-walled Carbon Nanotube 被引量:1
14
作者 LI Li SHI Ke-ying 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2010年第6期1025-1030,共6页
The electrocatalytic oxidation of nitric oxide(NO) at a glass carbon electrode(GC) modified with functionalized single-walled carbon nanotubes(SWCNTs) was investigated by cyclic voltammetry(CV) and electrochem... The electrocatalytic oxidation of nitric oxide(NO) at a glass carbon electrode(GC) modified with functionalized single-walled carbon nanotubes(SWCNTs) was investigated by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS).It was found that the SWCNT modified electrode could speed greatly up the electron transfer rate compared with the bare GC electrode.After the SWCNT was treated with alkali or mixed acids,the reaction rate and activation energy of NO electrooxidation were changed to different extent.Chemical modification of the SWCNT surface is one of the most powerful methods to change the sensitivity of NO electrooxidation reaction.The modified electrode with SWCNT obtained by the firstly alkali treatment and then the mixed acids treatment was the best one for NO electrooxidation,the result of CV was also confirmed by that of EIS.The anodic processes of NO were recognized more clearly by exploring the reaction mechanism of NO electrooxidation at the SWCNT modified electrode. 展开更多
关键词 Single-walled carbon nanotube Modified electrode Nitric oxide Electrocatalytic oxidation cyclic voltammetry
下载PDF
基于氮掺杂介孔碳修饰玻碳微球糊电极的双酚A电化学传感器的构建及性能研究
15
作者 贺嘉夫茹孜 马伟平 李永红 《广州化工》 CAS 2024年第14期35-38,81,共5页
制备了一种由氮掺杂介孔碳修饰的玻碳微球糊电极,用于双酚A的灵敏、快速检测。利用循环伏安法对修饰电极进行了表征,采用方波伏安法研究了双酚A在修饰电极上的电化学行为;根据不同扫速下峰电流与扫速的关系讨论了双酚A在电极表面的反应... 制备了一种由氮掺杂介孔碳修饰的玻碳微球糊电极,用于双酚A的灵敏、快速检测。利用循环伏安法对修饰电极进行了表征,采用方波伏安法研究了双酚A在修饰电极上的电化学行为;根据不同扫速下峰电流与扫速的关系讨论了双酚A在电极表面的反应过程。在最优的实验条件下,双酚A的响应电流与浓度在0.3~2μM和2~30μM范围内时呈线性关系,检测限是0.01μM(S/N=3)。该方法具有良好的重现性和抗干扰性,可用于实际样品的检测,样品回收率为97.5%~101.5%。 展开更多
关键词 双酚A 氮掺杂介孔碳 玻碳微球糊电极 方波伏安法 循环伏安法 电化学传感器
下载PDF
LiPF6 and lithium difluoro(oxalato)borate/ethylene carbonate+dimethyl carbonate+ethyl(methyl)carbonate electrolyte for LiNi0.5Mn1.5O4 cathode 被引量:2
16
作者 ZHOU Hong-ming GENG Wen-jun LI Jian 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第5期1013-1018,共6页
LiODFB electrolyte’s compatibility with LiNi0.5Mn1.5O4high-voltage cathode material was studied by cyclic voltammetry, charge-discharge test and AC impedance. The results show that at 25 and 60 °C, the LiODFB-ba... LiODFB electrolyte’s compatibility with LiNi0.5Mn1.5O4high-voltage cathode material was studied by cyclic voltammetry, charge-discharge test and AC impedance. The results show that at 25 and 60 °C, the LiODFB-based electrolyte has better electrochemical stability than LiPF6. AC impedance plots show that the LiODFB battery has a lower charge-transfer resistance than LiPF6battery at 60 °C, which indicates that LiODFB battery has excellent cycling performance at high temperature. At 25 and 60 °C, the LiNi0.5Mn1.5O4/Li half cells with LiODFB or LiPF6as electrolyte all have simple redox peak, showing that each of them has an excellent reversibility. LiODFB battery has better cycle performance than LiPF6battery at 25 °C and 60 °C. At 25 °C, their 0.5C initial discharge specific capacities are 126.3 and 131.6 mA·h/g, and their capacity retention ratios of the 100th cycle are 97.1% and 94.7%, respectively. At 60 °C, their 0.5C initial discharge specific capacities are 132.6 and 129.1 mA·h/g, and their capacity retention ratios of the 100th cycle are 94.1% and 81.7%, respectively. © 2017, Central South University Press and Springer-Verlag GmbH Germany. 展开更多
关键词 carbonATION Cathodes Charge transfer cyclic voltammetry Electric batteries Electric discharges Electric impedance electrodes Electrolytes Lithium compounds Manganese
下载PDF
Use of Graphene and Cucurbit[7]uril Electrodes for the Determination of Amantadine in Biological Fluids 被引量:2
17
作者 C. S. H. Domínguez P. Hernández 《American Journal of Analytical Chemistry》 2015年第7期623-630,共8页
A differential pulse voltammetry (DPV) method for amantadine (AT) determination is developed. To this end, all the chemical and instrumental variables affecting the determination of amantadine are optimized. These stu... A differential pulse voltammetry (DPV) method for amantadine (AT) determination is developed. To this end, all the chemical and instrumental variables affecting the determination of amantadine are optimized. These studies have used three types of glassy-carbon electrode, first electrode which has not undergone surface modification or coating, to then modify the working electrode surface with two kinds of suspensions: graphene and graphene-cucurbit[7]uril (CB[7]). From studies of the mechanisms governing the electrochemical response of amantadine, it was concluded that it is an electrochemically system with a diffusive reduction phenomenon. Under optimal conditions and with the appropriate electrode modification, we proceed to study the relation between the peak intensity with the analyte concentration. Thus, we find that when the electrode surface is covered with graphene-CB[7], two linear sections are obtained, the first one in the concentration range of between 0.05 μg·mL﹣1 and 0.75 μg·mL﹣1;and the second one between 1.00 μg·mL﹣1 and 6.00 μg·mL﹣1, with Er (%) = 87 and R.S.D. = 0.94% (n = 10 at 0.5 μg·mL﹣1 level). The minimum detectable amount was 15 ng·mL﹣1 while a concentration of 44 ng·mL﹣1 was calculated as determination limit. The optimized method was applied to the determination of amantadine in biological fluids. 展开更多
关键词 glassy-carbon electrode AMANTADINE Differential Pulse voltammetry Human URINE
下载PDF
Aptasensor Based on Screen-Printed Carbon Electrodes Modified with CS/AuNPs for Sensitive Detection of Okadaic Acid in Shellfish 被引量:2
18
作者 Ni Zeng Xinyi Wang +4 位作者 Yiyang Dong Yan Yang Yingai Yin Lianhui Zhao Xu Wang 《Journal of Analysis and Testing》 EI CSCD 2023年第2期128-135,共8页
Okadaic acid(OA),a small molecule substance derived from shellfish,is one of the most widely distributed marine toxins with acute symptoms of vomiting and diarrhea after accidental ingestion.For this,there is an urgen... Okadaic acid(OA),a small molecule substance derived from shellfish,is one of the most widely distributed marine toxins with acute symptoms of vomiting and diarrhea after accidental ingestion.For this,there is an urgently need for sensitive and reliable methods to detect OA in real shellfish samples.In this study,a simple aptasensor based on screen-printed carbon electrode(SPCE)with modification of chitosan(CS)and gold nanoparticles(Au NPs)was designed for electrochemical determination of OA,and the electrode surface was modified with Au NPs by potential-sweeping electrodeposition,which greatly improved the electrochemical response.The entire detection and characterization process were carried out by cyclic voltammetry(CV)with a linear correlation in the range of 0.01-100 ng/m L and a limit of detection(LOD)of 6.7 pg/m L.Furthermore,recovery rates of 92.3-116%were obtained demonstrating excellent accuracy through the recovery trial of mussel and scallop samples. 展开更多
关键词 Okadaic acid APTASENSOR Screen-printed carbon electrode CHITOSAN Gold nanoparticles cyclic voltammetry
原文传递
聚瓜氨酸修饰电极测定烟酰胺
19
作者 尹明静 张秀玉 +2 位作者 王宜磊 马心英 陈美凤 《现代化工》 CAS CSCD 北大核心 2023年第6期249-253,共5页
通过电聚合的方法在玻碳电极表面形成聚瓜氨酸膜(PCit/GCE),制备了聚瓜氨酸玻碳电极,用于测量烟酰胺(NA),建立了测定烟酰胺的新方法。结果表明,利用PCit/GCE测定烟酰胺有较高的灵敏度,还原峰电流明显增强,烟酰胺检出浓度4.0×10^(-7... 通过电聚合的方法在玻碳电极表面形成聚瓜氨酸膜(PCit/GCE),制备了聚瓜氨酸玻碳电极,用于测量烟酰胺(NA),建立了测定烟酰胺的新方法。结果表明,利用PCit/GCE测定烟酰胺有较高的灵敏度,还原峰电流明显增强,烟酰胺检出浓度4.0×10^(-7)mol/L。烟酰胺浓度还原峰电流在4.00×10^(-6)~1.00×10^(-4)mol/L范围内有良好的线性关系,线性方程式为i_(pc)(A)=5.32×10^(-7)+0.36c(mol/L),相关系数R为0.9939。PCit/GCE修饰电极测定护肤品和奶粉中的NA,回收率分别为96.1%、97%。 展开更多
关键词 瓜氨酸 玻碳电极 烟酰胺 循环伏安法
原文传递
杀螟硫磷在离子液体修饰预处理玻碳电极上的电化学行为及测定
20
作者 刘新胜 曹祥 李永红 《化学研究与应用》 CAS 北大核心 2023年第7期1579-1586,共8页
采用滴涂法制备了离子液体(IL)修饰预处理玻碳电极(IL/PGCE),建立了一种用于高效检测杀螟硫磷(FNT)的方法。利用循环伏安法(CV)对IL/PGCE进行了表征;通过方波伏安法(SWV)研究了杀螟硫磷在修饰电极上的电化学行为,并利用扫速研究了杀螟... 采用滴涂法制备了离子液体(IL)修饰预处理玻碳电极(IL/PGCE),建立了一种用于高效检测杀螟硫磷(FNT)的方法。利用循环伏安法(CV)对IL/PGCE进行了表征;通过方波伏安法(SWV)研究了杀螟硫磷在修饰电极上的电化学行为,并利用扫速研究了杀螟硫磷在IL/PGCE上的反应过程;讨论了pH值、预处理电位和时间、修饰剂含量、富集电位和时间等影响传感器性能的重要参数。在最优条件下,修饰电极对杀螟硫磷展现出较好的电化学响应,在0.001~1μg·L^(-1)和1~100μg·L^(-1)的范围内,峰电流与杀螟硫磷浓度之间呈现良好的线性关系。该方法具有较好的重现性和抗干扰能力,能够用于实际样品中杀螟硫磷的检测,样品回收率为89.6%~125.5%。 展开更多
关键词 玻碳电极 预处理 离子液体 方波伏安法 杀螟硫磷
下载PDF
上一页 1 2 20 下一页 到第
使用帮助 返回顶部