Pub Date : 2020-10-27DOI: 10.5189/revpolarography.66.89
{"title":"65th Meeting of the Polarographic Society of Japan in Taipei","authors":"","doi":"10.5189/revpolarography.66.89","DOIUrl":"https://doi.org/10.5189/revpolarography.66.89","url":null,"abstract":"","PeriodicalId":305513,"journal":{"name":"Review of Polarography","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127994698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-27DOI: 10.5189/revpolarography.66.77
Y. Yokoyama, K. Miyazaki, T. Abe, K. Kano
The rotating disk electrode (RDE) technique is one of the most powerful methods for studying electrode reaction kinetics. Koutecký–Levich equation is frequently applied to the analysis of RDE curves of electrocatalytic reactions. Here, we take careful note of the negative aspect of the situation that the electrocatalytic kinetic-controlled current term in the equations is often expressed by Butler–Volmer-type equation. More rigid analytical expressions are proposed and some examples of the analysis of current– potential curves are also detailed by taking the oxygen reduction reaction.
{"title":"Study on the Analysis of the Current-potential Curve of RDE in Electrocatalytic Reactions","authors":"Y. Yokoyama, K. Miyazaki, T. Abe, K. Kano","doi":"10.5189/revpolarography.66.77","DOIUrl":"https://doi.org/10.5189/revpolarography.66.77","url":null,"abstract":"The rotating disk electrode (RDE) technique is one of the most powerful methods for studying electrode reaction kinetics. Koutecký–Levich equation is frequently applied to the analysis of RDE curves of electrocatalytic reactions. Here, we take careful note of the negative aspect of the situation that the electrocatalytic kinetic-controlled current term in the equations is often expressed by Butler–Volmer-type equation. More rigid analytical expressions are proposed and some examples of the analysis of current– potential curves are also detailed by taking the oxygen reduction reaction.","PeriodicalId":305513,"journal":{"name":"Review of Polarography","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132703950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-26DOI: 10.5189/revpolarography.66.13
Kohei Uematsu
Electroanalytical methods are known to be quite useful for various analyses of biologically relevant materials. The author has attempting to clarify the advantages of electroanalytical methods and to elucidate the functions and properties of biological samples using electrochemical methods. This paper provides an overview of the author’s electrochemical studies focusing on oxidoreductases and polyamino compounds.
{"title":"Bioelectrochemical Studies on Oxidoreductases and Natural Polyamino Compounds","authors":"Kohei Uematsu","doi":"10.5189/revpolarography.66.13","DOIUrl":"https://doi.org/10.5189/revpolarography.66.13","url":null,"abstract":"Electroanalytical methods are known to be quite useful for various analyses of biologically relevant materials. The author has attempting to clarify the advantages of electroanalytical methods and to elucidate the functions and properties of biological samples using electrochemical methods. This paper provides an overview of the author’s electrochemical studies focusing on oxidoreductases and polyamino compounds.","PeriodicalId":305513,"journal":{"name":"Review of Polarography","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127102361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-26DOI: 10.5189/revpolarography.66.31
T. Ozeki
English Abstract: In this report, two applications of chemometrics to electroanalytical chemistry are presented. In addition to potential and electric current, other information such as heat evolution of electrode reaction or Raman spectral peak analysis of specific species gives many useful information to figure out reactions and species. The electrochemical heat evolution is related to the entropy change of the reaction so that two different electrochemical reactions with different entropy change can be easily separated. But, a quantity we measure is temperature change of the electrode, which is delayed from real heat evolution due to heat capacity and so on. So the measured temperature change has to be deconvoluted to the true heat evolution by a mathematical method using the delay function. Another example of the deconvolution technique is to measure the Raman spectral peak of specific species to estimate its spatial change of the concentration in solution from the electrode surface by using a focal depth profile of the objective lens used in Raman microscope technique as a window function.
{"title":"Application of chemometrics to electroanalytical chemistry","authors":"T. Ozeki","doi":"10.5189/revpolarography.66.31","DOIUrl":"https://doi.org/10.5189/revpolarography.66.31","url":null,"abstract":"English Abstract: In this report, two applications of chemometrics to electroanalytical chemistry are presented. In addition to potential and electric current, other information such as heat evolution of electrode reaction or Raman spectral peak analysis of specific species gives many useful information to figure out reactions and species. The electrochemical heat evolution is related to the entropy change of the reaction so that two different electrochemical reactions with different entropy change can be easily separated. But, a quantity we measure is temperature change of the electrode, which is delayed from real heat evolution due to heat capacity and so on. So the measured temperature change has to be deconvoluted to the true heat evolution by a mathematical method using the delay function. Another example of the deconvolution technique is to measure the Raman spectral peak of specific species to estimate its spatial change of the concentration in solution from the electrode surface by using a focal depth profile of the objective lens used in Raman microscope technique as a window function.","PeriodicalId":305513,"journal":{"name":"Review of Polarography","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129230792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-26DOI: 10.5189/revpolarography.66.23
Akira Kotani
Determinations of bioactive compounds were carried out by various electrochemical detections (ECDs) hyphenated with high-performance liquid chromatography (HPLC-ECD) systems. An HPLC-ECD using a capillary column (0.2 mm i.d.) achieved determinations of catechins at femtogram levels. A three-channels HPLC-ECD using a column switching technique provided to the simultaneous determination of caffeoylquinic acids and flavonoids in Chrysanthemum morifolium flowers. HPLC-ECD systems by the means of reduction of 3,5-di- tert -butyl-1,2-benzoquinone and oxidation of trolox were developed to determine polyunsaturated fatty acids and theophylline in plasma, respectively. These HPLC-ECD systems with sensitivity and precision produced a practically useful method for the analyses of biological and herbal medicine samples.
{"title":"Determination of Bioactive Compounds by Highly Sensitive Electrochemical Detection in Liquid Chromatography","authors":"Akira Kotani","doi":"10.5189/revpolarography.66.23","DOIUrl":"https://doi.org/10.5189/revpolarography.66.23","url":null,"abstract":"Determinations of bioactive compounds were carried out by various electrochemical detections (ECDs) hyphenated with high-performance liquid chromatography (HPLC-ECD) systems. An HPLC-ECD using a capillary column (0.2 mm i.d.) achieved determinations of catechins at femtogram levels. A three-channels HPLC-ECD using a column switching technique provided to the simultaneous determination of caffeoylquinic acids and flavonoids in Chrysanthemum morifolium flowers. HPLC-ECD systems by the means of reduction of 3,5-di- tert -butyl-1,2-benzoquinone and oxidation of trolox were developed to determine polyunsaturated fatty acids and theophylline in plasma, respectively. These HPLC-ECD systems with sensitivity and precision produced a practically useful method for the analyses of biological and herbal medicine samples.","PeriodicalId":305513,"journal":{"name":"Review of Polarography","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126539801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-26DOI: 10.5189/revpolarography.66.41
Masahiro Yamamoto (ed)
{"title":"That’s the Thing in Electroanalytical Chemistry! (Part 5)","authors":"Masahiro Yamamoto (ed)","doi":"10.5189/revpolarography.66.41","DOIUrl":"https://doi.org/10.5189/revpolarography.66.41","url":null,"abstract":"","PeriodicalId":305513,"journal":{"name":"Review of Polarography","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115927194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-26DOI: 10.5189/revpolarography.66.1
T. Sagara
{"title":"Time and Scientific Discussion","authors":"T. Sagara","doi":"10.5189/revpolarography.66.1","DOIUrl":"https://doi.org/10.5189/revpolarography.66.1","url":null,"abstract":"","PeriodicalId":305513,"journal":{"name":"Review of Polarography","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124673206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-26DOI: 10.5189/revpolarography.66.5
A. Uehara
A fundamental analysis of a metal reduction process is important for the development on metal plating, electric refining, and nanoparticle synthesis. Electrochemical and spectroelectrochemical methods have been applied for the mechanistic analysis of the noble metal nanoparticles formation as well as the actinide reduction. Ionic species and electron transfer reactions at the interface between aqueous and organic solutions were measured by charge transfer voltammetry at the liquid|liquid interface. Chemical status and redox characteristics of actinide ions in various solutions such as water, organic solutions, molten salts, highly concentrated electrolytes were studied by electrochemical methods combined with in-situ X-ray absorption spectroscopy.
{"title":"Spectroelectrochemical Study on Reduction Processes of Noble Metal and Actinide Ions","authors":"A. Uehara","doi":"10.5189/revpolarography.66.5","DOIUrl":"https://doi.org/10.5189/revpolarography.66.5","url":null,"abstract":"A fundamental analysis of a metal reduction process is important for the development on metal plating, electric refining, and nanoparticle synthesis. Electrochemical and spectroelectrochemical methods have been applied for the mechanistic analysis of the noble metal nanoparticles formation as well as the actinide reduction. Ionic species and electron transfer reactions at the interface between aqueous and organic solutions were measured by charge transfer voltammetry at the liquid|liquid interface. Chemical status and redox characteristics of actinide ions in various solutions such as water, organic solutions, molten salts, highly concentrated electrolytes were studied by electrochemical methods combined with in-situ X-ray absorption spectroscopy.","PeriodicalId":305513,"journal":{"name":"Review of Polarography","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129326714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-05DOI: 10.5796/ELECTROCHEMISTRY.19-6-E2676
K. Kano
Electrochemical coupling of redox enzyme reactions, called bioelectrocatalysis, has been attracting great attention over the last four decades. It has become an important technology that can be applied to a wide range of bioelectrochemical devices including biosensors, biofuel cells, and bioreactors. This article presents an overview of the basic concepts of steady-state catalytic waves of mediated- and direct electron transfer (DET)-type bioelectrocatalysis. Several equations that can be used for the analysis of steady-state waves are introduced. The analysis may provide important thermodynamic and kinetic parameters that can be used not only for performance evaluation of the devices but also for fundamental research on the enzymes. Important progress made on how to tune electrode surfaces and enzymes for DET-type reactions are presented. Applications to bioelectrochemical devices are also summarized with emphasis on the achievements recorded in our research group.
{"title":"Fundamentals and Applications of Redox Enzyme-Functionalized Electrode Reactions","authors":"K. Kano","doi":"10.5796/ELECTROCHEMISTRY.19-6-E2676","DOIUrl":"https://doi.org/10.5796/ELECTROCHEMISTRY.19-6-E2676","url":null,"abstract":"Electrochemical coupling of redox enzyme reactions, called bioelectrocatalysis, has been attracting great attention over the last four decades. It has become an important technology that can be applied to a wide range of bioelectrochemical devices including biosensors, biofuel cells, and bioreactors. This article presents an overview of the basic concepts of steady-state catalytic waves of mediated- and direct electron transfer (DET)-type bioelectrocatalysis. Several equations that can be used for the analysis of steady-state waves are introduced. The analysis may provide important thermodynamic and kinetic parameters that can be used not only for performance evaluation of the devices but also for fundamental research on the enzymes. Important progress made on how to tune electrode surfaces and enzymes for DET-type reactions are presented. Applications to bioelectrochemical devices are also summarized with emphasis on the achievements recorded in our research group.","PeriodicalId":305513,"journal":{"name":"Review of Polarography","volume":"24 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116692875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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