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Singh D, Verma R, Singh KR, Srivastava M, Singh RP, Singh J. Biogenic synthesis of CuO/ZnO nanocomposite from Bauhinia variegate flower extract for highly sensitive electrochemical detection of vitamin B 2. BIOMATERIALS ADVANCES 2024; 161:213898. [PMID: 38796957 DOI: 10.1016/j.bioadv.2024.213898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 02/29/2024] [Accepted: 05/15/2024] [Indexed: 05/29/2024]
Abstract
In this study, we report the preparation of bio-inspired binary CuO/ZnO nanocomposite (bb-CuO/ZnO nanocomposite) via the biological route using Bauhinia variegata flower extract following hydrothermal treatment. The prepared bb-CuO/ZnO nanocomposite was electrophoretically deposited (EPD) on indium tin oxide (ITO) substrate to develop bb-CuO/ZnO/ITO biosensing electrode which is employed for the determination of vitamin B2 (Riboflavin) through electrochemical techniques. Physicochemical assets of the prepared bb-CuO/ZnO nanocomposite have been extensively evaluated and make use of different characterization techniques including powder XRD, FT-IR, AFM, SEM, TEM, EDX, XPS, Raman, and TGA. Electrochemical characteristics of the bb-CuO/ZnO/ITO biosensing electrode have been studied towards vitamin B2 determination. Furthermore, different biosensing parameters such as response time, reusability, stability, interference, and real sample analysis were also estimated. From the linear plot of scan rate, charge transfer rate constant (Ks), surface concentration of electrode (γ), and diffusion coefficient (D) have been calculated, and these are found to be 6.56 × 10-1 s-1, 1.21 × 10-7 mol cm-2, and 6.99 × 10-3 cm2 s-1, respectively. This biosensor exhibits the linear range of vitamin B2 detection from 1 to 40 μM, including sensitivity and limit of detection (LOD) of 1.37 × 10-3 mA/μM cm2 and 0.254 μM, respectively. For higher concentration range detection linearity is 50-100 μM, with sensitivity and the LOD of 1.26 × 10-3 mA/μM cm2 and 0.145 μM, respectively. The results indicate that the bio-inspired nanomaterials are promising sustainable biosensing platforms for various food and health-based biosensing devices.
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Affiliation(s)
- Diksha Singh
- Department of Chemistry, Institute of Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India
| | - Rahul Verma
- Department of Chemistry, Institute of Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India
| | - Kshitij Rb Singh
- Department of Chemistry, Institute of Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India
| | - Manish Srivastava
- Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU) Varanasi, Uttar Pradesh 221005, India; Saveetha Institute of Medical and Technical Sciences, (Deemed to be University), Chennai, 600077, India
| | - Ravindra Pratap Singh
- Department of Biotechnology, Faculty of Science, Indira Gandhi National Tribal University, Amarkantak, Madhya Pradesh 484887, India
| | - Jay Singh
- Department of Chemistry, Institute of Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India.
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Haššo M, Kudr J, Zítka J, Šílený J, Švec P, Švorc Ľ, Zítka O. Proving the automatic benchtop electrochemical station for the development of dopamine and paracetamol sensors. Mikrochim Acta 2024; 191:408. [PMID: 38898321 PMCID: PMC11186920 DOI: 10.1007/s00604-024-06454-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Accepted: 05/20/2024] [Indexed: 06/21/2024]
Abstract
The introduced work represents an implementation of the automatic benchtop electrochemical station (BES) as an effective tool for the possibilities of high-throughput preparation of modified sensor/biosensors, speeding up the development of the analytical method, and automation of the analytical procedure for the determination of paracetamol (PAR) and dopamine (DOP) as target analytes. Within the preparation of gold nanoparticles modified screen-printed carbon electrode (AuNPs-SPCE) by electrodeposition, the deposition potential EDEP, the deposition time tDEP, and the concentration of HAuCl4 were optimized and their influence was monitored on 1 mM [Ru(NH3)6]3+/2+ redox probe and 50 μM DOP. The morphology of the AuNPs-SPCE prepared at various modification conditions was observed by SEM. The analytical performance of the AuNPs-SPCE prepared at different modification conditions was evaluated by a construction of the calibration curves of DOP and PAR. SPCE and AuNPs-SPCE at modification condition providing the best sensitivity to PAR and DOP, were successfully used to determine PAR and DOP in tap water by "spike-recovery" approach. The BES yields better reproducibility of the preparation of AuNPs-SPCE (RSD = 3.0%) in comparison with the case when AuNPs-SPCE was prepared manually by highly skilled laboratory operator (RSD = 7.0%).
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Affiliation(s)
- Marek Haššo
- Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, Bratislava, 812 37, Slovakia
| | - Jiří Kudr
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, Brno, 613 00, Czech Republic
| | - Jan Zítka
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, Brno, 613 00, Czech Republic
| | - Jan Šílený
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, Brno, 613 00, Czech Republic
| | - Pavel Švec
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, Brno, 613 00, Czech Republic
| | - Ľubomír Švorc
- Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, Bratislava, 812 37, Slovakia
| | - Ondřej Zítka
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, Brno, 613 00, Czech Republic.
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3
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Radoniqi S, Spahiu Q, Mehmeti E, Kalcher K, Dragusha S. Electrochemical determination of riboflavin in pharmaceuticals using unmodified screen printed carbon electrodes. ANAL SCI 2024; 40:681-689. [PMID: 38345743 DOI: 10.1007/s44211-024-00505-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 12/19/2023] [Indexed: 03/26/2024]
Abstract
In this study, we have devised an efficient and rapid approach to detect riboflavin (also known as Vitamin B2 or VB2) utilizing an unaltered screen-printed carbon electrode (SPCE). The unmodified screen-printed electrodes are created within the laboratory, where carbon ink is applied to a ceramic substrate. All experiments pertaining to the investigation of electrochemical behavior and the fine-tuning of crucial experimental parameters were conducted through cyclic voltammetry (CV). For quantitative assessments, square wave voltammetry (SWV) was employed. The findings indicate that unaltered SPCEs exhibit robust current signals during the riboflavin redox reaction. Riboflavin displays a distinct oxidation peak at - 0.136 V (vs. Ag/AgCl, 3.0 M KCl) in a Britton-Robinson buffer solution (BRBS) at pH 2, which was employed for quantification. The electrode demonstrates a broad linear range from 0.05 to 10 µM, boasting a detection limit of 0.03 µM. Repeatability stands at 1.45%, while reproducibility is 6.61%. Testing the influence of common interfering compounds yielded negligible results. The sensor effectively determines riboflavin content in pharmaceutical formulations without any prior treatment. This method presents an economical, modifier-free sensor with exceptional sensitivity and cost-effectiveness, making it suitable for rapid riboflavin quantification.
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Affiliation(s)
- Skender Radoniqi
- Faculty of Pharmacy, UBT-Higher Education Institution, Lagjja Kalabria P.N., 10000, Pristina, Republic of Kosovo
| | - Qëndresa Spahiu
- Faculty of Pharmacy, UBT-Higher Education Institution, Lagjja Kalabria P.N., 10000, Pristina, Republic of Kosovo
| | - Eda Mehmeti
- Faculty of Pharmacy, UBT-Higher Education Institution, Lagjja Kalabria P.N., 10000, Pristina, Republic of Kosovo
- Institute of Chemistry, Analytical Chemistry, Karl-Franzens University, Universitaetsplatz I/I, 8010, Graz, Austria
| | - Kurt Kalcher
- Institute of Chemistry, Analytical Chemistry, Karl-Franzens University, Universitaetsplatz I/I, 8010, Graz, Austria
| | - Shpend Dragusha
- Faculty of Pharmacy, UBT-Higher Education Institution, Lagjja Kalabria P.N., 10000, Pristina, Republic of Kosovo.
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Nocito G, Zribi R, Chelly M, Pulvirenti L, Nicotra G, Bongiorno C, Arrigo A, Fazio B, Neri G, Nastasi F, Conoci S. Photochemical synthesis, characterization, and electrochemical sensing properties of CD-AuNP nanohybrids. NANOSCALE 2024; 16:3571-3582. [PMID: 38293870 DOI: 10.1039/d3nr05897b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
Among the existing nanosystems used in electrochemical sensing, gold nanoparticles (AuNPs) have attracted considerable attention owing to their intriguing chemical and physical properties such as good electrical conductivity, high electrocatalytic activity, and high surface-to-volume ratio. However, despite these useful characteristics, there are some issues due to their instability in solution that can give rise to aggregation phenomena and the use of hazardous chemicals in the most common synthetic procedures. With an aim to find a solution to these issues, recently, we prepared and characterized carbon dots (CDs), from olive solid wastes, and employed them as reducing and capping agents in photo-activated AuNP synthesis, thus creating CD-Au nanohybrids. These nanomaterials appear extremely stable in aqueous solutions at room temperature, are contemporary, and have been obtained using CDs, which are exclusively based on non-toxic elements, with an additional advantage of being generated from an otherwise waste material. In this paper, the synthesis and characterization of CD-Au nanohybrids are described, and the electrochemical experiments for hydroquinone detection are discussed. The results indicate that CD-Au acts as an efficient material for sensing hydroquinone, matching a wide range of interests in science from industrial processes to environmental pollution.
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Affiliation(s)
- Giuseppe Nocito
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres, 31, 98166 Messina, Italy.
| | - Rayhane Zribi
- Department of Engineering, University of Messina, Contrada Di Dio, 98166 Messina, Italy
| | - Meryam Chelly
- Department of Engineering, University of Messina, Contrada Di Dio, 98166 Messina, Italy
| | - Luca Pulvirenti
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria, 6, 95125 Catania, Italy
| | - Giuseppe Nicotra
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi (CNR-IMM), Strada VIII, n. 5, Zona Industriale, Catania, 1-95121 Italy
| | - Corrado Bongiorno
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi (CNR-IMM), Strada VIII, n. 5, Zona Industriale, Catania, 1-95121 Italy
| | - Antonino Arrigo
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres, 31, 98166 Messina, Italy.
- Interuniversitary Research Center for Artificial Photosynthesis (Solar Chem, Messina Node), Viale Ferdinando Stagno d'Alcontres, 31, 98166 Messina, Italy
| | - Barbara Fazio
- Consiglio Nazionale delle Ricerche, URT Lab-Sens Beyond Nano - Department of Physical Science and Technologies of Matter, Viale Ferdinando Stagno d'Alcontres, 31, 98166 Messina, Italy
- Consiglio Nazionale delle Ricerche, Istituto per i Processi Chimico Fisici (CNR-IPCF), Viale Ferdinando Stagno d'Alcontres, 37, 98158 Messina, Italy
| | - Giovanni Neri
- Department of Engineering, University of Messina, Contrada Di Dio, 98166 Messina, Italy
| | - Francesco Nastasi
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres, 31, 98166 Messina, Italy.
- Interuniversitary Research Center for Artificial Photosynthesis (Solar Chem, Messina Node), Viale Ferdinando Stagno d'Alcontres, 31, 98166 Messina, Italy
- Consiglio Nazionale delle Ricerche, URT Lab-Sens Beyond Nano - Department of Physical Science and Technologies of Matter, Viale Ferdinando Stagno d'Alcontres, 31, 98166 Messina, Italy
| | - Sabrina Conoci
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres, 31, 98166 Messina, Italy.
- Consiglio Nazionale delle Ricerche, URT Lab-Sens Beyond Nano - Department of Physical Science and Technologies of Matter, Viale Ferdinando Stagno d'Alcontres, 31, 98166 Messina, Italy
- Department of Chemistry "Giacomo Ciamician", University of Bologna, Via Selmi, 2, 40126 Bologna, Italy
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Muthukumaran MK, Govindaraj M, Raja BK, J AS. In situ synthesis of polythiophene encapsulated 2D hexagonal boron nitride nanocomposite based electrochemical transducer for detection of 5-fluorouracil with high selectivity. RSC Adv 2023; 13:2780-2794. [PMID: 36756436 PMCID: PMC9850362 DOI: 10.1039/d2ra07147a] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 01/05/2023] [Indexed: 01/20/2023] Open
Abstract
It is difficult for the scientific community to develop a nonenzymatic sensing platform for extremely sensitive and selective detection of specific biomolecules, antibiotics, food adulterants, heavy metals, etc. One of the most significant chemotherapy drugs, 5-fluorouracil (5-Fu), which is used to treat solid malignancies, has a fluorine atom in the fifth position of the uracil molecule. Recognizing the secure and effective dosing of drugs for chemotherapy continues to be a critical concern in cancer disease management. The maintenance of the optimal 5-Fu concentration is dependent on the presence of 5-Fu in biofluids. Herein we reported a conducting polymer encapsulated 2D material, PTh/h-BN for the efficient electrochemical detection of anticancer drug 5-Fu. Furthermore, the synthesized PTh/h-BN nanocomposite was confirmed by the High-Resolution Transmission Electron Microscope (HR-TEM), High-Resolution Scanning Electron Microscope (HR-SEM), X-ray diffraction (XRD), and Fourier-Transform Infrared Spectroscopy (FT-IR). The electrical resistance of PTh/h-BN modified GCE and its sensing performance towards 5-Fu were tested using Electrochemical Impedance Spectroscopy (EIS) and Cyclic Voltammetry (CV) studies respectively. The analytical performance of our proposed catalyst was tested using Differential Pulse Voltammetry (DPV), and the amperometry (i-t curve) method. From the results, our proposed PTh/h-BN nanocomposite-modified GCE shows enhanced sensing performance due to higher redox peak currents, large active surface area, and high electrical conductivity. Moreover, the nanohybrid shows enhanced sensing performances with quick response time, wide linear range, the lowest limit of detection, high sensitivity, and high selectivity in the presence of various interferents. Finally, the practical applicability of the proposed sensor was tested with real-world samples with very good recovery percentages.
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Affiliation(s)
- Magesh Kumar Muthukumaran
- Department of Chemistry, SRM Institute of Science and Technology Kattankulathur 603203 Tamil Nadu India
| | - Muthukumar Govindaraj
- Department of Chemistry, SRM Institute of Science and Technology Kattankulathur 603203 Tamil Nadu India
| | - Bharathi Kannan Raja
- Department of Chemistry, SRM Institute of Science and Technology Kattankulathur 603203 Tamil Nadu India
| | - Arockia Selvi J
- Department of Chemistry, SRM Institute of Science and Technology Kattankulathur 603203 Tamil Nadu India
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Sedhu N, Jagadeesh Kumar J, Sivaguru P, Raj V. Electrochemical detection of riboflavin in pharmaceutical and food samples using in situ electropolymerized glycine coated pencil graphite electrode. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.117037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Rizalputri LN, Anshori I, Handayani M, Gumilar G, Septiani NLW, Hartati YW, Annas MS, Purwidyantri A, Prabowo BA, Yuliarto B. Facile and controllable synthesis of monodisperse gold nanoparticle bipyramid for electrochemical dopamine sensor. NANOTECHNOLOGY 2022; 34:055502. [PMID: 36301678 DOI: 10.1088/1361-6528/ac9d3f] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
We demonstrated potential features of gold nanoparticle bipyramid (AuNB) for an electrochemical biosensor. The facile synthesis method and controllable shape and size of the AuNB are achieved through the optimization of cetyltrimethylammonium chloride (CTAC) surfactant over citric acid (CA) ratio determining the control of typically spherical Au seed size and its transition into a penta-twinned crystal structure. We observe that the optimized ratio of CTAC and CA facilitates flocculation control in which Au seeds with size as tiny as ∼14.8 nm could be attained and finally transformed into AuNB structures with an average length of ∼55 nm with high reproducibility. To improve the electrochemical sensing performance of a screen-printed carbon electrode, surface modification with AuNB via distinctive linking procedures effectively enhanced the electroactive surface area by 40%. Carried out for the detection of dopamine, a neurotransmitter frequently linked to the risk of Parkinson's, Alzheimer's, and Huntington's diseases, the AuNB decorated-carbon electrode shows outstanding electrocatalytic activity that improves sensing performance, including high sensitivity, low detection limit, wide dynamic range, high selectivity against different analytes, such as ascorbic acid, uric acid and urea, and excellent reproducibility.
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Affiliation(s)
- Lavita Nuraviana Rizalputri
- Department of Nanotechnology, Graduate School, Bandung Institute of Technology, Bandung, Indonesia
- Research Center for Nanoscience and Nanotechnology (RCNN), Bandung Institute of Technology, Bandung, Indonesia
| | - Isa Anshori
- Research Center for Nanoscience and Nanotechnology (RCNN), Bandung Institute of Technology, Bandung, Indonesia
- Department of Biomedical Engineering, Bandung Institute of Technology, Bandung, Indonesia
| | - Murni Handayani
- Research Center for Advanced Materials, National Research and Innovation Agency (BRIN), Tangerang Selatan, Indonesia
| | - Gilang Gumilar
- Research Center for Nanoscience and Nanotechnology (RCNN), Bandung Institute of Technology, Bandung, Indonesia
- Advanced Functional Materials Laboratory, Engineering Physics Department, Bandung Institute of Technology, Bandung, Indonesia
| | - Ni Luh Wulan Septiani
- Research Center for Advanced Materials, National Research and Innovation Agency (BRIN), Tangerang Selatan, Indonesia
| | - Yeni Wahyuni Hartati
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, Indonesia
- Research Center of Molecular Biotechnology and Bioinformatics, Universitas Padjadjaran, Bandung, Indonesia
| | | | - Agnes Purwidyantri
- School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, United Kingdom
| | - Briliant Adhi Prabowo
- Research Center for Electronics, National Research and Innovation Agency (BRIN), Bandung, Indonesia
- International Iberian Nanotechnology Laboratory, Braga, Portugal
| | - Brian Yuliarto
- Research Center for Nanoscience and Nanotechnology (RCNN), Bandung Institute of Technology, Bandung, Indonesia
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Mendes Hacke AC, Lima D, Kuss S. Green synthesis of electroactive nanomaterials by using plant-derived natural products. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116786] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Jin X, Zhao Y, Gu X, Zhong M, Kong X, Li G, Tian G, Liu J. Quantification of Myoinositol in Serum by Electrochemical Detection with an Unmodified Screen-Printed Carbon Electrode. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2022; 2022:3998338. [PMID: 35392281 PMCID: PMC8983225 DOI: 10.1155/2022/3998338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 03/08/2022] [Accepted: 03/17/2022] [Indexed: 06/14/2023]
Abstract
Simple, rapid, and accurate detection of myoinositol (MI) concentration in blood is crucial in diagnosing polycystic ovary syndrome, neurological disorders, and cancer. A novel electrochemical detection (IED) method was established to quantify MI in human serum using a disposable unmodified screen-printed carbon electrode (SPCE) for the first time. MI was detected indirectly by the reaction product of myoinositol dehydrogenase (IDH) and cofactor β-nicotinamide adenine dinucleotide (NAD+). Good linear calibration curves were obtained at the concentration range from 5.0 μM to 500.0 μM (R 2 = 0.9981) with the lower limits of detection (LOD) and quantification (LOQ) of 1.0 μM and 2.5 μM, respectively. Recoveries were calculated at three spiked concentrations, and the values were between 90.3 and 106%, with relative standard deviation values of 3.2-6.2% for intraday precision and 7.1-9.0% for interday precision. The SPCE-electrochemical biosensor is simple, accurate, and without modification, showing great potential for point-of-care testing (POCT) of serum MI in clinical samples.
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Affiliation(s)
- Xinrui Jin
- Department of Laboratory Medicine, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Yuanqing Zhao
- Department of Laboratory Medicine, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Xiujuan Gu
- Department of Laboratory Medicine, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Min Zhong
- Department of Laboratory Medicine, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Xin Kong
- Department of Laboratory Medicine, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Guangrong Li
- Department of Laboratory Medicine, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Gang Tian
- Department of Laboratory Medicine, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Jinbo Liu
- Department of Laboratory Medicine, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
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