Electroanalysis最新文献_第10页

Dna Sensor Based on MoS2/MWCNT/AgNPs Nanocomposites for Sensitive Electrochemical Detection of Hydroxyl Radicals 基于MoS2/MWCNT/AgNPs纳米复合材料的Dna传感器用于羟基自由基的灵敏电化学检测

IF 2.3 3区化学

Electroanalysis Pub Date : 2025-07-20 DOI: 10.1002/elan.70021

Jiaxin Ye, Shiwei Chen, Siying Mao, Nicole Jaffrezic-Renault, Zhenzhong Guo

{"title":"Dna Sensor Based on MoS2/MWCNT/AgNPs Nanocomposites for Sensitive Electrochemical Detection of Hydroxyl Radicals","authors":"Jiaxin Ye, Shiwei Chen, Siying Mao, Nicole Jaffrezic-Renault, Zhenzhong Guo","doi":"10.1002/elan.70021","DOIUrl":"10.1002/elan.70021","url":null,"abstract":"Oxidative stress is intricately linked to the production of reactive oxygen species, which act as the primary catalysts for cellular structural damage, encompassing proteins, lipids, and DNA. Specifically, the hydroxyl radical (·OH) is one of the most chemically reactive free radicals and is considered a major driver of oxidative DNA damage. This type of damage can play a role in the progression of several neurodegenerative diseases, including Parkinson's and Alzheimer's, along with malignant tumors. Hence, precise measurement of ·OH levels in human tissues, organs, and blood is essential for the diagnosis of these conditions. In this research, we introduce an electrochemical DNA sensor constructed from MoS2/MWCNT/ silver nanoparticles (AgNPs) nanocomposites. The sensor employs 5′-sulfhydryl-modified single-stranded DNA (SH-DNA) anchored on AgNPs and enables sensitive detection of ·OH through oxidative damage to SH-DNA caused by ·OH generated through the Fenton reaction. The sensor's performance was thoroughly evaluated using a range of electrochemical techniques, including cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. The results demonstrate that the proposed sensor exhibits a low detection limit (46.88 μM) along with a wide linear range (50–5000 μM). Notably, it possesses high sensitivity and selectivity, showing great potential for early diagnosis and monitoring of oxidative stress-related diseases in the biomedical field.","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 7","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144666280","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

Dna Sensor Based on MoS2/MWCNT/AgNPs Nanocomposites for Sensitive Electrochemical Detection of Hydroxyl Radicals 基于MoS2/MWCNT/AgNPs纳米复合材料的Dna传感器用于羟基自由基的灵敏电化学检测

IF 2.7 3区化学

Electroanalysis Pub Date : 2025-07-20 DOI: 10.1002/elan.70021

Jiaxin Ye, Shiwei Chen, Siying Mao, Nicole Jaffrezic-Renault, Zhenzhong Guo

{"title":"Dna Sensor Based on MoS2/MWCNT/AgNPs Nanocomposites for Sensitive Electrochemical Detection of Hydroxyl Radicals","authors":"Jiaxin Ye, Shiwei Chen, Siying Mao, Nicole Jaffrezic-Renault, Zhenzhong Guo","doi":"10.1002/elan.70021","DOIUrl":"https://doi.org/10.1002/elan.70021","url":null,"abstract":"Oxidative stress is intricately linked to the production of reactive oxygen species, which act as the primary catalysts for cellular structural damage, encompassing proteins, lipids, and DNA. Specifically, the hydroxyl radical (·OH) is one of the most chemically reactive free radicals and is considered a major driver of oxidative DNA damage. This type of damage can play a role in the progression of several neurodegenerative diseases, including Parkinson's and Alzheimer's, along with malignant tumors. Hence, precise measurement of ·OH levels in human tissues, organs, and blood is essential for the diagnosis of these conditions. In this research, we introduce an electrochemical DNA sensor constructed from MoS2/MWCNT/ silver nanoparticles (AgNPs) nanocomposites. The sensor employs 5′-sulfhydryl-modified single-stranded DNA (SH-DNA) anchored on AgNPs and enables sensitive detection of ·OH through oxidative damage to SH-DNA caused by ·OH generated through the Fenton reaction. The sensor's performance was thoroughly evaluated using a range of electrochemical techniques, including cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. The results demonstrate that the proposed sensor exhibits a low detection limit (46.88 μM) along with a wide linear range (50–5000 μM). Notably, it possesses high sensitivity and selectivity, showing great potential for early diagnosis and monitoring of oxidative stress-related diseases in the biomedical field.","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 7","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144666281","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

Sensitive and Selective Detection of Vitamin C in Complex Real-Sample Matrices (Blood and Fruits) using a Coomassie Brilliant Blue-Modified Electrode 用考马斯亮蓝修饰电极灵敏、选择性地检测复杂样品基质（血液和水果）中的维生素C

IF 2.3 3区化学

Electroanalysis Pub Date : 2025-07-15 DOI: 10.1002/elan.70015

Pinapeddavari Mayuri, Peddapalyam Meghana, Saravakota Dharani, Dodoala Sujatha, K. Yesudas Yashly, Annamalai Senthil Kumar

{"title":"Sensitive and Selective Detection of Vitamin C in Complex Real-Sample Matrices (Blood and Fruits) using a Coomassie Brilliant Blue-Modified Electrode","authors":"Pinapeddavari Mayuri, Peddapalyam Meghana, Saravakota Dharani, Dodoala Sujatha, K. Yesudas Yashly, Annamalai Senthil Kumar","doi":"10.1002/elan.70015","DOIUrl":"10.1002/elan.70015","url":null,"abstract":"Vitamin C (ascorbic acid, AA) is a vital biochemical ubiquitous in foods, fruits, vegetables, pharmaceuticals, and clinical systems. Beyond diseases associated with vitamin C deficiency, it has been linked to several clinical disorders, including diabetes, anemia, osteoporosis, and heart disease. As a result, the development of simple, sensitive, and selective analytical methods for AA detection in real samples remains a significant research priority. In this study, we introduce a novel Coomassie Brilliant Blue (CBB) dye-functionalized multiwalled carbon nanotube (MWCNT) chemically modified electrode, denoted as MWCNT@CBB, as an efficient molecular electrocatalyst for real-time AA detection. The fabricated GCE/MWCNT@CBB electrode exhibits a distinct redox peak signal at E° = 92.5 mV vs Ag/AgCl, with a surface excess value (ΓCBB) of 11.3 × 10−9 mol cm−2. Physicochemical characterization using scanning electron microscopy, Fourier transform infrared (FTIR) spectroscopy, and Raman spectroscopy revealed that CBB is immobilized on MWCNT via robust π–π interactions between the aromatic π-electrons of CBB and the sp2 carbon of the graphitic sites on MWCNT. The electroanalytical applications of the sensor electrode were investigated using cyclic voltammetry, amperometric i-t, and batch injection analysis (BIA), yielding an ultra-low detection limit of 33.5 nM (BIA method). To demonstrate practical utility, the electrode was applied to the sensitive detection of ascorbic acid concentrations in fruit and healthy blood serum samples using the standard addition approach. This resulted in straightforward AA detection with recovery values close to 100%, highlighting the potential of the developed electrode for real-world applications in analytical chemistry.","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 7","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635271","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

Sensitive and Selective Detection of Vitamin C in Complex Real-Sample Matrices (Blood and Fruits) using a Coomassie Brilliant Blue-Modified Electrode 用考马斯亮蓝修饰电极灵敏、选择性地检测复杂样品基质（血液和水果）中的维生素C

IF 2.3 3区化学

Electroanalysis Pub Date : 2025-07-15 DOI: 10.1002/elan.70015

Pinapeddavari Mayuri, Peddapalyam Meghana, Saravakota Dharani, Dodoala Sujatha, K. Yesudas Yashly, Annamalai Senthil Kumar

{"title":"Sensitive and Selective Detection of Vitamin C in Complex Real-Sample Matrices (Blood and Fruits) using a Coomassie Brilliant Blue-Modified Electrode","authors":"Pinapeddavari Mayuri, Peddapalyam Meghana, Saravakota Dharani, Dodoala Sujatha, K. Yesudas Yashly, Annamalai Senthil Kumar","doi":"10.1002/elan.70015","DOIUrl":"10.1002/elan.70015","url":null,"abstract":"Vitamin C (ascorbic acid, AA) is a vital biochemical ubiquitous in foods, fruits, vegetables, pharmaceuticals, and clinical systems. Beyond diseases associated with vitamin C deficiency, it has been linked to several clinical disorders, including diabetes, anemia, osteoporosis, and heart disease. As a result, the development of simple, sensitive, and selective analytical methods for AA detection in real samples remains a significant research priority. In this study, we introduce a novel Coomassie Brilliant Blue (CBB) dye-functionalized multiwalled carbon nanotube (MWCNT) chemically modified electrode, denoted as MWCNT@CBB, as an efficient molecular electrocatalyst for real-time AA detection. The fabricated GCE/MWCNT@CBB electrode exhibits a distinct redox peak signal at E° = 92.5 mV vs Ag/AgCl, with a surface excess value (ΓCBB) of 11.3 × 10−9 mol cm−2. Physicochemical characterization using scanning electron microscopy, Fourier transform infrared (FTIR) spectroscopy, and Raman spectroscopy revealed that CBB is immobilized on MWCNT via robust π–π interactions between the aromatic π-electrons of CBB and the sp2 carbon of the graphitic sites on MWCNT. The electroanalytical applications of the sensor electrode were investigated using cyclic voltammetry, amperometric i-t, and batch injection analysis (BIA), yielding an ultra-low detection limit of 33.5 nM (BIA method). To demonstrate practical utility, the electrode was applied to the sensitive detection of ascorbic acid concentrations in fruit and healthy blood serum samples using the standard addition approach. This resulted in straightforward AA detection with recovery values close to 100%, highlighting the potential of the developed electrode for real-world applications in analytical chemistry.","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 7","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635087","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

Detection of Cisplatin with Boron-Doped Diamond Thin-Film Electrodes Using Flow Injection Analysis and Ion Exclusion Chromatography with Amperometric Detection 掺硼金刚石薄膜电极流动注射分析和离子排斥色谱-安培检测检测顺铂

IF 2.3 3区化学

Electroanalysis Pub Date : 2025-07-15 DOI: 10.1002/elan.70007

Aaron I. Jacobs, Alice W. Njue, Greg M. Swain

{"title":"Detection of Cisplatin with Boron-Doped Diamond Thin-Film Electrodes Using Flow Injection Analysis and Ion Exclusion Chromatography with Amperometric Detection","authors":"Aaron I. Jacobs, Alice W. Njue, Greg M. Swain","doi":"10.1002/elan.70007","DOIUrl":"10.1002/elan.70007","url":null,"abstract":"In this work, we investigated the electrochemical behavior of cisplatin at boron-doped diamond (BDD) thin-film electrodes using cyclic voltammetry. Flow injection analysis with amperometric detection (FIA-EC) was used to determine the detection figures of merit. No electrode surface modification or conventional pretreatment was required to activate the BDD electrodes. Diffusion-limited oxidation of cisplatin, dissolved in 0.1 M HClO4, occurred at 1.3 V (vs. Ag/AgCl (3M KCl)) in cyclic voltammetric measurements and at 1.5 V in hydrodynamic voltammetric measurements. FIA-EC peak current responses were reproducible over 10 consecutive injections of 100 μM cisplatin (relative standard deviation (RSD) = 2.7%) at 1.5 V. The FIA-EC peak current increased linearly with the cisplatin concentration from 1 to 100 μM (r2 = 0.988). The minimum detectable concentration was experimentally determined to be 0.5 μM (S/N = 3). Detection of cisplatin in spiked human urine was also investigated using FIA-EC. Other electrochemically active species present in the urine specimen interfered with cisplatin detection at 1.5 V. These interferents were separated from cisplatin in the spiked urine specimen using solid-phase extraction (SPE) sample pretreatment and ion exclusion chromatography. Both ultraviolet/visible (UV/Vis) and amperometric detection were compared. Cisplatin was detected 8.9 min after injection using a UV/Vis photodiode array (PDA) and 9.3 min after injection using BDD in an amperometric detector placed in series. Overall, BDD electrodes are a good choice for the reproducible and sensitive electrochemical detection of cisplatin using FIA-EC or ion exclusion chromatography prior to amperometric detection. Ion exclusion chromatography (IEC) adds selectivity for the electrochemical detection of cisplatin in urine specimens.","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 7","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/elan.70007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635069","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

Detection of Cisplatin with Boron-Doped Diamond Thin-Film Electrodes Using Flow Injection Analysis and Ion Exclusion Chromatography with Amperometric Detection 掺硼金刚石薄膜电极流动注射分析和离子排斥色谱-安培检测检测顺铂

IF 2.3 3区化学

Electroanalysis Pub Date : 2025-07-15 DOI: 10.1002/elan.70007

Aaron I. Jacobs, Alice W. Njue, Greg M. Swain

{"title":"Detection of Cisplatin with Boron-Doped Diamond Thin-Film Electrodes Using Flow Injection Analysis and Ion Exclusion Chromatography with Amperometric Detection","authors":"Aaron I. Jacobs, Alice W. Njue, Greg M. Swain","doi":"10.1002/elan.70007","DOIUrl":"10.1002/elan.70007","url":null,"abstract":"In this work, we investigated the electrochemical behavior of cisplatin at boron-doped diamond (BDD) thin-film electrodes using cyclic voltammetry. Flow injection analysis with amperometric detection (FIA-EC) was used to determine the detection figures of merit. No electrode surface modification or conventional pretreatment was required to activate the BDD electrodes. Diffusion-limited oxidation of cisplatin, dissolved in 0.1 M HClO4, occurred at 1.3 V (vs. Ag/AgCl (3M KCl)) in cyclic voltammetric measurements and at 1.5 V in hydrodynamic voltammetric measurements. FIA-EC peak current responses were reproducible over 10 consecutive injections of 100 μM cisplatin (relative standard deviation (RSD) = 2.7%) at 1.5 V. The FIA-EC peak current increased linearly with the cisplatin concentration from 1 to 100 μM (r2 = 0.988). The minimum detectable concentration was experimentally determined to be 0.5 μM (S/N = 3). Detection of cisplatin in spiked human urine was also investigated using FIA-EC. Other electrochemically active species present in the urine specimen interfered with cisplatin detection at 1.5 V. These interferents were separated from cisplatin in the spiked urine specimen using solid-phase extraction (SPE) sample pretreatment and ion exclusion chromatography. Both ultraviolet/visible (UV/Vis) and amperometric detection were compared. Cisplatin was detected 8.9 min after injection using a UV/Vis photodiode array (PDA) and 9.3 min after injection using BDD in an amperometric detector placed in series. Overall, BDD electrodes are a good choice for the reproducible and sensitive electrochemical detection of cisplatin using FIA-EC or ion exclusion chromatography prior to amperometric detection. Ion exclusion chromatography (IEC) adds selectivity for the electrochemical detection of cisplatin in urine specimens.","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 7","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/elan.70007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635273","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

Computational and Experimental Studies on Mixed-Phase Copper Species Deposited on Nitrogen-Doped Carbon Nanofibers for Electrochemical Sensing of Norfloxacin 氮掺杂碳纳米纤维混合相铜沉积电化学传感诺氟沙星的计算与实验研究

IF 2.3 3区化学

Electroanalysis Pub Date : 2025-07-15 DOI: 10.1002/elan.70001

Sahil, Asmita Mondal, Nivedita Acharjee, Dilbag Singh, Neeraj Gupta

{"title":"Computational and Experimental Studies on Mixed-Phase Copper Species Deposited on Nitrogen-Doped Carbon Nanofibers for Electrochemical Sensing of Norfloxacin","authors":"Sahil, Asmita Mondal, Nivedita Acharjee, Dilbag Singh, Neeraj Gupta","doi":"10.1002/elan.70001","DOIUrl":"10.1002/elan.70001","url":null,"abstract":"This work reports the synthesis of mixed-phase copper species deposited on nitrogen-doped carbon nanofibers (Cu@N-CNF) involving thermal annealing of the CNF followed by solvothermal treatment for the deposition of copper species. The developed sensor was applied for the electrochemical sensing of antibiotic norfloxacin (NOR). The Cu@N-CNF was characterized using X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), high-resolution transmission electron microscopy, and Raman spectroscopy. Hybrid morphology of Cu@N-CNF was revealed showing oval patches deposited over fibrous structure with intermittent dark spots. XRD revealed that copper is present in its various forms such as CuO, Cu(OH)2, along with the g-C3N4 sheets. Furthermore, XPS analysis provided the atomic percentages of C 1s, N 1s, Cu 2p, and O 1s, while FTIR analysis identified the presence of various functional groups. The antibiotic NOR was detected with cyclic voltammetry and differential normal pulse voltammetry techniques. A linear relationship was obtained between current (μA) response and concentration of NOR varying from 0.6 to 11.7 µM with a limit of detection (LOD) of 400 nM. The limit of quantification obtained is 1.4 μM with improved sensitivity of 4.53 µA/µM·cm2. The developed sensor was also tested on human urine samples with a 1.97 μM LOD. It was further observed that the oxidation of NOR followed a diffusion-controlled mechanism. The physicochemical properties and interaction dynamics between the analyte and material were thoroughly investigated using a combination of electrochemical analysis and density-functional theory calculations. The deposition of mixed-phase Cu species on N-CNF decreases the highest occupied molecular orbital-lowest unoccupied molecular orbital gap in Cu@N-CNF that indicates the stability of the material.","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 7","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635088","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

Computational and Experimental Studies on Mixed-Phase Copper Species Deposited on Nitrogen-Doped Carbon Nanofibers for Electrochemical Sensing of Norfloxacin 氮掺杂碳纳米纤维混合相铜沉积电化学传感诺氟沙星的计算与实验研究

IF 2.3 3区化学

Electroanalysis Pub Date : 2025-07-15 DOI: 10.1002/elan.70001

Sahil, Asmita Mondal, Nivedita Acharjee, Dilbag Singh, Neeraj Gupta

{"title":"Computational and Experimental Studies on Mixed-Phase Copper Species Deposited on Nitrogen-Doped Carbon Nanofibers for Electrochemical Sensing of Norfloxacin","authors":"Sahil, Asmita Mondal, Nivedita Acharjee, Dilbag Singh, Neeraj Gupta","doi":"10.1002/elan.70001","DOIUrl":"10.1002/elan.70001","url":null,"abstract":"This work reports the synthesis of mixed-phase copper species deposited on nitrogen-doped carbon nanofibers (Cu@N-CNF) involving thermal annealing of the CNF followed by solvothermal treatment for the deposition of copper species. The developed sensor was applied for the electrochemical sensing of antibiotic norfloxacin (NOR). The Cu@N-CNF was characterized using X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), high-resolution transmission electron microscopy, and Raman spectroscopy. Hybrid morphology of Cu@N-CNF was revealed showing oval patches deposited over fibrous structure with intermittent dark spots. XRD revealed that copper is present in its various forms such as CuO, Cu(OH)2, along with the g-C3N4 sheets. Furthermore, XPS analysis provided the atomic percentages of C 1s, N 1s, Cu 2p, and O 1s, while FTIR analysis identified the presence of various functional groups. The antibiotic NOR was detected with cyclic voltammetry and differential normal pulse voltammetry techniques. A linear relationship was obtained between current (μA) response and concentration of NOR varying from 0.6 to 11.7 µM with a limit of detection (LOD) of 400 nM. The limit of quantification obtained is 1.4 μM with improved sensitivity of 4.53 µA/µM·cm2. The developed sensor was also tested on human urine samples with a 1.97 μM LOD. It was further observed that the oxidation of NOR followed a diffusion-controlled mechanism. The physicochemical properties and interaction dynamics between the analyte and material were thoroughly investigated using a combination of electrochemical analysis and density-functional theory calculations. The deposition of mixed-phase Cu species on N-CNF decreases the highest occupied molecular orbital-lowest unoccupied molecular orbital gap in Cu@N-CNF that indicates the stability of the material.","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 7","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635272","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

Online Response Performance and Optimization of Sediment Microbial Fuel Cell-Based Sensors to pH 沉积物微生物燃料电池传感器对pH值的在线响应性能及优化

IF 2.7 3区化学

Electroanalysis Pub Date : 2025-07-09 DOI: 10.1002/elan.70010

Chenlu Li, Tao Li, Fengquan Li, Yaqing Xu, Ying Li, Ran Liu, Zhenyi Chen, Cheng Han, Yunbin Jiang, Huan Deng

{"title":"Online Response Performance and Optimization of Sediment Microbial Fuel Cell-Based Sensors to pH","authors":"Chenlu Li, Tao Li, Fengquan Li, Yaqing Xu, Ying Li, Ran Liu, Zhenyi Chen, Cheng Han, Yunbin Jiang, Huan Deng","doi":"10.1002/elan.70010","DOIUrl":"https://doi.org/10.1002/elan.70010","url":null,"abstract":"Sediment microbial fuel cells (SMFCs) offer a promising approach for in situ and online pH monitoring, and enhancing their sensitivity is critical for promoting practical application. In this study, the sensors with different anode areas (4, 18, and 81 cm2) and external resistance (50, 1 k, 20 kΩ, and open-circuit) were constructed in flooded soil. Buffer solutions with pH values ranging from 2.2 to 11.8 were added to the surface of the cathode to simulate acidic and alkaline contaminations. Results showed that the addition of acidic buffer solutions triggered voltage peaks whereas alkaline solutions caused voltage drops. The highest sensitivity was observed with a 20 kΩ resistor and a larger anode area than 4 cm2. The two-way ANOVA confirmed that the factors of the anode area and external resistance were significant (p < 0.001) for the sensitivity. The repeated contaminations did not alter pH value of soil where the anode was buried, and electrogenic bacteria were enriched on the anode after the operation of the SMFC sensors. As external resistance increases, the relative abundance of exoelectrogenic bacteria-associated genera (EB-genera) to total bacteria progressively decreased. Clostridium, Thermincola, Anaeromyxobacter, Acinetobacter, and Desulfitobacterium were the most abundant EB-genera on the anode.","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 7","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589691","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 Simultaneous Electrochemical Sensor of Triple Heavy Metal Ions Based on Synergistic Catalysis of Copper and Platinum Nanoparticles@Graphene Composites 基于铜铂复合材料协同催化的三重重金属离子同步电化学传感器Nanoparticles@Graphene

IF 2.7 3区化学

Electroanalysis Pub Date : 2025-07-09 DOI: 10.1002/elan.70012

Zhiguang Liu, Hongyuan Chen, Yujing Guo

{"title":"A Simultaneous Electrochemical Sensor of Triple Heavy Metal Ions Based on Synergistic Catalysis of Copper and Platinum Nanoparticles@Graphene Composites","authors":"Zhiguang Liu, Hongyuan Chen, Yujing Guo","doi":"10.1002/elan.70012","DOIUrl":"https://doi.org/10.1002/elan.70012","url":null,"abstract":"Heavy metal ions emitted from industrial production continue to accumulate in the environment, posing a major risk to human health. Thus, the development of multiple heavy metal ion simultaneous detection methods will greatly contribute to the prevention and control of heavy metal pollution. Due to the unique electronic structure of bimetallic nanoalloys especially composed of transition metals and precious metals, they regularly have high catalytic activity. Herein, we found that bimetallic nanoparticles composed of copper (Cu) and platinum (Pt) have higher catalytic activity than those composed of Cu and cobalt (Co), nickel (Ni), gold (Au), and palladium (Pd). Accordingly, CuPt bimetallic nanoparticles@graphene (CuPtNPs@rGO) composites have been synthesized by simple one-pot method, and an electrochemical sensor for simultaneous detection of Cd2+, Pb2+, and Hg2+ based on CuPtNPs@rGO has been successfully developed. Differential pulsed anodic stripping voltammetry was used for heavy metal ions sensing. The sensor has wide linear ranges for simultaneous detection of Cd2+, Pb2+, and Hg2+, which are 0.06 ∼ 5.0, 0.01 ∼ 5.0, and 0.06 ∼ 5.0 μM, respectively, and quite low detection limits of 20.0, 3.30, and 20.0 nM, respectively. Furthermore, the proposed method presents outstanding repeatability, stability, and good recovery in real sample tests, emerging a promising prospect for the practical detection of environmental water samples.","PeriodicalId":162,"journal":{"name":"Electroanalysis","volume":"37 7","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589690","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