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Voltammetric Simultaneous Quantification of Lapachone Isomers In Plant Extracts Using Graphite–Epoxy Composite Electrode 石墨-环氧复合电极伏安法同时定量植物提取物中拉帕酮异构体
IF 2.7 3区 化学
Electroanalysis Pub Date : 2025-02-07 DOI: 10.1002/elan.12023
Joseany M. S. Almeida, Andrea R. da Silva, Ana Beatriz O. Azevedo, Marlin J. Pedrozo-Peñafiel, Carlos A. T. Toloza, Ricardo Q. Aucélio
{"title":"Voltammetric Simultaneous Quantification of Lapachone Isomers In Plant Extracts Using Graphite–Epoxy Composite Electrode","authors":"Joseany M. S. Almeida,&nbsp;Andrea R. da Silva,&nbsp;Ana Beatriz O. Azevedo,&nbsp;Marlin J. Pedrozo-Peñafiel,&nbsp;Carlos A. T. Toloza,&nbsp;Ricardo Q. Aucélio","doi":"10.1002/elan.12023","DOIUrl":"https://doi.org/10.1002/elan.12023","url":null,"abstract":"<p>The method developed for the determination of lapachone isomers (<i>α</i>- and <i>β</i>-lapachones) involves the use of square wave voltammetry (SWV) with an electrode based on epoxy–graphite composite. The electrolytic aqueous solution contained a cationic surfactant (CTAB), phosphate buffer (pH 6.0), and KNO<sub>3</sub>. The addition of CTAB enhanced analyte diffusion into the electrode–solution interface, improving detection through SWV. Under chosen conditions, <i>β</i>-lapachone and <i>α</i>-lapachone respectively present reversible and quasireversible processes. The analytical signals were detected at the specific potentials of −370 mV (<i>α</i>-lapachone) and −190 mV (<i>β</i>-lapachone) using 140 s preconcentration at +400 mV. The SWV parameters used include 30 Hz frequency, 40 mV pulse amplitude, and 20 mV potential step. Instrumental detection limits were 2.4 × 10<sup>−7</sup> mol L<sup>−1</sup> and 1.4 × 10<sup>−7</sup> mol L<sup>−1</sup> respectively for <i>α</i>-lapachone and <i>β</i>-lapachone. Lapachol and, in a lesser extent, sulfonated <i>β</i>-lapachone interfere with both analyte signals, requiring liquid–liquid extraction prior to the determination of <i>α</i>-lapachone and <i>β</i>-lapachone in ethanolic plant (heartwood of the <i>Tabebuia impetiginosa</i>) extract. The results obtained using SWV agreed with those achieved by high-performance liquid chromatography.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 2","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Methyl Viologen as a Redox Mediator for Scanning Electrochemical Microscopy to Study Copper Corrosion Under Deaerated Conditions 甲基紫素作为氧化还原介质的扫描电化学显微镜研究铜在脱氧条件下的腐蚀
IF 2.7 3区 化学
Electroanalysis Pub Date : 2025-02-07 DOI: 10.1002/elan.12016
Emmanuel Mena-Morcillo, Reza Moshrefi, Mehran Behazin, Peter George Keech, Samantha Michelle Gateman
{"title":"Methyl Viologen as a Redox Mediator for Scanning Electrochemical Microscopy to Study Copper Corrosion Under Deaerated Conditions","authors":"Emmanuel Mena-Morcillo,&nbsp;Reza Moshrefi,&nbsp;Mehran Behazin,&nbsp;Peter George Keech,&nbsp;Samantha Michelle Gateman","doi":"10.1002/elan.12016","DOIUrl":"https://doi.org/10.1002/elan.12016","url":null,"abstract":"<p>Scanning electrochemical microscopy (SECM) is a popular tool to study corrosion with high spatial resolution. The feedback mode of SECM involves the use of an added redox mediator in solution to probe local surface kinetics. Depending on the redox mediator's oxidation state and formal potential, as well as the corroding metal's corrosion potential, the electroactive species can potentially polarize the substrate and alter the corrosion behavior at the macro and/or microscale. Therefore, the choice of redox mediator is material dependent. This study explored the use of methyl viologen (MV) as a potentially ideal redox mediator for studying the local reactivity of copper. The SECM solutions were deaerated prior to SECM approach curve measurements to avoid a convoluted response from the oxygen reduction reaction at the ultramicroelectrode. Since the formal potential of MV is lower than the corrosion potential of Cu and undergoes oxidation to regenerate at the substrate's surface, the redox mediator was successfully implemented for kinetic measurements without inducing oxidative etching, ultramicroelectrode fouling, or macroscale corrosion. This work highlights the importance of redox mediator choice for SECM corrosion studies to avoid misinterpretation of data and provides a systematic method of making such decision for accurate measurements.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 2","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/elan.12016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electrochemical Monitoring of the Impact of Antibiotic Agents on Pseudomonas aeruginosa Phenazine Metabolite Production Rates 抗生素对铜绿假单胞菌非那嗪代谢物产率影响的电化学监测
IF 2.7 3区 化学
Electroanalysis Pub Date : 2025-02-07 DOI: 10.1002/elan.12021
Olivia M. Clay, Courtney J. Weber, Richard S. Anum, Olja Simoska
{"title":"Electrochemical Monitoring of the Impact of Antibiotic Agents on Pseudomonas aeruginosa Phenazine Metabolite Production Rates","authors":"Olivia M. Clay,&nbsp;Courtney J. Weber,&nbsp;Richard S. Anum,&nbsp;Olja Simoska","doi":"10.1002/elan.12021","DOIUrl":"https://doi.org/10.1002/elan.12021","url":null,"abstract":"&lt;p&gt;&lt;i&gt;Pseudomonas aeruginosa&lt;/i&gt; is an opportunistic pathogen responsible for a high percentage of nosocomial infections, particularly posing a threat to immunocompromised patients. The increased use of antibacterial agents has led to the emergence of antibiotic resistance mechanisms in this pathogen, exacerbating challenges in treating &lt;i&gt;P. aeruginosa&lt;/i&gt; infections. Previous studies have correlated the endogenous production of phenazines in &lt;i&gt;P. aeruginosa&lt;/i&gt; to the development of antibiotic resistance in the bacterium. Phenazines are nitrogen-containing heterocyclic compounds endogenously produced by &lt;i&gt;P. aeruginosa&lt;/i&gt; as redox-active biogenic signaling molecules during early infection stages. While several studies have provided qualitative insights into the effects of different antibiotics on &lt;i&gt;P. aeruginosa&lt;/i&gt; growth, quantitative reports on the changes in &lt;i&gt;P. aeruginosa&lt;/i&gt; cellular communication and metabolite production dynamics following antibiotic exposure are limited. Addressing this knowledge gap, this study reports real-time electrochemical quantification of phenazine virulence metabolites in both wild-type PA14 and clinical PA2114 strains of &lt;i&gt;P. aeruginosa&lt;/i&gt; with varying levels of antibiotic resistance. Specifically, the impact of antibacterial agent ciprofloxacin (CIP) at different concentrations (0, 0.05, and 1 mg L&lt;sup&gt;−1&lt;/sup&gt; CIP) on phenazine production in these &lt;i&gt;P. aeruginosa&lt;/i&gt; strains was electrochemically monitored directly from bacterial cultures over a 48-h period. Square-wave voltammetry was utilized for quantitative monitoring of two phenazines, namely pyocyanin (PYO) and 5-methylphenazine-1-carboxylic acid (5-MCA), correlating electrical current signal at a unique redox potential to the phenazine concentration. The results indicate distinct phenazine redox responses of the clinical isolate PA2114 strain and wild-type PA14 strain due to antibiotic stress. Under optimal cell growth conditions without CIP exposure, the PA2114 strain with higher antibiotic resistance produced increasing PYO concentrations over 48 h, peaking at 84 ± 9 μM PYO. In contrast, the PYO levels produced by the wild-type strain plateaued and decreased after 24 h of growth, reaching a maximum PYO concentration of 65 ± 3 μM. Exposure to 0.05 mg L&lt;sup&gt;−1&lt;/sup&gt; CIP led to marginally higher PYO concentrations in the clinical strain (88 ± 9 μM) while the wild-type strain displayed a notable decrease in PYO concentration (54 ± 4 μM). Additionally, cellular growth with 1 mg L&lt;sup&gt;−1&lt;/sup&gt; CIP resulted in a decreased maximum PYO concentration for the clinical strain (70 ± 3 μM) and a substantially decreased PYO concentration for the wild-type strain (11 ± 5 μM). These differences in PYO production are attributed to distinctive changes in phenazine biosynthesis dynamics in different &lt;i&gt;P. aeruginosa&lt;/i&gt; strains and the addition of CIP. Furthermore, this study shows the monitoring of phenazine biosynthesis dynamics through the detection of the","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 2","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Novel Electrochemical Platform Based on Cadmium (II) (fluorophenyl)Porphyrin and Gold Nanoparticles Modified Screen-Printed Electrode Electrode for the Sensitive Detection of Bisphenol A 基于镉(II)(氟苯基)卟啉和金纳米颗粒修饰的丝网印刷电极的新型电化学平台用于双酚A的灵敏检测
IF 2.7 3区 化学
Electroanalysis Pub Date : 2025-02-07 DOI: 10.1002/elan.12017
Fatma Rejab, Nour Elhouda Dardouri, Ahlem Rouis, Mosaab Echabaane, Habib Nasri, Hamdi Ben Halima, Nicole Jaffrezic-Renault
{"title":"A Novel Electrochemical Platform Based on Cadmium (II) (fluorophenyl)Porphyrin and Gold Nanoparticles Modified Screen-Printed Electrode Electrode for the Sensitive Detection of Bisphenol A","authors":"Fatma Rejab,&nbsp;Nour Elhouda Dardouri,&nbsp;Ahlem Rouis,&nbsp;Mosaab Echabaane,&nbsp;Habib Nasri,&nbsp;Hamdi Ben Halima,&nbsp;Nicole Jaffrezic-Renault","doi":"10.1002/elan.12017","DOIUrl":"https://doi.org/10.1002/elan.12017","url":null,"abstract":"<p>Bisphenol A (BPA) is categorized as an endocrine-disrupting substance; it is a risky substance to both environmental and human health, necessitating monitoring. In this present study, a novel electrochemical sensing platform based on Cd metalloporphyrin ([(5,10,15,20- tetrakis(p-flurophenyl) porphyrinato] cadmium (II) [CdTFPP]) and gold nanoparticles (AuNPs) for a rapid and sensitive determination of BPA was designed. To confirm the successful synthesis of CdTFPP, UV/vis, IR, and <sup>1</sup>H NMR were employed. The detection platform CdTFPP/AuNPs/SPCE was prepared using a screen-printed electrode (SPCE), through the deposition of AuNPs and CdTFPP by drop-casting. Under optimized measuring conditions, the developed sensor exhibited two linear ranges from 10<sup>−10</sup> to 10<sup>−7</sup> M and 10<sup>−7</sup> to 10<sup>−2</sup> M with a limit of detection of 133 pM. Additionally, the CdTFPP/AuNPs/SPCE/ electrode demonstrated to present an excellent selectivity and reproducibility and to be a promising tool for the development of simple low-cost water quality monitoring system for BPA detection.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 2","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Selective Electrochemical Sensing of Sunset Yellow in Beverages Based on Synergistic Signal Amplification of HKUST1 and MWCNTs 基于HKUST1和MWCNTs协同信号放大的饮料中日落黄选择性电化学传感
IF 2.7 3区 化学
Electroanalysis Pub Date : 2025-02-07 DOI: 10.1002/elan.12020
Khethiwe Mthiyane, Gloria Ebube Uwaya, Krishna Bisetty
{"title":"Selective Electrochemical Sensing of Sunset Yellow in Beverages Based on Synergistic Signal Amplification of HKUST1 and MWCNTs","authors":"Khethiwe Mthiyane,&nbsp;Gloria Ebube Uwaya,&nbsp;Krishna Bisetty","doi":"10.1002/elan.12020","DOIUrl":"https://doi.org/10.1002/elan.12020","url":null,"abstract":"<p>In this study, a highly selective electrooxidation method for sunset yellow (SY) detection in real food samples is presented on the basis of the integration of HKUST1 with multiwalled carbon nanotubes (MWCNTs) doped on a glassy carbon electrode (GCE). Cyclic voltammetry measurements of the HKUST-1-MWCNT-composite electrode revealed enhanced sensitivity for SY with a distinct redox peak potential of approximately 0.6 V, which was attributed to the highly active surface of the electrode. This response was notably more pronounced than those of tartrazine, allura red and amaranth. Electrochemical impedance spectroscopy analysis revealed a low charge transfer resistance (<i>R</i><sub>ct</sub>) for the GCE-HKUST-1-MWCNT electrode, indicating that the integration of HKUST−1 and MWCNTs significantly enhanced the electrical conductivity. In addition, Monte Carlo simulations revealed that a single copper paddle wheel (the secondary building unit of HKUST−1) greatly enhanced the dispersion of the MWCNTs within the matrix. Notably, revealing that the preferred adsorption site of SY was within the inner surface of the MWCNTs, leading to signal amplification. Overall, the sensor achieved limits of detection and limits of quantification of 1.03 and 3.44 μM, respectively, within a defined linear dynamic range. Furthermore, the sensor demonstrated strong practical applicability in real sample analysis, with an excellent recovery rate ranging from 83.11 to 114%. This sensing technique shows great promise for the selective monitoring and detection of synthetic colourants in the food sector.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 2","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/elan.12020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Selective Electrochemical Sensing of Sunset Yellow in Beverages Based on Synergistic Signal Amplification of HKUST1 and MWCNTs 基于HKUST1和MWCNTs协同信号放大的饮料中日落黄选择性电化学传感
IF 2.7 3区 化学
Electroanalysis Pub Date : 2025-02-07 DOI: 10.1002/elan.12020
Khethiwe Mthiyane, Gloria Ebube Uwaya, Krishna Bisetty
{"title":"Selective Electrochemical Sensing of Sunset Yellow in Beverages Based on Synergistic Signal Amplification of HKUST1 and MWCNTs","authors":"Khethiwe Mthiyane,&nbsp;Gloria Ebube Uwaya,&nbsp;Krishna Bisetty","doi":"10.1002/elan.12020","DOIUrl":"https://doi.org/10.1002/elan.12020","url":null,"abstract":"<p>In this study, a highly selective electrooxidation method for sunset yellow (SY) detection in real food samples is presented on the basis of the integration of HKUST1 with multiwalled carbon nanotubes (MWCNTs) doped on a glassy carbon electrode (GCE). Cyclic voltammetry measurements of the HKUST-1-MWCNT-composite electrode revealed enhanced sensitivity for SY with a distinct redox peak potential of approximately 0.6 V, which was attributed to the highly active surface of the electrode. This response was notably more pronounced than those of tartrazine, allura red and amaranth. Electrochemical impedance spectroscopy analysis revealed a low charge transfer resistance (<i>R</i><sub>ct</sub>) for the GCE-HKUST-1-MWCNT electrode, indicating that the integration of HKUST−1 and MWCNTs significantly enhanced the electrical conductivity. In addition, Monte Carlo simulations revealed that a single copper paddle wheel (the secondary building unit of HKUST−1) greatly enhanced the dispersion of the MWCNTs within the matrix. Notably, revealing that the preferred adsorption site of SY was within the inner surface of the MWCNTs, leading to signal amplification. Overall, the sensor achieved limits of detection and limits of quantification of 1.03 and 3.44 μM, respectively, within a defined linear dynamic range. Furthermore, the sensor demonstrated strong practical applicability in real sample analysis, with an excellent recovery rate ranging from 83.11 to 114%. This sensing technique shows great promise for the selective monitoring and detection of synthetic colourants in the food sector.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 2","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/elan.12020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Additive Manufacturing Electrochemistry: Development of Bismuth Oxide Microparticle Filament for Lead (II) Detection 增材制造电化学:用于铅(II)检测的氧化铋微粒灯丝的开发
IF 2.7 3区 化学
Electroanalysis Pub Date : 2025-02-07 DOI: 10.1002/elan.12019
Enyioma C. Okpara, Robert D. Crapnell, Elena Bernalte, Olanrewaju B. Wojuola, Craig E. Banks
{"title":"Additive Manufacturing Electrochemistry: Development of Bismuth Oxide Microparticle Filament for Lead (II) Detection","authors":"Enyioma C. Okpara,&nbsp;Robert D. Crapnell,&nbsp;Elena Bernalte,&nbsp;Olanrewaju B. Wojuola,&nbsp;Craig E. Banks","doi":"10.1002/elan.12019","DOIUrl":"https://doi.org/10.1002/elan.12019","url":null,"abstract":"<p>Accurate, rapid, and cost-effective validation of water quality is essential to ensure that the World Health Organization's (WHO) standards are met and that the United Nations Sustainable Development Goal 6—Clean Water and Sanitation is achieved. To this end, the development of additive-manufactured electrodes using recycled polylactic acid, nanocarbon black, and micro-sized bismuth oxide is reported. These electrodes, that are fabricated using a thermal mixing approach, can be customized to incorporate varying amounts of bismuth oxide (1, 2.5, and 5 wt%) maintaining the integrity of the base polymer. The electrodes developed in this work demonstrate significant potential for the electrochemical detection of lead (II) within water, achieving limits of detection of 0.79, 0.93, and 4.29 μg L<sup>−1</sup> (3<i>σ</i>), for the 1, 2.5, and 5 wt% bismuth oxide sensors, respectively. These detection limits are notably below the WHO recommended threshold of 10 μg L<sup>−1</sup> for lead in domestic water and even achieve the 2036 European Union targets of 5 μg L<sup>−1</sup>. The 2.5 wt% bismuth oxide electrodes exhibit excellent reproducibility and specificity, achieving average recovery rates of 98.28% and 100.15% in the analysis of spiked lead (II) samples in deionized and condensed atmospheric water, respectively. This approach is further validated against inductively coupled plasma mass spectroscopy measurements.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 2","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/elan.12019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Additive Manufacturing Electrochemistry: Development of Bismuth Oxide Microparticle Filament for Lead (II) Detection 增材制造电化学:用于铅(II)检测的氧化铋微粒灯丝的开发
IF 2.7 3区 化学
Electroanalysis Pub Date : 2025-02-07 DOI: 10.1002/elan.12019
Enyioma C. Okpara, Robert D. Crapnell, Elena Bernalte, Olanrewaju B. Wojuola, Craig E. Banks
{"title":"Additive Manufacturing Electrochemistry: Development of Bismuth Oxide Microparticle Filament for Lead (II) Detection","authors":"Enyioma C. Okpara,&nbsp;Robert D. Crapnell,&nbsp;Elena Bernalte,&nbsp;Olanrewaju B. Wojuola,&nbsp;Craig E. Banks","doi":"10.1002/elan.12019","DOIUrl":"https://doi.org/10.1002/elan.12019","url":null,"abstract":"<p>Accurate, rapid, and cost-effective validation of water quality is essential to ensure that the World Health Organization's (WHO) standards are met and that the United Nations Sustainable Development Goal 6—Clean Water and Sanitation is achieved. To this end, the development of additive-manufactured electrodes using recycled polylactic acid, nanocarbon black, and micro-sized bismuth oxide is reported. These electrodes, that are fabricated using a thermal mixing approach, can be customized to incorporate varying amounts of bismuth oxide (1, 2.5, and 5 wt%) maintaining the integrity of the base polymer. The electrodes developed in this work demonstrate significant potential for the electrochemical detection of lead (II) within water, achieving limits of detection of 0.79, 0.93, and 4.29 μg L<sup>−1</sup> (3<i>σ</i>), for the 1, 2.5, and 5 wt% bismuth oxide sensors, respectively. These detection limits are notably below the WHO recommended threshold of 10 μg L<sup>−1</sup> for lead in domestic water and even achieve the 2036 European Union targets of 5 μg L<sup>−1</sup>. The 2.5 wt% bismuth oxide electrodes exhibit excellent reproducibility and specificity, achieving average recovery rates of 98.28% and 100.15% in the analysis of spiked lead (II) samples in deionized and condensed atmospheric water, respectively. This approach is further validated against inductively coupled plasma mass spectroscopy measurements.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 2","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/elan.12019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Novel Electrochemical Platform Based on Cadmium (II) (fluorophenyl)Porphyrin and Gold Nanoparticles Modified Screen-Printed Electrode Electrode for the Sensitive Detection of Bisphenol A 基于镉(II)(氟苯基)卟啉和金纳米颗粒修饰的丝网印刷电极的新型电化学平台用于双酚A的灵敏检测
IF 2.7 3区 化学
Electroanalysis Pub Date : 2025-02-07 DOI: 10.1002/elan.12017
Fatma Rejab, Nour Elhouda Dardouri, Ahlem Rouis, Mosaab Echabaane, Habib Nasri, Hamdi Ben Halima, Nicole Jaffrezic-Renault
{"title":"A Novel Electrochemical Platform Based on Cadmium (II) (fluorophenyl)Porphyrin and Gold Nanoparticles Modified Screen-Printed Electrode Electrode for the Sensitive Detection of Bisphenol A","authors":"Fatma Rejab,&nbsp;Nour Elhouda Dardouri,&nbsp;Ahlem Rouis,&nbsp;Mosaab Echabaane,&nbsp;Habib Nasri,&nbsp;Hamdi Ben Halima,&nbsp;Nicole Jaffrezic-Renault","doi":"10.1002/elan.12017","DOIUrl":"https://doi.org/10.1002/elan.12017","url":null,"abstract":"<p>Bisphenol A (BPA) is categorized as an endocrine-disrupting substance; it is a risky substance to both environmental and human health, necessitating monitoring. In this present study, a novel electrochemical sensing platform based on Cd metalloporphyrin ([(5,10,15,20- tetrakis(p-flurophenyl) porphyrinato] cadmium (II) [CdTFPP]) and gold nanoparticles (AuNPs) for a rapid and sensitive determination of BPA was designed. To confirm the successful synthesis of CdTFPP, UV/vis, IR, and <sup>1</sup>H NMR were employed. The detection platform CdTFPP/AuNPs/SPCE was prepared using a screen-printed electrode (SPCE), through the deposition of AuNPs and CdTFPP by drop-casting. Under optimized measuring conditions, the developed sensor exhibited two linear ranges from 10<sup>−10</sup> to 10<sup>−7</sup> M and 10<sup>−7</sup> to 10<sup>−2</sup> M with a limit of detection of 133 pM. Additionally, the CdTFPP/AuNPs/SPCE/ electrode demonstrated to present an excellent selectivity and reproducibility and to be a promising tool for the development of simple low-cost water quality monitoring system for BPA detection.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 2","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design of a Peroxidase-Based Gas Diffusion Electrode for Bioelectroenzymatic Applications 生物电酶用过氧化物酶气体扩散电极的设计
IF 2.7 3区 化学
Electroanalysis Pub Date : 2025-02-04 DOI: 10.1002/elan.12015
Vladyslav Mishyn, Nunzio Giorgio G. Carducci, David P. Hickey, Sofiene Abdellaoui
{"title":"Design of a Peroxidase-Based Gas Diffusion Electrode for Bioelectroenzymatic Applications","authors":"Vladyslav Mishyn,&nbsp;Nunzio Giorgio G. Carducci,&nbsp;David P. Hickey,&nbsp;Sofiene Abdellaoui","doi":"10.1002/elan.12015","DOIUrl":"https://doi.org/10.1002/elan.12015","url":null,"abstract":"<p>We report here the design and application of an all-in-one gas diffusion electrode (GDE) combined with surface immobilized horseradish peroxidase (HRP) capable of <i>in situ</i> generation of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) from air and simultaneous oxidation of a model substrate (ABTS) within a single-cell electrochemical reactor. Carboxyl-functionalized multiwalled carbon nanotubes (MWCNT-COOH) were employed as an electrocatalyst for oxygen reduction reaction producing 719 ± 97 µM h<sup>−1</sup> H<sub>2</sub>O<sub>2</sub> at −0.2 V (<i>vs</i> Ag/AgCl) as an electron acceptor for HRP. We investigated two immobilization strategies to obtain HRP-modified biocathodes using covalent amide conjugation between primary amine groups of HRP and carboxyl groups of MWCNT-COOH (GDE/MWCNT-COOH/HRP) and entrapment into a cross-linked pyrene-modified linear poly(ethylenimine) matrix (GDE/MWCNT-COOH/Py-LPEI/HRP). Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) were used to characterize such surface modifications. The apparent catalytic activity achieved by HRP-modified biocathodes <i>via</i> either covalent conjugation or entrapment into a polymer film was 311 ± 31 U mg<sup>−1</sup> and 174 ± 17 U mg<sup>−1</sup>, respectively, as compared to the activity of freely diffusing 188 ± 23 U mg<sup>−1</sup>. The interfaces were reused showing 55% and 82% residual activity after 5 consecutive cycles for GDE/MWCNT-COOH/HRP and GDE/MWCNT-COOH/Py-LPEI/HRP, respectively. Our findings illustrate prospects for integrating GDE and surface-bound peroxidases for H<sub>2</sub>O<sub>2</sub>-dependent electroenzymatic reactions, offering a promising platform for diverse applications in bioelectrosynthesis.</p>","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 2","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143111886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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