CuO nanostructures grown on flexible Cu foil by a simple chemical bath deposition in a solution of aqueous ammonia have been explored for non-invasive and non-enzymatic detection of salivary glucose. The nanostructured electrode developed with 100 µL of aqueous ammonia achieves a high sensitivity of 3243 µA mM-1 cm-2, linear range up to 3 mM, and limit of detection of 0.77 µM. The electrode also demonstrates good anti-interference properties, high reproducibility, repeatability, and long-term stability up to 30 days. In addition, the electrode exhibits remarkable sensitivity of 2865 µA mM-1 cm-2 for salivary glucose detection. To explore its potential for non-invasive detection of actual salivary glucose, pre-prandial and post-prandial salivary glucose of different human volunteers were measured using the electrode and were found to be correlated with corresponding blood glucose levels. Development and investigation of similar sensors for non-invasive detection via untraditional methods would certainly pave the way towards next generation glucose monitoring devices and systems.
{"title":"Nano-Structured CuO Grown with Aqueous NH3 for Salivary Glucose Detection","authors":"Deepak Bharti, Atul Kumar Sharma, Trapti Mudgal, Manas Tiwari","doi":"10.1149/1945-7111/ad541d","DOIUrl":"https://doi.org/10.1149/1945-7111/ad541d","url":null,"abstract":"\u0000 CuO nanostructures grown on flexible Cu foil by a simple chemical bath deposition in a solution of aqueous ammonia have been explored for non-invasive and non-enzymatic detection of salivary glucose. The nanostructured electrode developed with 100 µL of aqueous ammonia achieves a high sensitivity of 3243 µA mM-1 cm-2, linear range up to 3 mM, and limit of detection of 0.77 µM. The electrode also demonstrates good anti-interference properties, high reproducibility, repeatability, and long-term stability up to 30 days. In addition, the electrode exhibits remarkable sensitivity of 2865 µA mM-1 cm-2 for salivary glucose detection. To explore its potential for non-invasive detection of actual salivary glucose, pre-prandial and post-prandial salivary glucose of different human volunteers were measured using the electrode and were found to be correlated with corresponding blood glucose levels. Development and investigation of similar sensors for non-invasive detection via untraditional methods would certainly pave the way towards next generation glucose monitoring devices and systems.","PeriodicalId":509718,"journal":{"name":"Journal of The Electrochemical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141267583","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 : 2024-06-04DOI: 10.1149/1945-7111/ad5419
chander shekhar Sekhar pundir, S. Pundir, Ajay Mehta, Vidhi Mehta
Breast cancer in women accounts for the second highest number of deaths worldwide. Among the various methods available, bio-sensing/immunosensing methods are comparatively more simple, rapid, sensitive, and specific. These biosensors detect the human epidermal growth factor receptor-2 (HER2) secreted in the serum of breast cancer patients at early stage of cancer. This review describes three types of biosensors depending on type of detection techniques used: Electrochemical techniques, including amperometric, voltametric, and impediametric; Piezoelectric techniques; and Optical techniques, including surface plasmon resonanance and fluorescence. These biosensors worked in the antibody concentration range, 1fg/ml to 500 ng/ml or 2 cells /ml with LOD ranging from 1fg/ml to 0.2ng/ml under the optimal assay conditions of pH (7.4 -7.5), temperature (25°C), and response time (10-30 min). The biosensors measured HER2 antigen level in sera of cancer patients, which was significantly higher than those in apparently healthy persons. The biosensors showed good storage stability (40-60 days) and regeneration ability. The merits and demerits of each class of immune-sensors are discussed. These biosensors could be miniaturized to make them portable to use at the bedside of patients.
{"title":"Review—Advances in Biosensors for Detecting Human Epidermal Growth Receptor-2 Antigen in Serum for Breast Cancer","authors":"chander shekhar Sekhar pundir, S. Pundir, Ajay Mehta, Vidhi Mehta","doi":"10.1149/1945-7111/ad5419","DOIUrl":"https://doi.org/10.1149/1945-7111/ad5419","url":null,"abstract":"\u0000 Breast cancer in women accounts for the second highest number of deaths worldwide. Among the various methods available, bio-sensing/immunosensing methods are comparatively more simple, rapid, sensitive, and specific. These biosensors detect the human epidermal growth factor receptor-2 (HER2) secreted in the serum of breast cancer patients at early stage of cancer. This review describes three types of biosensors depending on type of detection techniques used: Electrochemical techniques, including amperometric, voltametric, and impediametric; Piezoelectric techniques; and Optical techniques, including surface plasmon resonanance and fluorescence. These biosensors worked in the antibody concentration range, 1fg/ml to 500 ng/ml or 2 cells /ml with LOD ranging from 1fg/ml to 0.2ng/ml under the optimal assay conditions of pH (7.4 -7.5), temperature (25°C), and response time (10-30 min). The biosensors measured HER2 antigen level in sera of cancer patients, which was significantly higher than those in apparently healthy persons. The biosensors showed good storage stability (40-60 days) and regeneration ability. The merits and demerits of each class of immune-sensors are discussed. These biosensors could be miniaturized to make them portable to use at the bedside of patients.","PeriodicalId":509718,"journal":{"name":"Journal of The Electrochemical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141266677","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 : 2024-06-03DOI: 10.1149/1945-7111/ad537f
Maroua Moslah, C. Dridi
An electrochemical sensor based on eco-friendly green synthesized silver nanoparticles decorated reduced graphene oxide (AgNPs-rGO) modified screen-printed carbon electrode (SPCE) for the simultaneous detection of serotonin (5-HT) and dopamine (DA) is reported for the first time. The experimental parameters affecting the sensor performance were optimized in terms of AgNPs-rGO coating amount, scan rate and electrolyte pH (6-8). Under optimal conditions, the AgNPs-rGO/SPCE was employed to individually determine both analytes using DPV technique. The sensor was also efficient in the simultaneous detection of these species and reported well-resolved oxidation peaks with a linear range of 10-100 μM and detection limits of 7 µM and 7.41 µM, respectively. The developed device showed good selectivity, reproducibility, and repeatability. Furthermore, it was successfully applied to the determination of both biomolecules in artificial urine samples with good recovery. The main advantages of the designed sensor are its simplicity, portability, and low cost.
{"title":"Development of An Eco-Friendly and Cost-Effective Electrochemical Sensor for the Simultaneous Detection of Dopamine and Serotonin","authors":"Maroua Moslah, C. Dridi","doi":"10.1149/1945-7111/ad537f","DOIUrl":"https://doi.org/10.1149/1945-7111/ad537f","url":null,"abstract":"\u0000 An electrochemical sensor based on eco-friendly green synthesized silver nanoparticles decorated reduced graphene oxide (AgNPs-rGO) modified screen-printed carbon electrode (SPCE) for the simultaneous detection of serotonin (5-HT) and dopamine (DA) is reported for the first time. The experimental parameters affecting the sensor performance were optimized in terms of AgNPs-rGO coating amount, scan rate and electrolyte pH (6-8). Under optimal conditions, the AgNPs-rGO/SPCE was employed to individually determine both analytes using DPV technique. The sensor was also efficient in the simultaneous detection of these species and reported well-resolved oxidation peaks with a linear range of 10-100 μM and detection limits of 7 µM and 7.41 µM, respectively. The developed device showed good selectivity, reproducibility, and repeatability. Furthermore, it was successfully applied to the determination of both biomolecules in artificial urine samples with good recovery. The main advantages of the designed sensor are its simplicity, portability, and low cost.","PeriodicalId":509718,"journal":{"name":"Journal of The Electrochemical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141271045","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 : 2024-06-03DOI: 10.1149/1945-7111/ad537e
Bianca-Maria Ţuchiu, Raluca‐Ioana Stefan‐van Staden, J. V. van Staden
Betamethasone and gentamicin combination is commonly used in various dermatological conditions. In addition to the topical dosage forms in which this combination can be found, it can also accidentally end up in surface water following removal by washing. For this reason, a disposable miniplatform was constructed by modifying a boron-doped diamond screen printed electrode with calix[4]arene-25,26,27,28-tetrol. Wide linear ranges and low limits of quantification (LOQ) were achieved for both analytes: 1.0 × 10−16 − 1.0 × 10−2 mol L‒1 and a LOQ of 1.0 × 10−16 mol L‒1 for betamethasone, and 1.0 × 10−17 − 1.0 × 10−2 mol L‒1 and a LOQ of 1.0 × 10−17 mol L‒1 for gentamicin. The platform was tested on real samples, obtaining recovery values close to 100% and relative standard deviation values below 0.03%. Additionally, a comparison is provided between the proposed approach and existing electrochemical sensors to emphasize the achieved results.
{"title":"Intelligent Miniplatform for On-Site Monitoring of Water Samples and Pharmaceutical Production of Ointments Based on Betamethasone and Gentamicin as Active Pharmaceutical Ingredients","authors":"Bianca-Maria Ţuchiu, Raluca‐Ioana Stefan‐van Staden, J. V. van Staden","doi":"10.1149/1945-7111/ad537e","DOIUrl":"https://doi.org/10.1149/1945-7111/ad537e","url":null,"abstract":"\u0000 Betamethasone and gentamicin combination is commonly used in various dermatological conditions. In addition to the topical dosage forms in which this combination can be found, it can also accidentally end up in surface water following removal by washing. For this reason, a disposable miniplatform was constructed by modifying a boron-doped diamond screen printed electrode with calix[4]arene-25,26,27,28-tetrol. Wide linear ranges and low limits of quantification (LOQ) were achieved for both analytes: 1.0 × 10−16 − 1.0 × 10−2 mol L‒1 and a LOQ of 1.0 × 10−16 mol L‒1 for betamethasone, and 1.0 × 10−17 − 1.0 × 10−2 mol L‒1 and a LOQ of 1.0 × 10−17 mol L‒1 for gentamicin. The platform was tested on real samples, obtaining recovery values close to 100% and relative standard deviation values below 0.03%. Additionally, a comparison is provided between the proposed approach and existing electrochemical sensors to emphasize the achieved results.","PeriodicalId":509718,"journal":{"name":"Journal of The Electrochemical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141270154","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 : 2024-06-03DOI: 10.1149/1945-7111/ad537c
R. N. Gaines, B. A. Kleimenhagen, James J. Griebler, Lauren C. Harris, A. Gewirth, Simon A. Rogers, Paul Kenis
Many studies have investigated the conversion of biomass derivatives to value-added products. However, the influence of different factors on the reaction outcomes of these often-complex systems is not well understood. Herein, a statistical design of experiments – specifically, response surface methodology – is applied to the glycerol electrooxidation reaction in a flow electrolyzer. Four operational variables (glycerol concentration, NaOH concentration, flow rate, and catalyst loading) were investigated for their effects on measurable responses of the electrochemical reaction: current density and Faradaic efficiency to a given product. Independent optimizations of current density and Faradaic efficiency, as well as simultaneous optimization of both, were investigated. Each optimization was evaluated using response surface coefficients to analyze sensitivity and simulated runs to visualize the parameter space. These evaluations revealed contradictions in operating conditions required to simultaneously maximize current density and Faradaic efficiency to C3 products glycerate and lactate, leading to low current densities and Faradaic efficiencies. However, simultaneously maximizing current density and Faradaic efficiency to C1 product formate led to high current densities and Faradaic efficiencies. These insights guide tuning GEOR production to maximize overall reactor performance. Furthermore, this study outlines a framework for experimental evaluation and optimization of other electrolysis chemistries.
{"title":"Optimizing the Flow Electrooxidation of Glycerol Using Statistical Design of Experiments","authors":"R. N. Gaines, B. A. Kleimenhagen, James J. Griebler, Lauren C. Harris, A. Gewirth, Simon A. Rogers, Paul Kenis","doi":"10.1149/1945-7111/ad537c","DOIUrl":"https://doi.org/10.1149/1945-7111/ad537c","url":null,"abstract":"\u0000 Many studies have investigated the conversion of biomass derivatives to value-added products. However, the influence of different factors on the reaction outcomes of these often-complex systems is not well understood. Herein, a statistical design of experiments – specifically, response surface methodology – is applied to the glycerol electrooxidation reaction in a flow electrolyzer. Four operational variables (glycerol concentration, NaOH concentration, flow rate, and catalyst loading) were investigated for their effects on measurable responses of the electrochemical reaction: current density and Faradaic efficiency to a given product. Independent optimizations of current density and Faradaic efficiency, as well as simultaneous optimization of both, were investigated. Each optimization was evaluated using response surface coefficients to analyze sensitivity and simulated runs to visualize the parameter space. These evaluations revealed contradictions in operating conditions required to simultaneously maximize current density and Faradaic efficiency to C3 products glycerate and lactate, leading to low current densities and Faradaic efficiencies. However, simultaneously maximizing current density and Faradaic efficiency to C1 product formate led to high current densities and Faradaic efficiencies. These insights guide tuning GEOR production to maximize overall reactor performance. Furthermore, this study outlines a framework for experimental evaluation and optimization of other electrolysis chemistries.","PeriodicalId":509718,"journal":{"name":"Journal of The Electrochemical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141270847","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 : 2024-06-03DOI: 10.1149/1945-7111/ad5380
Guang Li, Xiangmei Tang, Kuang Sheng, Can Fang, Yiduo Zeng, Zhaomin Lu, Yaping Wang, Hu Zhou, Qingfeng Yi
Carbon-based electrocatalysts derived from zeolitic imidazolate framework-8 (ZIF-8) have garnered significant attention, owing to their structural advantages, high surface area, and tunable active sites. Herein, we report the synthesis of heteroatom sulfur (S) modified ZIF-8 derived carbon nanocages (ZnS@N/S-C) for oxygen electrocatalysis through self-assembly and two-step pyrolysis. The resultant ZnS@N/S-C exhibits catalytic activity towards oxygen reduction reaction (ORR) with high half-wave potential (0.86 V) and stability (91.4%), separately, which is comparable to or superior to Pt/C. Furthermore, the application of ZnS@N/S-C as a cathode for Zn-air batteries (ZABs) demonstrates performance metrics such as an open-circuit voltage of 1.407 V, a power density of 114.4 mW cm-2, and a specific capacity of 764.6 mAh gZn-1, etc. surpassing Pt/C. The performance of ZnS@N/S-C can be attributed to the fact that the introduction of S significantly increases the specific surface area, pore volume, and defect extent of the catalyst, while optimizing the electronic structure and generating ZnS active nanocrystals. This work employs a simple sulfurization strategy to enhance the ORR activity of ZIF-8-derived Zn-based catalysts with fully filled 3d orbitals, providing guidance for the development of such materials.
{"title":"Heteroatom Sulfur-Modified ZIF-8 Derived Zn, N Co-Doped Carbon Nanocages as Highly Efficient ORR Catalysts for Zn-Air Batteries","authors":"Guang Li, Xiangmei Tang, Kuang Sheng, Can Fang, Yiduo Zeng, Zhaomin Lu, Yaping Wang, Hu Zhou, Qingfeng Yi","doi":"10.1149/1945-7111/ad5380","DOIUrl":"https://doi.org/10.1149/1945-7111/ad5380","url":null,"abstract":"\u0000 Carbon-based electrocatalysts derived from zeolitic imidazolate framework-8 (ZIF-8) have garnered significant attention, owing to their structural advantages, high surface area, and tunable active sites. Herein, we report the synthesis of heteroatom sulfur (S) modified ZIF-8 derived carbon nanocages (ZnS@N/S-C) for oxygen electrocatalysis through self-assembly and two-step pyrolysis. The resultant ZnS@N/S-C exhibits catalytic activity towards oxygen reduction reaction (ORR) with high half-wave potential (0.86 V) and stability (91.4%), separately, which is comparable to or superior to Pt/C. Furthermore, the application of ZnS@N/S-C as a cathode for Zn-air batteries (ZABs) demonstrates performance metrics such as an open-circuit voltage of 1.407 V, a power density of 114.4 mW cm-2, and a specific capacity of 764.6 mAh gZn-1, etc. surpassing Pt/C. The performance of ZnS@N/S-C can be attributed to the fact that the introduction of S significantly increases the specific surface area, pore volume, and defect extent of the catalyst, while optimizing the electronic structure and generating ZnS active nanocrystals. This work employs a simple sulfurization strategy to enhance the ORR activity of ZIF-8-derived Zn-based catalysts with fully filled 3d orbitals, providing guidance for the development of such materials.","PeriodicalId":509718,"journal":{"name":"Journal of The Electrochemical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141271317","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 : 2024-06-03DOI: 10.1149/1945-7111/ad5381
N. Modghan, M. Mirjalili, M. Moayed, Ghasem Barati Darband
Establishing proper intrinsic catalysts with nanostructured high active surfaces endows the paramount electrocatalytic activity. A Ni-Se@Cu-Ni/NF catalyst for hydrogen and oxygen evolution reactions (HER and OER) is prepared via an efficient two-step pulse current (PC) electrodeposition method. The initial 3D film of Cu-Ni is synthesized via the dynamic hydrogen bubble template (DHBT) method to attain further active surface area. Then, Ni-Se film is prepared by direct current (DC) and PC electrodeposition. Morphological, chemical, and electrocatalytic characteristics of the Ni-Se electrodeposited films are evaluated. X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy results show a NiSe/NiSe2 nanofilm on the 3D microporous nanostructured Cu-Ni substrate which reveals an efficient bifunctional electrocatalytic behavior with overpotentials of 74 and 272 mV in the current density of 10 mA cm-2, and Tafel slopes of 78 and 50 mV dec-1 for HER and OER, respectively. The two-electrode examination with NiSe/NiSe2@Cu-Ni/NF catalyst in overall water splitting indicates a required potential of 1.57 V in the current density of 10 mA cm-2.
{"title":"Tailoring the Active Sites of Nanosheet NiSe/NiSe2 Catalyst by Pulse Electrodeposition on the 3D Microporous Ni-Cu/NF Substrate for both Hydrogen and Oxygen Evolution Reactions","authors":"N. Modghan, M. Mirjalili, M. Moayed, Ghasem Barati Darband","doi":"10.1149/1945-7111/ad5381","DOIUrl":"https://doi.org/10.1149/1945-7111/ad5381","url":null,"abstract":"\u0000 Establishing proper intrinsic catalysts with nanostructured high active surfaces endows the paramount electrocatalytic activity. A Ni-Se@Cu-Ni/NF catalyst for hydrogen and oxygen evolution reactions (HER and OER) is prepared via an efficient two-step pulse current (PC) electrodeposition method. The initial 3D film of Cu-Ni is synthesized via the dynamic hydrogen bubble template (DHBT) method to attain further active surface area. Then, Ni-Se film is prepared by direct current (DC) and PC electrodeposition. Morphological, chemical, and electrocatalytic characteristics of the Ni-Se electrodeposited films are evaluated. X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy results show a NiSe/NiSe2 nanofilm on the 3D microporous nanostructured Cu-Ni substrate which reveals an efficient bifunctional electrocatalytic behavior with overpotentials of 74 and 272 mV in the current density of 10 mA cm-2, and Tafel slopes of 78 and 50 mV dec-1 for HER and OER, respectively. The two-electrode examination with NiSe/NiSe2@Cu-Ni/NF catalyst in overall water splitting indicates a required potential of 1.57 V in the current density of 10 mA cm-2.","PeriodicalId":509718,"journal":{"name":"Journal of The Electrochemical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141268788","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 : 2024-06-03DOI: 10.1149/1945-7111/ad537d
R. Sayed, Manal S. Elmasry, Asmaa M Taha, Wafaa S. Hassan, R. E. El Nashar
For the first time, a green ecofriendly approach is applied, to develop a molecularly imprinted polymer (MIP) electrochemical for the assay of the oral anti-viral molnupiravir (MLN) as confirmed on referring to: analytical eco-scale, green analytical procedure index (GAPI), Raynie and Driver, analytical greenness metric (AGREE), and national environmental index (NEMI). MIP was electropolymerized on a glassy carbon electrode (GCE) modified with gold nanoparticles (MIP/AuNPs/GCE) to create a selective and efficient electrochemical nanosensor. The detection limit was set at 0.00098 ng/mL (3×10-12M) and the linearity range of MLN was between 0.033 ng/mL and 164 ng/mL (1×10-10–5×10-7 M). The MIP sensor was employed for MLN determination in its pharmaceutical product , spiked human plasma, and urine samples with mean recovery % (99.82% ± 0.53), (99.88% ± 0.62), and (97.90% ± 0.70), respectively. The investigated sensor provided good reproducibility, repeatability, and durability. Acceptable selectivity regarding MLN when mixed with structurally comparable compounds was proved with mean recovery % ± mean RSD (97.10% ± 0.03). Additionally, when molnupiravir was exposed to oxidative, hydrolytic, and thermal stress conditions, good results in stability-indicating studies served as an indicator of sensor selectivity.The developed electrode is coupled with a portable potentiostat, making it a promising point-of-care diagnostic.
{"title":"Innovative Molecularly Imprinted Electrochemical Sensor for Selective Nanomolar Detection of the Anti-COVID-19 Medication Molnupiravir","authors":"R. Sayed, Manal S. Elmasry, Asmaa M Taha, Wafaa S. Hassan, R. E. El Nashar","doi":"10.1149/1945-7111/ad537d","DOIUrl":"https://doi.org/10.1149/1945-7111/ad537d","url":null,"abstract":"\u0000 For the first time, a green ecofriendly approach is applied, to develop a molecularly imprinted polymer (MIP) electrochemical for the assay of the oral anti-viral molnupiravir (MLN) as confirmed on referring to: analytical eco-scale, green analytical procedure index (GAPI), Raynie and Driver, analytical greenness metric (AGREE), and national environmental index (NEMI). MIP was electropolymerized on a glassy carbon electrode (GCE) modified with gold nanoparticles (MIP/AuNPs/GCE) to create a selective and efficient electrochemical nanosensor. The detection limit was set at 0.00098 ng/mL (3×10-12M) and the linearity range of MLN was between 0.033 ng/mL and 164 ng/mL (1×10-10–5×10-7 M). The MIP sensor was employed for MLN determination in its pharmaceutical product , spiked human plasma, and urine samples with mean recovery % (99.82% ± 0.53), (99.88% ± 0.62), and (97.90% ± 0.70), respectively. The investigated sensor provided good reproducibility, repeatability, and durability. Acceptable selectivity regarding MLN when mixed with structurally comparable compounds was proved with mean recovery % ± mean RSD (97.10% ± 0.03). Additionally, when molnupiravir was exposed to oxidative, hydrolytic, and thermal stress conditions, good results in stability-indicating studies served as an indicator of sensor selectivity.The developed electrode is coupled with a portable potentiostat, making it a promising point-of-care diagnostic.","PeriodicalId":509718,"journal":{"name":"Journal of The Electrochemical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141270722","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 : 2024-05-17DOI: 10.1149/1945-7111/ad4d1f
Jingjing Liu, Liuyi Huang, J. Leveneur, Holger Fiedler, Samuel Jack Clarke, Thea Larsen, J. Kennedy, Mark Taylor
Water electrolysis has been used to produce green hydrogen, for which identifying optimum operation parameters is crucial to improve its energy efficiency and energy consumption. This paper used a commercial proton exchange membrane (PEM) water electrolyser stack (180 W) to demonstrate the correlation between operating current change, temperature, and water flow rate and their impact on the thermal and electrical performance of the stack. It was found that the current control regime and temperature control can offset the voltage ageing in a long-term operating electrolyser with no negative impact on the H2 production rate. For a controlled decreasing current path, in the medium range of operating current, the stack’s energy efficiency was improved by 5%, and 3.7% specific energy consumption can be saved comparing to the standard operation (57.8 kWh·kg-1H2). The results provide insights into the potential optimisation in operation conditions to further increase cell energy efficiency and reduce energy consumption. This new finding sheds light on developing an energy- and cost-saving operating method for long-term green hydrogen production via water electrolysis.
{"title":"Experimental Investigation of PEM Water Electrolyser Stack Performance Under Dynamic Operation Conditions","authors":"Jingjing Liu, Liuyi Huang, J. Leveneur, Holger Fiedler, Samuel Jack Clarke, Thea Larsen, J. Kennedy, Mark Taylor","doi":"10.1149/1945-7111/ad4d1f","DOIUrl":"https://doi.org/10.1149/1945-7111/ad4d1f","url":null,"abstract":"\u0000 Water electrolysis has been used to produce green hydrogen, for which identifying optimum operation parameters is crucial to improve its energy efficiency and energy consumption. This paper used a commercial proton exchange membrane (PEM) water electrolyser stack (180 W) to demonstrate the correlation between operating current change, temperature, and water flow rate and their impact on the thermal and electrical performance of the stack. It was found that the current control regime and temperature control can offset the voltage ageing in a long-term operating electrolyser with no negative impact on the H2 production rate. For a controlled decreasing current path, in the medium range of operating current, the stack’s energy efficiency was improved by 5%, and 3.7% specific energy consumption can be saved comparing to the standard operation (57.8 kWh·kg-1H2). The results provide insights into the potential optimisation in operation conditions to further increase cell energy efficiency and reduce energy consumption. This new finding sheds light on developing an energy- and cost-saving operating method for long-term green hydrogen production via water electrolysis.","PeriodicalId":509718,"journal":{"name":"Journal of The Electrochemical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140966215","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 : 2024-05-16DOI: 10.1149/1945-7111/ad4c57
Kokilavani R, Hiranmoy Kotal, Ajeet Kumar Kaushik, Saikat Kumar Jana
Immunosensors have emerged as vital tools in cancer diagnostics, providing simplified and rapid detection of biomarkers that are necessary for timely diagnosis. The objective of using an electrochemical immunosensor is to detect cancers at early stages, so that obtained biological information can be analyzed using artificial intelligence (AI) for deciding an appropriate treatment, avoiding false diagnosis, and preventing patient fatalities. The focus of this article is on four major reproductive cancers—breast, ovarian, cervical, and prostate cancers. Specifically, it explores the identification and optimization of biomarkers crucial for precise detection in these cancers. Examining a decade of research, the review delves into nanotechnology-assisted electrochemical immunosensors (affinity biosensors), outlining advancements and emphasizing their potential in reproductive cancer diagnostics. Furthermore, the review contemplates avenues for enhancing sensor characteristics to pave the way for their application in field diagnosis, with a forward-looking perspective on AI-assisted diagnostics for the next generation of personalized healthcare. In navigating the landscape of reproductive cancer diagnostics, the integration of advanced technologies promises to transform our approach, offering improved accuracy and outcomes for patients.
{"title":"Review—Nanotechnology-Assisted Electrochemical Immunosensors for Human Reproductive Cancer Diagnostics: Toward Laboratory to Clinics to Personalized Health Care","authors":"Kokilavani R, Hiranmoy Kotal, Ajeet Kumar Kaushik, Saikat Kumar Jana","doi":"10.1149/1945-7111/ad4c57","DOIUrl":"https://doi.org/10.1149/1945-7111/ad4c57","url":null,"abstract":"\u0000 Immunosensors have emerged as vital tools in cancer diagnostics, providing simplified and rapid detection of biomarkers that are necessary for timely diagnosis. The objective of using an electrochemical immunosensor is to detect cancers at early stages, so that obtained biological information can be analyzed using artificial intelligence (AI) for deciding an appropriate treatment, avoiding false diagnosis, and preventing patient fatalities. The focus of this article is on four major reproductive cancers—breast, ovarian, cervical, and prostate cancers. Specifically, it explores the identification and optimization of biomarkers crucial for precise detection in these cancers. Examining a decade of research, the review delves into nanotechnology-assisted electrochemical immunosensors (affinity biosensors), outlining advancements and emphasizing their potential in reproductive cancer diagnostics. Furthermore, the review contemplates avenues for enhancing sensor characteristics to pave the way for their application in field diagnosis, with a forward-looking perspective on AI-assisted diagnostics for the next generation of personalized healthcare. In navigating the landscape of reproductive cancer diagnostics, the integration of advanced technologies promises to transform our approach, offering improved accuracy and outcomes for patients.","PeriodicalId":509718,"journal":{"name":"Journal of The Electrochemical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140969942","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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