化学修饰电极及其在环境分析中的应用研究
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摘要
氨基酸是生物体的最基本物质，又因含有氨基和羧基两种官能团而具有许多独特的性质，利用化学方法或电化学方法将氨基酸修饰到电极表面，在测定金属离子、生物分子、有机污染物等方面显示了其独特的优越性。
化学修饰电极是当前电化学、电分析化学方面十分活跃的领域。它最突出的特性是，按人们意图设计，在电极表面连接或涂敷了一层具有选择性化学基团的薄膜。修饰电极赋予了电极某种预定的功能，能够提高测定的灵敏度与选择性。
论文研究了对甲基苯磺酸在玻碳电极上电化学聚合的条件及修饰电极的电化学特性，实验表明在该修饰电极上对多巴胺(Dopamine，DA)和抗坏血酸(Ascorbic acid，AA)均具有良好的电催化效果，并且实现了对多巴胺与抗坏血酸的同时测定，得到满意结果。
论文分别以天冬氨酸、谷氨酸、苯丙氨酸为修饰材料，用电聚合的方法制备了三种氨基酸类修饰电极。并用所制备的修饰电极作了环境中的对苯酚和邻苯酚的测定研究。通过修饰前后的玻碳电极比较，表明修饰后的电极提高了测定的灵敏度，而且所制备的三种氨基酸类修饰电极都能消除对苯酚(Hydroquinone，HQ)氧化电流对邻苯酚(Catechol，CC)氧化电流的干扰，可以实现对HQ和CC的同时测定。当三种修饰电极分别应用于合成水样中HQ和CC的同时测定时，具有较高的灵敏度和选择性。
论文在用微脉冲伏安法实现多巴胺与抗坏血酸的同时测定及水样中对苯酚和邻苯酚的同时测定方面有创新，并得到满意结果。
论文还研究了氨基酸分子结构对同时测定对苯酚和邻苯酚的影响，结果表明，氨基酸的分子结构对电催化效应的影响不显著。
Amino acid is the most essential matter in biological body, which has some specialcharacters for having amino group and carboxyl. Amino acid can be modified on the electrodeby chemical way or electrochemical way. The modified electrodes are applied for thedetermination of metal ion, biological molecule, organic pollutant and so on, which showssome special advantages.
Chemically modified electrode is currently an active area of research. It can be designedaccording to our demand, and have shown splendid prospects in sensitivity and selectivity.
In this paper, the polymerization condition of p-toluene sulfonic acid at glassy carbonelectrode and the electrochemical characeristics of the modified electrode had beeninvestigated. It was found that the the polymer showed strong electrocatalytic effects onoxidation of Dopamine (DA) and Ascorbic acid (AA). In differential pulse votammetric(DPV) measurements, the poly(p-toluene sulfonic acid) film modified electrode can separatethe DA and AA oxidation potentials by about 192mV and can be used to the simultaneousdetermination of DA and AA. The electrode shows excellent sensitivity, good selectivity andantifouling properties.
In the paper, Glassy carbon electrode (GCE) was modified with electropolymerized filmsof poly (aspartic acid) (p-Asp), poly (glutamic acid) (p-Glu) and poly (phenylalanine) (p-Phe),respectively. These three kinds of polymer-modified electrodes (PMEs) were used tosimultaneous electrochemical determination of hydroquinone (HQ) and catechol (CC) andshow an excellent electrocatalytical effect on the oxidation of HQ and CC. A successfulelimination of the fouling effect by the oxidized product of HQ on the response of CC hasbeen achieved at these polymer-modified electrodes. The proposed three kinds ofpolymer-modified electrodes had been applied to simultaneous determination of HQ and CCin a water sample with simplicity and high selectivity.
Also, we had studied that the structure of the amino acid affected on the oxidation of HQand CC. The result showed that the structure of the amino acid had no obvious effects on theelectrocatalysis of HQ and CC.
化学修饰电极是当前电化学、电分析化学方面十分活跃的领域。它最突出的特性是，按人们意图设计，在电极表面连接或涂敷了一层具有选择性化学基团的薄膜。修饰电极赋予了电极某种预定的功能，能够提高测定的灵敏度与选择性。
论文研究了对甲基苯磺酸在玻碳电极上电化学聚合的条件及修饰电极的电化学特性，实验表明在该修饰电极上对多巴胺(Dopamine，DA)和抗坏血酸(Ascorbic acid，AA)均具有良好的电催化效果，并且实现了对多巴胺与抗坏血酸的同时测定，得到满意结果。
论文分别以天冬氨酸、谷氨酸、苯丙氨酸为修饰材料，用电聚合的方法制备了三种氨基酸类修饰电极。并用所制备的修饰电极作了环境中的对苯酚和邻苯酚的测定研究。通过修饰前后的玻碳电极比较，表明修饰后的电极提高了测定的灵敏度，而且所制备的三种氨基酸类修饰电极都能消除对苯酚(Hydroquinone，HQ)氧化电流对邻苯酚(Catechol，CC)氧化电流的干扰，可以实现对HQ和CC的同时测定。当三种修饰电极分别应用于合成水样中HQ和CC的同时测定时，具有较高的灵敏度和选择性。
论文在用微脉冲伏安法实现多巴胺与抗坏血酸的同时测定及水样中对苯酚和邻苯酚的同时测定方面有创新，并得到满意结果。
论文还研究了氨基酸分子结构对同时测定对苯酚和邻苯酚的影响，结果表明，氨基酸的分子结构对电催化效应的影响不显著。
Amino acid is the most essential matter in biological body, which has some specialcharacters for having amino group and carboxyl. Amino acid can be modified on the electrodeby chemical way or electrochemical way. The modified electrodes are applied for thedetermination of metal ion, biological molecule, organic pollutant and so on, which showssome special advantages.
Chemically modified electrode is currently an active area of research. It can be designedaccording to our demand, and have shown splendid prospects in sensitivity and selectivity.
In this paper, the polymerization condition of p-toluene sulfonic acid at glassy carbonelectrode and the electrochemical characeristics of the modified electrode had beeninvestigated. It was found that the the polymer showed strong electrocatalytic effects onoxidation of Dopamine (DA) and Ascorbic acid (AA). In differential pulse votammetric(DPV) measurements, the poly(p-toluene sulfonic acid) film modified electrode can separatethe DA and AA oxidation potentials by about 192mV and can be used to the simultaneousdetermination of DA and AA. The electrode shows excellent sensitivity, good selectivity andantifouling properties.
In the paper, Glassy carbon electrode (GCE) was modified with electropolymerized filmsof poly (aspartic acid) (p-Asp), poly (glutamic acid) (p-Glu) and poly (phenylalanine) (p-Phe),respectively. These three kinds of polymer-modified electrodes (PMEs) were used tosimultaneous electrochemical determination of hydroquinone (HQ) and catechol (CC) andshow an excellent electrocatalytical effect on the oxidation of HQ and CC. A successfulelimination of the fouling effect by the oxidized product of HQ on the response of CC hasbeen achieved at these polymer-modified electrodes. The proposed three kinds ofpolymer-modified electrodes had been applied to simultaneous determination of HQ and CCin a water sample with simplicity and high selectivity.
Also, we had studied that the structure of the amino acid affected on the oxidation of HQand CC. The result showed that the structure of the amino acid had no obvious effects on theelectrocatalysis of HQ and CC.
引文
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