5,10,15—三（4—氨基）苯基—20—苯基卟啉的电聚合膜及其金属化膜的电分…

本文对新型结构的卟啉进行电化学聚合，制得聚卟啉修饰电极，并在此基础上直接进行金属化，得到金属化的Ｃｕ聚卟啉修饰电极，实验表明，聚卟啉修饰电极在ｐＨ１－６的范围，对ｐＨ的变化呈能斯特响应，斜率为５９．８ｍＶ／ｐＨ，金属化Ｃｕ聚卟啉ｐＨ也具有能斯特响应，范围为ｐＨ４－８，斜率为２８．７ｍＶ／ｐＨ。可用于实际样品的测定。     

聚苯胺/钴-氧化钴膜作传感元件的pH传感器的性能

研究了在玻碳电极上修饰不同物质所制得的pH传感器,通过电位滴定的方法比较得出先修饰聚苯胺,再修饰钴-氧化钴膜的电极对pH有较好的响应,能代替玻璃电极应用在实际样品测定中. 探究了最佳修饰条件为:先在0.1 mol/L苯胺的盐酸(1 mol/L)溶液中, 电位范围为-0.2～1.0 V,以100 mV/s 的扫描速率循环伏安扫描10圈修饰聚苯胺膜;接着在含2.0×10-4 mol/L Co2+的磷酸盐缓冲溶液(PBS)(pH=7.5)中,电位范围为-1.2～1.2 V,以100 mV/s的扫描速率循环伏安扫描 5圈修饰钴-氧化钴膜. 得到的修饰电极响应斜率为-61.60 mV/pH,响应范围pH值为0.5～13.     

基于聚氨基苯硼酸修饰电极的新型pH传感器

采用电聚合方法制备了聚氨基苯硼酸(PABA)膜修饰玻碳电极的新型pH传感器。利用红外图谱和交流阻抗谱对PABA膜的修饰进行了表征。考察了该修饰电极在不同pH的Britton-Robinson(BR)缓冲溶液中的循环伏安响应。结果表明,阴极还原峰电位与底液pH具有良好的线性关系,线性范围为pH 2.01~8.00,能斯特响应斜率为-153 mV/pH。将该修饰电极用于弱酸及中性实际样品pH测定,结果满意。     

聚苯胺/钴-氧化钴膜作传感元件的pH传感器的性能

本文研究了在玻碳电极上修饰不同物质所制得的pH传感器,通过电位滴定的方法比较得出先修饰聚苯胺,再修饰钴-氧化钴膜的电极对pH有较好的响应,能代替玻璃电极应用在实际样品测定中。探究了最佳修饰条件为：先在0.1mol/L苯胺的盐酸（1mol/L）溶液中, 电位范围为-0.2~1.0V,以100 mV/s 的扫描速度循环伏安扫描 10圈修饰聚苯胺膜;接着在含2.0×10-4 mol/LCo2+的PBS （pH=7.5）缓冲溶液中, 电位范围为-1.2~1.2V,以100 mV/s 的扫描速度循环伏安扫描 5圈修饰钴-氧化钴膜。得到的修饰电极响应斜率为-61.60 mV/pH,响应范围pH 0.5~13。     

溶胶-凝胶法修饰的硫氰酸根离子选择性电极(ISE)的研究

报道了一种基于溶胶-凝胶技术的新型硫氰酸根电极,讨论了电极性能的影响因素.该电极有良好的能斯特响应,斜率为63 mV/pC,线性范围为1.0×10-2～6.0×10-6mol/L,检出限为4.0×10-6 mol/L,适宜的pH范围为3.4～7.1.     

钨／氧化钨丝pH微电极的研制及应用

本文研制了钨/氧化钨丝pH微电极,电极在pH=2～12范围内对H~+的响应符合能斯特方程,斜率为55mV/pH(15℃)。该电极应用于人体托牙的基托处pH测定,结果令人满意。     

铅笔芯修饰聚苯胺制作微型复合pH电极的性能

在0.3mm直径的铅笔芯上电修饰聚苯胺,封入玻璃毛细管中,并与Ag/AgCl电极组合成复合微型pH电极.经实验测试,该电极的pH响应特性良好,在pH1～11的线性范围内,能斯特斜率为(-56.4±0.5)mV/pH,线性相关系数不小于0.996.作为参比的Ag/AgCl电极性能稳定.由于电极是复合微型化的,所以可用于活体微区测定.     

聚吡咯-肝素共聚膜修饰电极对钙离子的响应

研制了聚吡咯-肝素共聚膜修饰电极,并用电化学方法进行了表征。发现该修饰电极对钙离子呈Nernst响应,电极斜率为31.0 mV/pCa,线性范围是5.0×10^-7～5.0×10^-2 mol·L^-1,可用于儿童发样中钙的测定,结果满意,还测定了该修饰电极对其他阳离子的电位选择系数。     

以1,1,1-三(N-甲基-N_苯基氨基羰甲氧甲基)丙烷为载体的钙离子选择电极

报道了以三脚架化合物1,1,1_三 (N_甲基_N_苯基氨基羰甲氧甲基 )丙烷 (TMPP)为载体的钙离子选择电极的研制;探讨了增塑剂、载体浓度、pH等因素对电极性能的影响 ;结果表明电极对钙离子有较好的近能斯特响应 ,相应的斜率为27.6 mV/pcCa2+ ,线性响应范围为5×10-5 ～5×10-2 mol/L,检出限为2.3×10-5mol/L ;电极在pH4～13范围内具有强的抗干扰能力 ,并具有很好的重复性和稳定性 ;该电极作为钙离子选择电极 ,用于乳酸钙口服液中钙含量的测定 ,取得了满意的结果     

聚氯乙烯膜依诺沙星选择电极的研制与应用

以盐酸依诺沙星与四苯硼酸盐生成的分子缔合物制成新型PVC膜依诺沙星选择电极,应用于依诺沙星药片的含量测定。在pH 2.2～6.5范围内,电极的能斯特响应范围为5.0×10~(-5)～1.0×10~(-2)mol/L,斜率为58.0mV/pc,检出限为4.2×10~(-6)mol/L。该电极响应速度快,重现性好。3次测定的平均回收率为97.5％,RSD为1.0％,结果与紫外分光光度法基本一致。     

聚苯胺薄膜修饰电极对抗坏血酸的电催化氧化

本文表明聚苯胺(PAn)薄膜修饰电极对水溶液中的抗坏血酸(AH_2)在较宽的pH范围和较宽的浓度范围内均有良好的电催化氧化作用, 为EC平行催化过程。利用旋转圆盘电极(RDE)进行了催化过程动力学分析, 求出了催化反应动力学参数。在抗坏血酸浓度10~(-2)～10~(-6) mol·L~(-1)范围内, 催化峰电流与AH_2浓度均成良好的线性关系, 且PAn薄膜修饰电极具有很好的稳定性, 有应用分析抗坏血酸的意义。     

Electrocatalysis and determination of hydrazine compounds in liquid chromatography at a mixed-valent cobalt oxide/cyanocobaltate film electrode

A glassy carbon electrode coated with an electrodeposited film of mixed-valent cobalt oxide/cyanocobaltate (CoO/CNCo) enabled hydrazine compounds to be catalytically oxidized at the greatly reduced overpotential and in a wide operational pH range (pH 2.0-7.0). Electrocatalytic activity at the CoO/CNCo modified electrode was evaluated with respect to solution pH, film thickness, supporting electrolyte ions, potential scan rate, operating potential, concentration dependence and other variables. The CoO/CNCo film electrode was completely compatible with a conventional reversed-phase liquid chromatographic (RP-LC) system. Practical RP-LC amperometric detection (RP-LCEC) of hydrazines was performed. A dynamic linear response range over three orders of magnitude and a detection limit at the pmol level were readily obtained. The CoO/CNCO film electrode exhibited excellent electrocatalytic stability in the flowing streams.     

聚灿烂甲酚蓝修饰玻碳电极的制备及电化学性质

在含灿烂甲酚蓝的磷酸缓冲溶液中,用循环伏安法扫描.在经预处理的玻碳电极上形成了聚合物薄膜.在-0.7V-+0.9V(vsSCE)的扫描电位范围和弱碱性介质中形成的薄膜具有较高电活性和稳定性.制备好的聚灿烂甲酚蓝修饰电极在磷酸缓冲溶液的循环伏安曲线有两对氧化还原峰,峰电位随pH升高而向负电位方向移动.该电极对NADH的电化学氧化有催化作用,使其氧化电位负移了270mV并增大了氧化峰电流.     

磷钼杂多酸-L-半胱氨酸自组装超分子pH敏感膜电位传感器

自组装超分子膜;pH电位传感器;磷钼杂多酸-L-半胱氨酸自组装超分子pH敏感膜电位传感器     

胆红素LB膜的电化学行为研究

胆红素（BR）是存在于动物体内的一种重要生物物质，也是人和绝大多数哺乳动物体内血红蛋白等含铁卟啉化合物分解代谢的产物和代谢中间体。它是一种内源性抗氧化剂，对肝细胞的再生具有积极的作用，BR常以线状四吡咯或类卟啉结构的形式存在。胆红素及其金属配合物在水溶液犤１～６犦与有机介质（如DMF和DMSO）犤７～９犦中的电化学行为，文献上已有较多报道。前文犤１０～１２犦我们报道了胆红素可在不同亚相（酸性、中性及部分金属离子）表面形成Langmuir－Blodgett（LB膜）；在有磷脂存在时，其成膜性能更佳犤１３犦。由于LB膜同生…     

Direct electrochemistry and electrochemical catalysis of myoglobin-TiO2 coated multiwalled carbon nanotubes modified electrode

TiO(2) nanoparticles were homogeneously coated on multiwalled carbon nanotubes (MWCNTs) by hydrothermal deposition, and this nanocomposite might be a promising material for myoglobin (Mb) immobilization in view of its high biocompatibility and large surface. The glassy carbon (GC) electrode modified with Mb-TiO(2)/MWCNTs films exhibited a pair of well-defined, stable and nearly reversible cycle voltammetric peaks. The formal potential of Mb in TiO(2)/MWCNTs film was linearly varied in the range of pH 3-10 with a slope of 48.65 mV/pH, indicating that the electron transfer was accompanied by single proton transportation. The electron transfer between Mb and electrode surface, k(s) of 3.08 s(-1), was greatly facilitated in the TiO(2)/MWCNTs film. The electrocatalytic reductions of hydrogen peroxide were also studied, and the apparent Michaelis-Menten constant is calculated to be 83.10 microM, which shows a large catalytic activity of Mb in the TiO(2)/MWCNTs film to H(2)O(2). The modified GC electrode shows good analytical performance for amperometric determination of hydrogen peroxide. The resultant Mb-TiO(2)/MWCNTs modified glassy carbon electrode exhibited fast amperometric response to hydrogen peroxide reduction, long term life and excellent stability. Finally the activity of the sensor for nitric oxide reduction was also investigated.     

α-P2W17O10-61杂多阴离子薄膜修饰电极的制备

研究了杂多酸阴离子α－Ｐ２Ｗ１７Ｏ＾１０－６１修饰电极的制备及其化学性质,α－Ｐ２Ｗ１７Ｏ＾１０－６１修饰电极对ＢｒＯ＾－３具有催化作用。催化电流△Ｉｐ与「ＢｒＯ＾－３」在７．０＊１０＾－６－１．０＊１０＾－４ｍｏｌ／Ｌ范围内呈良好线性关系。用此电极测定了天然水中ＢｒＯ＾－３的含量,结果令人满意。     

电聚吡咯固定化酪氨酸酶电极的制备及性能

在应用恒电位法电化学聚合吡咯的同时 ,将酪氨酸酶固定在导电聚吡咯膜内 ,制成一种灵敏、稳定的酪氨酸电极 .讨论了溶液 pH值和聚合电位对酶固定化的影响 ,对酶分子嵌入吡咯膜前后的SEM图和CV曲线进行了分析、比较 .该电极对甲苯酚响应的线性范围为 5 .0× 10 -8～ 1.0× 10 -6mol/L ,最适 pH值为 6 .6 ,酶反应表观上遵循Michaelis_Menten动力学 ,表观米氏常数为 2 .2× 10 -5mol/L .     

Electrochemical analysis of d-penicillamine using a boron-doped diamond thin film electrode applied to flow injection system

The electroanalysis of d-penicillamine in 0.1 phosphate buffer (pH 7) was studied at a boron-doped diamond thin film (BDD) electrode using cyclic voltammetry as a function of concentration of analyte and pH of analyte solution. Comparison experiments were performing using a glassy carbon (GC) electrode. The BDD electrode exhibited a well-resolved and irreversible oxidation voltammogram, but the GC electrode provided only an ill-defined response. The BDD electrode provided a linear dynamic range from 0.5 to 10 mM and a detection limit of 25 muM (S/B>/=3) in voltammetric measurement. It was also found that the peak potentials were decreased when the pH of the analyte solution was increased. In addition, penicillamine has been studied by hydrodynamic voltammetry and flow injection analysis with amperometric detection using the BDD electrode. The flow injection analysis results at the diamond electrode indicated a linear dynamic range from 0.5 to 50 muM and a detection limit of 10 nM (S/N approximately 4). The proposed method was applied to determine d-penicillamine in dosage form (capsules), the results obtained in the recovery study (255+/-2.50 mg per tablet) were comparable to those labeled (250 mg per tablet).     

一步电沉积纳米铜/石墨烯/壳聚糖复合膜修饰玻碳电极测定邻苯二酚

用一步电沉积法制备了纳米铜/石墨烯/壳聚糖复合膜修饰玻碳电极。用循环伏安法(CV)和差分脉冲伏安法(DPV)对邻苯二酚在该修饰电极的电化学行为进行了研究。实验结果表明,在pH值为7.0的磷酸盐缓冲液(PBS)中,该修饰电极对邻苯二酚具有良好的电催化作用,其电化学信号与邻苯二酚的浓度在1.0×10-6～2.0×10-4mol/L范围内呈良好的线性关系,线性相关系数为0.991。检出限为1×10-7mol/L。结果表明,纳米铜/石墨烯/壳聚糖复合膜修饰电极显著提高了邻苯二酚的电化学响应信号,并表现出良好的选择性和重现性。该方法成功用于水样中邻苯二酚含量的测定。