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Algethami FK, Marwani HM, Raza N, Asiri AM, Rahman MM. Non-enzymatic electrochemical detection of melamine in dairy products by using CuO decorated carbon nanotubes nanocomposites. Food Chem 2024; 445:138792. [PMID: 38387321 DOI: 10.1016/j.foodchem.2024.138792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Revised: 02/14/2024] [Accepted: 02/16/2024] [Indexed: 02/24/2024]
Abstract
Melamine, a typical nitrogen enriched organic compound exhibiting great potential in the industrial sector, is exploited as an adulterant to inflate protein levels in dairy products, can pose serious threats to humans and therefore necessitates its swift detection and precise quantification at its first exposure. In this investigation, sensitive and reliable sensor probes were fabricated using CuO nanoparticles and its nanocomposites (NCs) with carbon nanotubes (CNTs), carbon black (CB), and graphene oxide (GO) to promptly quantify melamine in dairy products. The optical, morphological, and structural characteristics of the CuO-CNT NCs were achieved using diverse instrumental techniques including UV-visible spectroscopy, transmission electron microscopy, X- ray diffraction, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy and etc. The fabrication of glassy carbon electrodes (GCE) was accomplished by coating CuO-CNT NCs through a binder (5 % nafion). These sensor probes demonstrated outstanding electrochemical sensor performance with CuO-CNT NCs/Nafion/GCE sensor probe in terms of very low limit of detection (0.27 nM), good linearity range (0.05-0.5 nM), and relatively high sensitivity (93.924 µA µM-1 m-2) for melamine under optimized experimental conditions. Furthermore, the performance of CuO-CNT NCs/Nafion/GCE coated sensor probes was practically validated for the selective melamine detection in the real sample analysis of commercially available milk brands, which revealed significant figures of merit in a very short response time of 10 s. From the results, it was concluded that the current study might be helpful in the development of an efficient commercial sensor based on ultra-sensitive transition metal oxides in the field of health care monitoring, food stuffs in a broader scale as well as food applications.
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Affiliation(s)
- Faisal K Algethami
- Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia.
| | - Hadi M Marwani
- Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; Center of Excellence for Advanced Materials Research (CEAMR), Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
| | - Nadeem Raza
- Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia; Department of Chemistry, Government Alamdar Hussain Islamia Degree College Multan, Pakistan
| | - Abdullah M Asiri
- Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; Center of Excellence for Advanced Materials Research (CEAMR), Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
| | - Mohammed M Rahman
- Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; Center of Excellence for Advanced Materials Research (CEAMR), Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
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2
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Rabbani G, Ahmad A, Zamzami MA, Baothman OA, Hosawi SA, Altayeb H, Shahid Nadeem M, Ahmad V. Fabrication of an affordable and sensitive corticosteroid-binding globulin immunosensor based on electrodeposited gold nanoparticles modified glassy carbon electrode. Bioelectrochemistry 2024; 157:108671. [PMID: 38401223 DOI: 10.1016/j.bioelechem.2024.108671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 02/09/2024] [Accepted: 02/19/2024] [Indexed: 02/26/2024]
Abstract
Herein, we fabricated an ultrasensitive electrochemical immunosensor for the quantitative detection of corticosteroid-binding globulin (CBG). CBG is a protein that regulates glucocorticoid levels and is an important biomarker for inflammation. A decrease in CBG levels is a key biomarker for inflammatory diseases, such as septic shock. To enhance the electrochemical performance and provide a large surface area for anti-CBG immobilization, we functionalized the glassy carbon electrode surface with AuNPs. Electrochemical characterization methods including cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to examine the construction of the fabricated immunosensor. The electrochemical signal demonstrated a remarkable sensitivity to the CBG antigen, with a detection range from 0.01 to 100 μg/mL and a limit of detection of 0.012 μg/mL, making it suitable for both clinical and research applications. This label-free immunosensor offers significant advantages, including high sensitivity, low detection limits and excellent selectivity, making it a promising tool for detecting CBG in complex biological samples. Its potential applications include early disease diagnosis, treatment monitoring and studying CBG-related physiological processes.
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Affiliation(s)
- Gulam Rabbani
- IT-medical Fusion Center, 350-27 Gumidae-ro, Gumi-si, Gyeongbuk 39253, Republic of Korea.
| | - Abrar Ahmad
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia.
| | - Mazin A Zamzami
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia
| | - Othman A Baothman
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia
| | - Salman A Hosawi
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia
| | - Hisham Altayeb
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia
| | - Muhammad Shahid Nadeem
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia
| | - Varish Ahmad
- Department of Health Information Technology, Faculty of Applied Studies, King Abdulaziz University, Jeddah 21589, Saudi Arabia
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Gokila N, Haldorai Y, Saravanan P, Rajendra Kumar RT. Non-enzymatic electrochemical impedance sensor for selective detection of electro-inactive organophosphate pesticides using Zr-MOF/ZrO 2/MWCNT ternary composite. Environ Res 2024; 251:118648. [PMID: 38462090 DOI: 10.1016/j.envres.2024.118648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 02/04/2024] [Accepted: 03/05/2024] [Indexed: 03/12/2024]
Abstract
The existence of multiple pesticide residues in fruits and vegetables constitutes a direct peril to living organisms. Therefore, it is crucial to develop a low-cost screening method for determining organophosphate pesticides (OPPs) in food samples. This study describes the solvothermal synthesis of a ternary composite comprising multi-walled carbon nanotubes (MWCNT), zirconium oxide, and a zirconium-metal-organic framework (Zr-MOF). The ternary composite was characterised using XRD, FESEM, FTIR, and BET. The ternary composite provides a large surface area (1158 m2/g) compared with the pristine Zr-MOF (868 m2/g). The composite-modified glassy carbon electrode was used to determine nine pesticides, including organophosphate (malathion, dimethoate, chlorpyrifos, monocrotophos, and glyphosate) and non-organophosphate (thiophanate methyl, carbendazim, atrazine, and 2,4, D). In particular, various chemical combinations of OPPs were selected, such as S-P=S, P=S, P=O, and non-OPPs such as C=S (with sulphur), and without sulphur. The sensor results show that the sensor selectivity is high for OPPs containing both phosphorus and sulphur molecules. The low detection limit of the sensor was 2.02, 2.8, 2.5, 1.11, and 2.01 nM for malathion, chlorpyrifos, dimethoate, monocrotophos, and glyphosate, respectively. The electrode exhibited significant chemical stability (93%) after 100 cycles, good repeatability, and a long shelf life. The sensor is reliable for qualitative real-time applications.
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Affiliation(s)
- N Gokila
- Advanced Materials and Devices Laboratory (AMDL), Department of Nanoscience and Technology, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India.
| | - Yuvaraj Haldorai
- Department of Physics, Dongguk University, Seoul, 04620, Republic of Korea.
| | - P Saravanan
- Advanced Magnetics Group, Defence Metallurgical Research Laboratory, Hyderabad, 500058, India.
| | - Ramasamy Thangavelu Rajendra Kumar
- Advanced Materials and Devices Laboratory (AMDL), Department of Nanoscience and Technology, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India.
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Rabbani G, Khan ME, Khan AU, Ali SK, Zamzami MA, Ahmad A, Bashiri AH, Zakri W. Label-free and ultrasensitive electrochemical transferrin detection biosensor based on a glassy carbon electrode and gold nanoparticles. Int J Biol Macromol 2024; 256:128312. [PMID: 38000589 DOI: 10.1016/j.ijbiomac.2023.128312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 11/19/2023] [Accepted: 11/19/2023] [Indexed: 11/26/2023]
Abstract
In this study, we developed a label-free and ultrasensitive electrochemical biosensor for the detection of transferrin (Tf), an important serum biomarker of atransferrinemia. The biosensor was fabricated by using glassy carbon electrode (GCE) and modified with gold nanoparticles (AuNPs) via electroless deposition. The electrochemical characteristics of the GCE-AuNPs biosensors were characterized using cyclic voltammetry and electrochemical impedance spectroscopy analysis. Differential pulse voltammetry was used for quantitative evaluation of the Tf-antigen by recording the increase in the anodic peak current of GCE-AuNPs biosensor. The GCE-AuNPs biosensor demonstrates superior sensing performance for Tf-antigen fortified in buffer, with a wide linear range of 0.1 to 5000 μg/mL and a limit of detection of 0.18 μg/mL. The studied GCE-AuNPs biosensor showed excellent sensitivity, selectivity, long-term storage stability and simple sensing steps without pretreatment of clinical samples. This GCE-AuNPs biosensor indicates great potential for developing a Tf detection platform, which would be helpful in the early diagnosis of atransferrinemia. The developed GCE-AuNPs biosensor holds great potential in biomedical research related to point of care for the early diagnosis and monitoring of diseases associated with aberrant serum transferrin levels. These findings suggest that the GCE-AuNPs biosensor has great potential for detecting other serum biomarkers.
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Affiliation(s)
- Gulam Rabbani
- IT-medical Fusion Center, 350-27 Gumidae-ro, Gumi-si, Gyeongbuk 39253, Republic of Korea
| | - Mohammad Ehtisham Khan
- Department of Chemical Engineering Technology, College of Applied Industrial Technology, Jazan University, 45142, Saudi Arabia.
| | - Anwar Ulla Khan
- Department of Electrical Engineering Technology, College of Applied Industrial Technology, Jazan University, 45142, Saudi Arabia
| | - Syed Kashif Ali
- Department of Chemistry, Faculty of Science, Jazan University, Jazan, PO Box 114, Saudi Arabia
| | - Mazin A Zamzami
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia
| | - Abrar Ahmad
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia
| | - Abdullateef H Bashiri
- Department of Mechanical Engineering, College of Engineering, Jazan University, P. O. Box 114, Jazan 45142, Saudi Arabia
| | - Waleed Zakri
- Department of Mechanical Engineering, College of Engineering, Jazan University, P. O. Box 114, Jazan 45142, Saudi Arabia
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Wan C, Qu A, Deng L, Liu X, Wu C. Preparation of electrochemical sensor based on glassy carbon electrode and its specificity and sensitivity for directional detection of antibiotic resistance genes spreading in the water environment. Environ Sci Pollut Res Int 2023; 30:7904-7913. [PMID: 36048394 DOI: 10.1007/s11356-022-22787-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 08/25/2022] [Indexed: 06/15/2023]
Abstract
Antibiotic-resistant bacteria/resistance genes (ARB/ARGs) have been paid much attention due to the environmental risks they might bring. They were demonstrated to be widespread in surface water and wastewater. Determining the concentrations of ARGs is the first step to evaluate the degree of pollution. In this study, electrochemical detection technology was studied due to its advantages of low cost, fast response, and satisfactory selectivity. Additionally, the electrochemical sensor technology was used to determine the concentration of a ubiquitous ARG (ampicillin gene blaTEM) in the water environment. A kind of electrochemical sensor was prepared on a glassy carbon electrode (GCE). The results of X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV) curves indicated that the single-stranded DNA (ssDNA) probe can be successfully immobilized on the surface of the GCE. In addition, the performance of hybridization between the ssDNA probe and the target DNA at diverse temperatures was compared, of which 35 °C was the optimum. Moreover, the change of charge transfer resistance (ΔRct) for the GCE sensor hybridizing with complementary DNA was much higher than that of DNA with the mismatched base, which indicated that the electrochemical sensor prepared in this study was specific. The sensitivity of the sensor was also proved by the strong correlation between the concentrations of ARGs and ΔRct (with the correlation coefficient (R2) of 0.9905). All in all, this study is meaningful for the comprehend on the detection of ARGs through the electrochemical method.
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Affiliation(s)
- Chunli Wan
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China
| | - Aoxuan Qu
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China
- Shanghai Chengtou Environmental Ecological Restoration Technology Co., Ltd., Shanghai, 200232, China
| | - Liyan Deng
- Research Center of Environmental Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Xiang Liu
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China
| | - Changyong Wu
- Research Center of Environmental Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
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Rajendran S, Manoj D, Suresh R, Vasseghian Y, Ghfar AA, Sharma G, Soto-Moscoso M. Electrochemical detection of hydrogen peroxide using micro and nanoporous CeO 2 catalysts. Environ Res 2022; 214:113961. [PMID: 35932831 DOI: 10.1016/j.envres.2022.113961] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 06/27/2022] [Accepted: 07/20/2022] [Indexed: 06/15/2023]
Abstract
In this research work, focus has been made on a glassy carbon electrode (GCE) modified commercial micro and synthesized nano-CeO2 for the detection of hydrogen peroxide (H2O2). Firstly, CeO2 nanoleaves were prepared by solvothermal route. Both commercially available micro CeO2 and synthesized nano-CeO2 structures were analyzed by different characterization techniques. The Raman spectra of synthesized nano CeO2 has more oxygen vacancies than micro CeO2. SEM images revealed that the synthesized CeO2 acquired leaf-like morphology. The catalyst nano CeO2 offered mesoporosity from nitrogen adsorption-desorption isotherms with massive sites of activation for increasing efficiency. Experiments on determining H2O2 using micro CeO2 or nano-CeO2/GCE was conducted using cyclic voltammetry (CV) and amperometry. Enhanced H2O2 reduction peak current with lower potential was observed in nano-CeO2/GCE. The influence of scan rate and H2O2 concentration on the performance of nano-CeO2/GCE were also studied. The obtained results have indicated that nano-CeO2/GCE showed improved electrochemical sensing behavior towards the reduction of H2O2 than micro-CeO2/GCE and bare GCE. A linear relationship was obtained over 0.001 μM-0.125 μM concentration of H2O2, with good sensitivity 141.96 μA μM-1 and low detection limit of 0.4 nM. Hence, the present nano-CeO2 system will have a great potential with solvothermal synthesis approach in the development of electrochemical sensors.
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Affiliation(s)
- Saravanan Rajendran
- Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Tarapacá, Avda. General Velásquez, 1775, Arica, Chile.
| | - Devaraj Manoj
- Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Tarapacá, Avda. General Velásquez, 1775, Arica, Chile
| | - R Suresh
- Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Tarapacá, Avda. General Velásquez, 1775, Arica, Chile
| | - Yasser Vasseghian
- Department of Chemistry, Soongsil University, Seoul, 06978, South Korea
| | - Ayman A Ghfar
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Gaurav Sharma
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC), Avda. Astrofísico Fco. Sánchez 3, 38206, La Laguna, Spain
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Senthil Kumar P, Sreeja BS, Krishna Kumar K, Padmalaya G. Investigation of Nafion coated GO-ZnO nanocomposite behaviour for sulfamethoxazole detection using cyclic voltammetry. Food Chem Toxicol 2022; 167:113311. [PMID: 35863482 DOI: 10.1016/j.fct.2022.113311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Revised: 07/06/2022] [Accepted: 07/14/2022] [Indexed: 11/25/2022]
Abstract
The electrochemical behavior of sulfamethoxazole (SMX) was investigated on the surface of the glassy carbon electrode with Nafion coated GO, ZnO, GO-ZnO nanocomposites using cyclic voltammetry (CV). The results of voltammetric studies exhibited a considerable increase in background current on SMX detection at nafion coated GO-ZnO nanocomposite GC electrodes. However, the adopted fabrication procedure for GC electrodes was reported previously but only difference is nafion was drop casted over the fabricated nanocomposite electrode. In order to investigate the electrochemical performance behavior of GO/GCE, ZnO/GCE, GO-ZnO/GCE, variation on ZnO amounts with Nafion coated and uncoated GO/GC electrodes were involved and it was analyzed using cyclic voltammetry in 5 mM K2FeCN6 using 0.1 M KCl solution electrolyte medium. In GO-ZnO/GC electrode, peak currents got reduced when compared with GO/GC electrode but their potential voltage difference (peak-to-peak) separation was increased. Similar results was observed for nafion coated GO-ZnO/GC electrode. On comparing the electrochemical process, the importance of nafion coated GO-ZnO nanocomposites were studied and proceeded with optimized amounts of modifier on the electrode surface for SMX detection. Thus Nf/GO-ZnO with different ZnO ratios performance showed significant response on determining SMX, resulting to progress as electrode sensor for health-care applications.
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Affiliation(s)
- P Senthil Kumar
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603110, Tamil Nadu, India; Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603 110, Tamil Nadu, India.
| | - B S Sreeja
- Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603 110, Tamil Nadu, India; Department of Electronics and Communication Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603110, Tamil Nadu, India
| | - K Krishna Kumar
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603110, Tamil Nadu, India; Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603 110, Tamil Nadu, India
| | - G Padmalaya
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603110, Tamil Nadu, India; Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603 110, Tamil Nadu, India
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Karadurmus L, Corman ME, Uzun L, Ozkan SA. Enantioselective recognition of esomeprazole with a molecularly imprinted sol-gel-based electrochemical sensor. Mikrochim Acta 2022; 189:225. [PMID: 35585299 DOI: 10.1007/s00604-022-05321-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 04/25/2022] [Indexed: 01/24/2023]
Abstract
A simple, selective, and accurate electrochemical chiral sensor based on molecularly imprinted polymer (MIP) has been developed for sensitive and selective detection of esomeprazole (ESOM). For this purpose, the porous MIP sensor was prepared using tetraethyl orthosilicate (TEOS) and cetyltrimethylammonium bromide (CTAB) in the presence of β-cyclodextrin (β-CD) as a chiral recognizing element on a glassy carbon electrode (GCE). The changes in the MIP-layer related to removal and rebinding of the target ESOM were performed via differential pulse voltammetry (DPV) and cyclic voltammetry (CV) by using [Fe(CN)6]3-/4- as the redox probe. The structures of the developed sensor surface were characterized by using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Electrochemical impedance spectroscopy (EIS) was also utilized for a complementary electrochemical characterization. The calibration curve was obtained in the range 1.0 × 10-14-2.0 × 10-13 M with a limit of detection (LOD) of 1.9 × 10-15 M. The developed method has improved the accessibility of binding sites by producing the porous material via hydrolysis/condensation reaction of TEOS in presence of CTAB. The selectivity tests of the developed SiO2-β-CD@MIP/GCE sensor indicated a high specificity towards ESOM compared with structurally related competitor molecules such as R-omeprazole (R-OM), R-lansoprazole, and S-lansoprazole. The developed sensor was successfully used to determine ESOM in tablets and commercial human serum samples with satisfactory recoveries (100.25 to 100.60%) and precision (RSD 0.46 to 0.66%).
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Hojatpanah MR, Khanmohammadi A, Khoshsafar H, Hajian A, Bagheri H. Construction and application of a novel electrochemical sensor for trace determination of uranium based on ion-imprinted polymers modified glassy carbon electrode. Chemosphere 2022; 292:133435. [PMID: 34958794 DOI: 10.1016/j.chemosphere.2021.133435] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/17/2021] [Accepted: 12/23/2021] [Indexed: 06/14/2023]
Abstract
In the present work, a novel electrochemical sensor modified glassy carbon electrode with ion-imprinted polymers (IIP-GCE) was applied for uranyl ions (UO22+) determination. Surface modifier was synthesized through precipitation polymerization method, using acrylic acid as a monomer, benzoyl peroxide (BPO) as initiator, and trimethylolpropane triacrylate (TMPTA) as cross-linker. A new uranyl-trans-3-(3-pyridyl) acrylic acid complex was employed, serving as an active and specific site on the synthesized modifier. Next, the synthesized modifier was characterized using X-ray diffraction (XRD), Scanning Electron microscopy (SEM), and Fourier Transform Infrared Spectroscopy (FT-IR) techniques. UO22+ ions were detected using a differential pulse adsorptive anodic stripping voltammetry method. Under the optimized conditions (pH = 8.0, pre-concentration time = 10 min and pre-concentration potential = -0.30 V), the modified electrode exhibited linear behavior in the interval of 1.27-95.49 μg.L-1 with a limit of detection (LOD) of 0.43 μg.L-1. Also, the constructed ion-imprinted sensor showed a successful application for determining UO22+ ions with recovery range of 97.6-101% in real samples.
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Affiliation(s)
- Mohammad Reza Hojatpanah
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Akbar Khanmohammadi
- Research and Development Department, Farin Behbood Tashkhis LTD, Tehran, Iran
| | - Hosin Khoshsafar
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Ali Hajian
- Institute of Sensor and Actuator Systems, TU Wien, Vienna, Austria
| | - Hasan Bagheri
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran.
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Mehmandoust M, Uzcan F, Soylak M, Erk N. Dual-response electrochemical electrode for sensitive monitoring of topotecan and mitomycin as anticancer drugs in real samples. Chemosphere 2022; 291:132809. [PMID: 34785182 DOI: 10.1016/j.chemosphere.2021.132809] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 10/25/2021] [Accepted: 11/04/2021] [Indexed: 06/13/2023]
Abstract
This research paper employed an innovative electrochemical electrode to simultaneously determine topotecan (TPT) and mitomycin (MMC) as anticancer agents. For this purpose, a novel nanocomposite was synthesized using a hydrothermal procedure. The nanocomposites were characterized using FTIR, STEM, FESEM, mapping analysis, EDX, and XRD methods. The novelty of this work is the successful synthesis of Fe3O4 decorated on the surface of CuCo2S4 (Fe3O4@CuCo2S4) nanocomposites showed two separate anodic peaks at 0.8 V for TPT and 1.0 V for MMC with potential separation of 0.2 V. This was enough for the simultaneous electrochemical determination of topotecan and mitomycin on a glassy carbon electrode (GCE), simultaneously. At optimized conditions, the developed electrode exhibited linear responses with TPT and MMC concentration in the ranges of 0.01-0.89 and 0.89-8.95 μM for topotecan and 0.1-19.53 μM for mitomycin. The detection limits were observed as 6.94 nM and 80.00 nM for topotecan and mitomycin, respectively. The fabricated Fe3O4@CuCo2S4/GCE showed high sensitivity, long-term stability, and repeatability towards the sensing of TPT and MMC simultaneously and can be utilized in real samples. The obtained results confirmed that the fabricated Fe3O4@CuCo2S4/GCE nanocomposites can be utilize in the simultaneous electrochemical determination of topotecan and mitomycin in real samples.
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Affiliation(s)
- Mohammad Mehmandoust
- Ankara University, Faculty of Pharmacy, Department of Analytical Chemistry, 06560, Ankara, Turkey; Sakarya University, Biomaterials, Energy, Photocatalysis, Enzyme Technology, Nano & Advanced Materials, Additive Manufacturing, Environmental Applications, and Sustainability Research & Development Group (BIOENAMS R&D Group), 54187, Sakarya, Turkey.
| | - Furkan Uzcan
- Erciyes University, Faculty of Sciences, Department of Chemistry, 38039, Kayseri, Turkey; Technology Research & Application Center (TAUM), Erciyes University, 38039, Kayseri, Turkey
| | - Mustafa Soylak
- Erciyes University, Faculty of Sciences, Department of Chemistry, 38039, Kayseri, Turkey; Technology Research & Application Center (TAUM), Erciyes University, 38039, Kayseri, Turkey; Turkish Academy of Sciences (TUBA), Cankaya, Ankara, Turkey
| | - Nevin Erk
- Ankara University, Faculty of Pharmacy, Department of Analytical Chemistry, 06560, Ankara, Turkey; Sakarya University, Biomaterials, Energy, Photocatalysis, Enzyme Technology, Nano & Advanced Materials, Additive Manufacturing, Environmental Applications, and Sustainability Research & Development Group (BIOENAMS R&D Group), 54187, Sakarya, Turkey.
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Supchocksoonthorn P, Alvior Sinoy MC, de Luna MDG, Paoprasert P. Facile fabrication of 17β-estradiol electrochemical sensor using polyaniline/carbon dot-coated glassy carbon electrode with synergistically enhanced electrochemical stability. Talanta 2021; 235:122782. [PMID: 34517640 DOI: 10.1016/j.talanta.2021.122782] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Revised: 06/18/2021] [Accepted: 08/02/2021] [Indexed: 12/26/2022]
Abstract
Previous 17β-estradiol sensors required expensive reagents or complicated fabrication of sensing probes. In this work, a cheap, simple, and reusable electrochemical sensor based on commercially available polyaniline (PANI) and carbon dots (CDs) synthesized from iota-carrageenan was developed for the sensitive detection of 17β-estradiol. The sensor was simply prepared by drop-casting CDs/PANI composite on a glassy carbon electrode (GCE) using poly(vinylidene fluoride) as a binder. With synergistic contributions from both CDs and PANI, the CDs-PANI/GCE was much more electrochemically stable than the CDs/GCE or PANI/GCE. The CDs-PANI/GCE was sensitive to 17β-estradiol across a linear range from 0.001 to 100 μmol L-1 with a detection limit of 43 nmol L-1. The electrochemical measurement can be performed in 2 min and the probe can be reused for several hundred times. The CDs-PANI/GCE was selective towards 17β-estradiol against several interferences and gave excellent recovery between 94.4 and 103.7 % from real sample analysis. From intensive investigation on electron transfer process and energy levels, the oxidation reaction of 17β-estradiol occurred on the surface of CDs-PANI/GCE via favorable energy levels and dominantly surface adsorption process through π-π stacking and hydrogen bonding between 17β-estradiol and CDs/PANI. Such unique interfacial interactions also resulted in the synergistically enhanced electrochemical stability of the modified electrode.
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Affiliation(s)
| | - Ma Concepcion Alvior Sinoy
- Department of Chemical Engineering, University of the Philippines, Diliman, 1101, Quezon City, Philippines
| | - Mark Daniel G de Luna
- Department of Chemical Engineering, University of the Philippines, Diliman, 1101, Quezon City, Philippines
| | - Peerasak Paoprasert
- Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathumthani, 12120 Thailand.
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12
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Saha M, Das S. Free radical induced activity of an anthracycline analogue and its Mn II complex on biological targets through in situ electrochemical generation of semiquinone. Heliyon 2021; 7:e07746. [PMID: 34458604 DOI: 10.1016/j.heliyon.2021.e07746] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 07/08/2021] [Accepted: 08/06/2021] [Indexed: 11/24/2022] Open
Abstract
Cytotoxicity by anthracycline antibiotics is attributed to several pathways. Important among them are formation of free-radical intermediates. However, their generation makes anthracyclines cardiotoxic which is a concern on their use as anticancer agents. Hence, any change in redox behavior that address cardiotoxicity is welcome. Modulation of redox behavior raises the fear that cytotoxicity could be compromised. Regarding the generation of free radical intermediates on anthracyclines, a lot depends on the surrounding environment (oxic or anoxic), polarity and pH of the medium. In case of anthracyclines, one-electron reduction to semiquinone or two-electron reduction to quinone-dianion are crucial both for cytotoxicity and for cardiotoxic side effects. The disproportion-comproportionation equilibria at play between quinone-dianion, free quinone and semiquinone control biological activity. Whatever is the form of reduction, semiquinones are generated as a consequence of the presence of anthracyclines and these interact with a biological target. Alizarin, a simpler anthracycline analogue and its MnII complex were subjected to electrochemical reduction to realize what happens when anthracyclines are reduced by compounds present in cells as members of the electron transport chain. Glassy carbon electrode maintained at the pre-determined reduction potential of a compound was used for reduction of the compounds. Nucleobases and calf thymus DNA that were maintained in immediate vicinity of such radical generation were used as biological targets. Changes due to the generated species under aerated/de-aerated conditions on nucleobases and on DNA helps one to realize the process by which alizarin and its MnII complex might affect DNA. The study reveals alizarin was more effective on nucleobases than the complex in the free radical pathway. Difference in damage caused by alizarin and the MnII complex on DNA is comparatively less than that observed on nucleobases; the complex makes up for any inefficacy in the free radical pathway by its other attributes.
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13
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Dantas MSR, Lourenço AS, Silva AC, Bichinho KM, Araujo MCU. Simultaneous determination of methyl, ethyl, propyl, and butyl parabens in sweetener samples without any previous pretreatment using square wave voltammetry and multiway calibration. Food Chem 2021; 365:130472. [PMID: 34265641 DOI: 10.1016/j.foodchem.2021.130472] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 05/26/2021] [Accepted: 06/24/2021] [Indexed: 01/18/2023]
Abstract
Parabens are compounds used as chemical preservatives in cosmetics, drugs, and food. Some can cause adverse effects on human health. In this study, a square wave voltammetric method using a glassy carbon electrode was developed for simultaneous determination of methyl, ethyl, propyl, and butyl parabens in sweeteners. To overcome the strong overlap of voltammetric signals caused by calibrated and uncalibrated constituents, unfolded partial least squares with residual bilinearization (U-PLS/RBL) was used. The U-PLS/RBL calibration model was constructed and evaluated using a validation set obtained using a Taguchi design. Satisfactory and unbiased results were obtained with a linear response in the range of 0.78-4.48 μmol L-1 and recoveries from 82.64% to 121.77%. As far as the authors know, a voltammetric method that simultaneously determines four parabens in complex samples such as sweeteners without any previous pretreatment has not yet been reported in the literature.
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Affiliation(s)
- Maria S R Dantas
- Universidade Federal da Paraíba, Departamento de Química, 58051-970 João Pessoa, Paraíba, Brazil
| | - Anabel S Lourenço
- Universidade Federal da Paraíba, Departamento de Química, 58051-970 João Pessoa, Paraíba, Brazil
| | - Amanda C Silva
- Instituto Federal da Paraíba, Química, 58999-000 Sousa, Paraíba, Brazil
| | - Kátia M Bichinho
- Universidade Federal da Paraíba, Departamento de Química, 58051-970 João Pessoa, Paraíba, Brazil
| | - Mario C U Araujo
- Universidade Federal da Paraíba, Departamento de Química, 58051-970 João Pessoa, Paraíba, Brazil.
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14
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Eftekhari A, Dalili M, Karimi Z, Rouhani S, Hasanzadeh A, Rostamnia S, Khaksar S, Idris AO, Karimi-Maleh H, Yola ML, Msagati TAM. Sensitive and selective electrochemical detection of bisphenol A based on SBA-15 like Cu-PMO modified glassy carbon electrode. Food Chem 2021; 358:129763. [PMID: 34000688 DOI: 10.1016/j.foodchem.2021.129763] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2020] [Revised: 03/21/2021] [Accepted: 04/05/2021] [Indexed: 01/29/2023]
Abstract
This work reports the electrochemical detection of bisphenol A (BPA) using a novel and sensitive electrochemical sensor based on the Cu functionalized SBA-15 like periodic mesoporous organosilica-ionic liquid composite modified glassy carbon electrode (Cu@TU-PMO/IL/GCE). The structural morphology of Cu@TU-PMO is characterized by X-ray powder diffraction (XRD), energy dispersive X-ray analysis (EDX), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), Field emission scanning electron microscopy (FE-SEM), and Brunauer-Emmett-Teller (BET). The catalytic activity of the modified electrode toward oxidation of BPA was interrogated with cyclic voltammetry (CV) and differential pulse voltammetry (DPV) in phosphate buffer solution (pH 7.0) using the fabricated sensor. The electrochemical detection of the analyte was carried out at a neutral pH and the scan rate studies revealed that the sensor was stable. Under the optimal conditions, a linear range from 5.0 nM to 2.0 µM and 4.0 to 500 µM for detecting BPA was observed with a detection limit of 1.5 nM (S/N = 3). The sensor was applied to detect BPA in tap and seawater samples, and the accuracy of the results was validated by high-performance liquid chromatography (HPLC). The proposed method provides a powerful tool for the rapid and sensitive detection of BPA in environmental samples.
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Affiliation(s)
- Aziz Eftekhari
- Maragheh University of Medical Sciences, PO Box: 78151-55158, Maragheh, Iran.
| | - Maryam Dalili
- Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, PO BOX 55181-83111, Maragheh, Iran
| | - Ziba Karimi
- Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, PO BOX 55181-83111, Maragheh, Iran
| | - Shamila Rouhani
- Institute for Nanotechnology and Water Sustainability (iNanoWS), College of Science, Engineering and Technology, University of South Africa, Johannesburg 1709, South Africa
| | - Amir Hasanzadeh
- Maragheh University of Medical Sciences, PO Box: 78151-55158, Maragheh, Iran.
| | - Sadegh Rostamnia
- Organic and Nano Group (ONG), Department of Chemistry, Iran University of Science and Technology (IUST), PO Box 16846-13114, Tehran, Iran; Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, PO BOX 55181-83111, Maragheh, Iran.
| | - Samad Khaksar
- School of Science and Technology, The University of Georgia, Tbilisi, Georgia
| | - Azeez Olayiwola Idris
- Institute for Nanotechnology and Water Sustainability (iNanoWS), College of Science, Engineering and Technology, University of South Africa, Johannesburg 1709, South Africa
| | - Hassan Karimi-Maleh
- School of Resources and Environment, University of Electronic Science and Technology of China, P.O. Box 611731, Xiyuan Ave, Chengdu, PR China; Department of Chemical Engineering, Quchan University of Technology, Quchan 9477177870, Iran; Department of Chemical Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein Campus, 2028 Johannesburg, South Africa.
| | - Mehmet Lütfi Yola
- Hasan Kalyoncu University, Faculty of Health Sciences, Department of Nutrition and Dietetics, Gaziantep, Turkey
| | - Titus A M Msagati
- Institute for Nanotechnology and Water Sustainability (iNanoWS), College of Science, Engineering and Technology, University of South Africa, Johannesburg 1709, South Africa
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15
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Ghanbari MH, Sharafi P, Nayebossadr S, Norouzi Z. Utilizing a nanocomposite consisting of zinc ferrite, copper oxide, and gold nanoparticles in the fabrication of a metformin electrochemical sensor supported on a glassy carbon electrode. Mikrochim Acta 2020; 187:557. [PMID: 32914228 DOI: 10.1007/s00604-020-04529-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 08/21/2020] [Indexed: 01/29/2023]
Abstract
The conception and development of a new electrochemical sensor is reported for the detection of metformin (MET). Zinc ferrite and copper oxide nanostructure (ZnFe2O4-CuO) and gold nanoparticles (AuNPs) have been used to prepare a nanocomposite in modifying a glassy carbon electrode (GCE). The unique ZnFe2O4-CuO/Au nanocomposite was applied as a sensor for the determination of traces of MET by some electroanalytical techniques. Experimental parameters affecting the results were investigated and optimized. Under the optimum conditions and at a working potential of 0.85 V (vs. Ag/AgCl/3.0 M KCl), the sensor response is linear in the MET range of 1.0 nmol L-1 to 1.0 μmol L-1 MET. The limit of detection (LOD) is 0.3 nmol L-1 (at an S/N ratio of 3) and the sensitivity is 1.13 μA μmol L-1 cm-2. The sensor was applied to the determination of MET in real samples where it gave acceptable results. Graphical abstract.
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Affiliation(s)
| | - Parastoo Sharafi
- Department of Chemistry, Payame Noor University, Tehran, 19395-3697, Iran
| | | | - Zahra Norouzi
- Faculty of Chemistry, University of Kashan, Kashan, 87317-51167, Iran
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16
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Hung CM, Huang CP, Chen SK, Chen CW, Dong CD. Electrochemical analysis of naproxen in water using poly(l-serine)-modified glassy carbon electrode. Chemosphere 2020; 254:126686. [PMID: 32320830 DOI: 10.1016/j.chemosphere.2020.126686] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 03/29/2020] [Accepted: 03/31/2020] [Indexed: 06/11/2023]
Abstract
A poly(l-serine)-modified glassy carbon electrode (PLS/GCE) was fabricated by electropolymerization and used to study the detection of naproxen (NPX), a representative non-steroidal anti-inflammatory drug, in phosphate buffer supporting electrolyte at pH 5.0. Results indicated that the PLS/GCE was capable of determination of NPX at a working potential of 0.92 (vs. Ag/AgCl) in voltammetry mode. Experimental factors such as scan rate, accumulation time, solution pH, initial NPX concentration, and interferences were optimized for NPX determination efficiency. The morphology and elemental distribution of the electrode surface were characterized by ESEM, TEM, PSD, XRD, FTIR, TGA, XPS, and zeta potential. NPX oxidation current increased with increasing analyte concentration and scan rate but decreased with increasing pH. Linear sweep voltammetry calibration curve was established in the NPX concentration range of 4.3-65 μM, with detection limit and average recovery of 0.69 μM (n = 3) and 104 ± 2.5%, respectively. PLS/GCE is simple, accurate, reproducible, and easy for operation, therefore would be cost-effective for the determination of NPX.
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Affiliation(s)
- Chang-Mao Hung
- Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan
| | - C P Huang
- Department of Civil and Environmental Engineering, University of Delaware, Newark, USA
| | - Shih-Kai Chen
- Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan
| | - Chiu-Wen Chen
- Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan.
| | - Cheng-Di Dong
- Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan.
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17
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Mahnashi MH. Synthesis of three-dimensional nickel ferrite nanospheres decorated activated graphite nanoplatelets for electrochemical detection of vortioxetine with pharmacokinetic insights in human volunteers. Mikrochim Acta 2020; 187:519. [PMID: 32852618 DOI: 10.1007/s00604-020-04523-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 08/19/2020] [Indexed: 12/23/2022]
Abstract
An innovative electrochemical nanoprobe was developed for determination of vortioxetine (VORT), a serotonergic antidepressant drug, for the first time. The fabrication of the nanoprobe is based on decoration of a glassy carbon electrode with three-dimensional nickel ferrite nanospheres modified activated graphite nanoplatelets (3D NiFe2O4 NS/AGNP/GCE). The morphological characterization of the nanoprobe was carried out via scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, energy dispersive X-ray spectroscopy (EDS), N2-adsorption-desorption isotherm, and powder X-ray spectroscopy (PXRD). In addition, the electrochemical behavior of the nanoprobe was described using cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). A well-defined and irreversible peak at 0.82 V was seen at the surface of 3D NiFe2O4 NS/AGNP/GCE. The proposed nanoprobe exhibited outstanding electro-catalytic activity towards VORT oxidation. Under the optimized conditions, the anodic oxidation currents were linearly proportional to VORT concentration at the working range 1.8-90 nM with a LOD of 0.55 nM. The nanoprobe was used to determine VORT in pharmaceutical tablets and human plasma samples. Satisfactory recoveries and RSD percentages were obtained in the range 103.8-107.7% (RSD% = 2.7-3.1%) and 101.4-105.3% (RSD % = 2.8-3.4%) for tablets and plasma samples, respectively. Moreover, the method was used to monitor VORT during a pharmacokinetic study in human volunteers with satisfactory results. The 3D NiFe2O4 NS/AGNP/GCE shows excellent sensitivity, reproducibility, and selectivity towards VORT detection. The proposed electrode could be utilized as simple, rapid, and inexpensive sensing tool for routine analysis and during pharmacokinetic/pharmacodynamic investigations. Graphical abstract.
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Affiliation(s)
- Mater H Mahnashi
- Department of Pharmaceutical Chemistry, College of Pharmacy, Najran University, Najran, Saudi Arabia.
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18
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Mollarasouli F, Dogan-Topal B, Caglayan MG, Taskin-Tok T, Ozkan SA. Electrochemical, spectroscopic, and molecular docking studies of the interaction between the anti-retroviral drug indinavir and dsDNA. J Pharm Anal 2020; 10:473-481. [PMID: 33133731 PMCID: PMC7591812 DOI: 10.1016/j.jpha.2020.08.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 08/05/2020] [Accepted: 08/05/2020] [Indexed: 12/24/2022] Open
Abstract
In this study, an electrochemical DNA biosensor was developed using a straightforward methodology to investigate the interaction of indinavir with calf thymus double-stranded deoxyribonucleic acid (ct-dsDNA) for the first time. The decrease in the oxidation signals of deoxyguanosine (dGuo) and deoxyadenosine (dAdo), measured by differential pulse voltammetry, upon incubation with different concentrations of indinavir can be attributed to the binding mode of indinavir to ct-dsDNA. The currents of the dGuo and dAdo peaks decreased linearly with the concentration of indinavir in the range of 1.0–10.0 μg/mL. The limit of detection and limit of quantification for indinavir were 0.29 and 0.98 μg/mL, respectively, based on the dGuo signal, and 0.23 and 0.78 μg/mL, respectively, based on the dAdo signal. To gain further insights into the interaction mechanism between indinavir and ct-dsDNA, spectroscopic measurements and molecular docking simulations were performed. The binding constant (Kb) between indinavir and ct-dsDNA was calculated to be 1.64 × 108 M−1, based on spectrofluorometric measurements. The obtained results can offer insights into the inhibitory activity of indinavir, which could help to broaden its applications. That is, indinavir can be used to inhibit other mechanisms and/or hallmarks of viral diseases. Electrochemical DNA biosensor was fabricated for indinavir-DNA interaction study. Indinavir was interacted with ct-dsDNA and made eight hydrogen bonds. The Kb was calculated to be 1.64 × 108 M−1 by spectrofluorometry.
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Affiliation(s)
- Fariba Mollarasouli
- Ankara University, Department of Analytical Chemistry, 06560, Ankara, Turkey.,Department of Chemistry, Yasouj University, Yasouj, 75918-74831, Iran
| | - Burcu Dogan-Topal
- Ankara University, Department of Analytical Chemistry, 06560, Ankara, Turkey
| | | | - Tugba Taskin-Tok
- Department of Chemistry, Gaziantep University, 27310, Gaziantep, Turkey.,Institute of Health Sciences, Department of Bioinformatics and Computational Biology, Gaziantep University, 27310, Gaziantep, Turkey
| | - Sibel A Ozkan
- Ankara University, Department of Analytical Chemistry, 06560, Ankara, Turkey
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19
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Ağin F, Atal S. Electroanalytical Determination of the Antiinflammatory Drug Tenoxicam in Pharmaceutical Dosage Forms. Turk J Pharm Sci 2020; 16:184-190. [PMID: 32454712 DOI: 10.4274/tjps.galenos.2018.60783] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 03/15/2018] [Indexed: 12/01/2022]
Abstract
Objectives The electro-oxidation behavior of the non-steroidal anti-inflammatory drug tenoxicam (TX) was studied on multiwalled carbon nanotube (MWCNT)-modified glassy carbon electrode (GCE) by cyclic voltammetry, differential pulse voltammetry (DPV), and square wave voltammetry (SWV). Materials and Methods The GCE was modified with MWCNT for sensitive determination of TX by voltammetric methods. Results The current peaks for TX occurred at around 0.520 V for DPV and 0.570 V for SWV when the potential was scanned in the positive direction. The oxidation process of TX showed irreversible and diffusion-controlled behavior. The linear responses were obtained in the range from 2×10-7 to 1×10-5 M with the limit of detection (LOD) 1.43×10-9 for DPV and from 8×10-9 to 8×10-6 with the LOD 9.97×10-10 for SWV in 1 M acetate buffer solution at pH 5.5. Conclusion Fully validated DPV and SWV were successfully applied for the determination of TX from pharmaceutical dosage form and yielded satisfying results.
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Affiliation(s)
- Fatma Ağin
- Karadeniz Technical University, Faculty of Pharmacy, Department of Analytical Chemistry, Trabzon, Turkey
| | - Sena Atal
- Karadeniz Technical University, Faculty of Pharmacy, Department of Analytical Chemistry, Trabzon, Turkey
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20
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Beitollahi H, Zaimbashi R, Mahani MT, Tajik S. A label-free aptasensor for highly sensitive detection of homocysteine based on gold nanoparticles. Bioelectrochemistry 2020; 134:107497. [PMID: 32222669 DOI: 10.1016/j.bioelechem.2020.107497] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 03/02/2020] [Accepted: 03/02/2020] [Indexed: 11/25/2022]
Abstract
In the present study, an original electrode fabrication approach was devised to create a label free sensitive electrochemical aptasensor for the detection of Homocysteine (Hcy) (Homocysteine signal was used for detection). To bind certain targets, synthetic oligonucleotides used as aptamers (APs) were specifically selected. Aptamers are substitutes for antibodies for analytical devices because of their sensitivity and high affinity. In this study, Hcy-Binding-Aptamer (HBA) was grafted onto the surface of Au nanoparticles/Glassy Carbon Electrode (Au/GCE) in order to create an aptasensor. The effects of buffer concentration, buffer type, interaction time, and aptamer concentration were investigated and optimized. In addition, Differential Pulse Voltammetry (DPV) was implemented to identify homocysteine. Favorable performance was achieved at a detection limit of 0.01 μM (S/N = 3) and linear range 0.05-20.0 μM. Furthermore, the fabricated aptasensor displayed desirable stability and reproducibility. The developed electrochemical aptasensor was found to have reasonable selectivity for the detection of homocysteine in the presence of cysteine and methionine. Analysis of real samples showed good ability of the proposed homocysteine biosensor to provide sensitive, quick, easy, and cost effective measurement of homocysteine in human blood serum and urine samples.
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Affiliation(s)
- Hadi Beitollahi
- Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.
| | - Reza Zaimbashi
- Department of Chemistry, Graduate University of Advanced Technology, Kerman, Iran
| | - Masoud Torkzadeh Mahani
- Department of Biotechnology, Institute of Science, High Technology & Environmental Science, Graduate University of Advance Technology, Kerman, Iran
| | - Somayeh Tajik
- Research Center for Tropical and Infectious Diseases, Kerman University of Medical Sciences, Kerman, Iran
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21
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Fernandes IPG, Oliveira-Brett AM. Caveolin proteins electrochemical oxidation and interaction with cholesterol. Bioelectrochemistry 2020; 133:107451. [PMID: 32109845 DOI: 10.1016/j.bioelechem.2019.107451] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 12/19/2019] [Accepted: 12/19/2019] [Indexed: 12/17/2022]
Abstract
Caveolae consist in lipid raft domains composed of caveolin proteins, cholesterol, glycosphingolipids, and GPI-anchored proteins. Caveolin proteins present three different types, caveolin 1 (CAV-1), caveolin 2 (CAV-2) and caveolin 3 (CAV-3), with a very similar structure and amino acid composition. The native caveolin proteins oxidation mechanism was investigated for the first time, at a glassy carbon electrode, using cyclic, square wave and differential pulse voltammetry. The three native caveolin proteins oxidation mechanism presented only one tyrosine and tryptophan amino acid residues oxidation peak. Denatured caveolin proteins presented also the tyrosine, tryptophan and cysteine amino acid residues oxidation peaks. The reverse cholesterol transport is related to caveolae and caveolin proteins, and CAV-1 is directly connected to cholesterol transport. The influence of cholesterol on the three caveolin proteins electrochemical behaviour was evaluated. In the absence and in the presence of cholesterol, significant differences in the CAV-1 oxidation peak current were observed.
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Affiliation(s)
- Isabel P G Fernandes
- Department of Chemistry, Faculty of Sciences and Technology, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Ana Maria Oliveira-Brett
- Department of Chemistry, Faculty of Sciences and Technology, University of Coimbra, 3004-535 Coimbra, Portugal.
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22
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Oloketuyi S, Mazzega E, Zavašnik J, Pungjunun K, Kalcher K, de Marco A, Mehmeti E. Electrochemical immunosensor functionalized with nanobodies for the detection of the toxic microalgae Alexandrium minutum using glassy carbon electrode modified with gold nanoparticles. Biosens Bioelectron 2020; 154:112052. [PMID: 32056958 DOI: 10.1016/j.bios.2020.112052] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Revised: 01/22/2020] [Accepted: 01/24/2020] [Indexed: 12/28/2022]
Abstract
In this work an electrochemical immunosensor for the toxic microalgae Alexandrium minutum (A. minutum AL9T) detection is described. A glassy carbon electrode (GCE) was modified by depositing gold nanoparticles followed by L-cysteine for obtaining a self-assembled monolayer. The SpyTagged nanobody C1, specific for the A. minutum toxic strain AL9T, was then covalently immobilized via SpyCatcher on the surface of the modified electrode and used for the selective capture of such microalgae strain. Electrochemical impedance spectroscopy (EIS) was used for the quantification of A. minutum cells present in water samples by measuring the charge-transfer resistance changes of the electrode with a hexacyanoferrate probe. Each electrode modification step was accompanied by cyclic voltammetry (CV) and scanning electron microscopy (SEM). The immunosensor provided highly reproducible data, was simple to fabricate at low cost, exhibited higher sensitivity than previously described alternative diagnostic methods and showed a broad linear range between 103 and 109 cells L-1 with detection limit of 3 × 103 cells L-1 of A. minutum AL9T. The immunosensor was successfully applied to quantify A. minutum AL9T in seawater and brackish water samples proving that it can be used for early detection of harmful microalgae without the necessity of pre-concentration or dialysis steps.
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Affiliation(s)
- Sandra Oloketuyi
- Laboratory of Environmental and Life Sciences, University of Nova Gorica, Vipavska cesta 13, SI-5000, Rožna Dolina (Nova Gorica), Slovenia
| | - Elisa Mazzega
- Laboratory of Environmental and Life Sciences, University of Nova Gorica, Vipavska cesta 13, SI-5000, Rožna Dolina (Nova Gorica), Slovenia
| | - Janez Zavašnik
- Department for Nanostructured Materials, Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia
| | - Kingkan Pungjunun
- Electrochemistry and Optical Spectroscopy Center of Excellence (EOSCE), Department of Chemistry, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Kurt Kalcher
- Institute of Chemistry, Analytical Chemistry, Karl-Franzens University, Universitätsplatz 1, Graz, A-8010, Austria
| | - Ario de Marco
- Laboratory of Environmental and Life Sciences, University of Nova Gorica, Vipavska cesta 13, SI-5000, Rožna Dolina (Nova Gorica), Slovenia.
| | - Eda Mehmeti
- Institute of Chemistry, Analytical Chemistry, Karl-Franzens University, Universitätsplatz 1, Graz, A-8010, Austria.
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Khoshnevisan K, Honarvarfard E, Torabi F, Maleki H, Baharifar H, Faridbod F, Larijani B, Khorramizadeh MR. Electrochemical detection of serotonin: A new approach. Clin Chim Acta 2019; 501:112-119. [PMID: 31715139 DOI: 10.1016/j.cca.2019.10.028] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 10/22/2019] [Accepted: 10/22/2019] [Indexed: 11/24/2022]
Abstract
Serotonin (5-hydroxytryptamine, 5-HT) is an important neurotransmitter which plays a significant role in various functions in the body, such as appetite, emotions, and autonomic functions. It is well known that biomarker 5-HT levels can be correlated to several diseases and disorders such as depression, anxiety, irritable bowel, and sleep trouble. Among various methods for detecting the 5-HT biomarker, electrochemical techniques have attracted great interest due to their low cost and ease of operation. However, sensitive and precise electrochemical detection of 5-HT levels is not possible using bare electrodes, thus requiring electrode modification. The present review aims to describe the different electroanalytical methods for 5-HT detection using various surface-modified electrodes such as glassy carbon, carbon fiber, diamond, graphite, and metal electrodes modified with conductive polymers. Perspectives and the modification of electrode surface using applied polymers for 5-HT detection have also been presented.
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Affiliation(s)
- Kamyar Khoshnevisan
- Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran; Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran.
| | - Elham Honarvarfard
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, NY 13699-5810, USA
| | - Farzad Torabi
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran; Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Hassan Maleki
- Department of Medical Nanotechnology, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Hadi Baharifar
- Department of Medical Nanotechnology, Applied Biophotonics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Farnoush Faridbod
- Department of Medical Nanotechnology, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Bagher Larijani
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Reza Khorramizadeh
- Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran; Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran.
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24
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Morawska K, Festinger N, Chwatko G, Głowacki R, Ciesielski W, Smarzewska S. Rapid electroanalytical procedure for sesamol determination in real samples. Food Chem 2020; 309:125789. [PMID: 31704073 DOI: 10.1016/j.foodchem.2019.125789] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 10/22/2019] [Accepted: 10/22/2019] [Indexed: 12/17/2022]
Abstract
In this study, the development of an electroanalytical assay based on square wave voltammetry technique for determining sesamol (Ses) in sesame oil samples is described. The influence of various factors such as pH of the supporting electrolyte, its composition, and SW (square wave) parameters was studied. Linearity of the peak current depended on the concentration of Ses in the range from 3.0 to 140.0 μmol L-1 with a limit of detection of 0.71 μmol L-1. Furthermore, the cyclic voltammetric behavior of Ses and the effects of scan rate and pH on the peak current and peak potential of Ses were determined. Moreover, the electrode process was found to be diffusion-controlled. The proposed methodology was successfully applied for determining Ses in commercial sesame oil samples. The obtained results were in good agreement with the results from the HPLC-UV reference method.
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25
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Afzali M, Mostafavi A, Shamspur T. Developing a novel sensor based on ionic liquid molecularly imprinted polymer/gold nanoparticles/graphene oxide for the selective determination of an anti-cancer drug imiquimod. Biosens Bioelectron 2019; 143:111620. [PMID: 31454692 DOI: 10.1016/j.bios.2019.111620] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 08/03/2019] [Accepted: 08/19/2019] [Indexed: 12/12/2022]
Abstract
Despite its useful properties, imiquimod (IMQ), known as an anti-cancer drug, can be harmful to the skin at high concentrations. Therefore, we have developed a novel electrochemical sensor to determine IMQ, for the first time. A glassy carbon electrode (GCE) was modified by a new composite comprising of ionic liquid-based molecularly imprinted polymer (MIP) and gold nanoparticles/graphene oxide (Au/GO). The MIP/Au/GO nanocomposite was synthesized through non-covalent imprinting process in the presence of IMQ, as template molecule and characterized by SEM and FT-IR. The square wave voltammetry technique (SWV) was applied for IMQ determination in 0.1 M phosphate buffer solution (PBS) at pH 7.0. Several parameters affecting the IMQ quantification were evaluated and optimized. Under the optimized conditions, the sensor presented a linear range of 0.02-20.0 μM, a limit of quantification and detection of 0.02 μM and 0.006 μM, respectively. Low RSD values indicate the good repeatability and reproducibility of the modified electrodes in preparation and determination procedures. The satisfactory results indicated that the proposed sensor could be successfully applied for IMQ determination in real samples.
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Affiliation(s)
- Moslem Afzali
- Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran; Young Researchers Society, Shahid Bahonar University of Kerman, Kerman, Iran.
| | - Ali Mostafavi
- Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Tayebeh Shamspur
- Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran
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26
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Ghanbari K, Roushani M, Soheyli E, Sahraei R. An electrochemical tyrosinamide aptasensor using a glassy carbon electrode modified by N-acetyl-l-cysteine-capped Ag-In-S QDs. Mater Sci Eng C Mater Biol Appl 2019; 102:653-660. [PMID: 31147037 DOI: 10.1016/j.msec.2019.04.093] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 04/25/2019] [Accepted: 04/29/2019] [Indexed: 02/06/2023]
Abstract
This paper reports an aptamer-based green approach for the electrochemical evaluation of tyrosinamide (Tyr-NH2). In this regard, at the first step, an aqueous synthetic strategy for preparing N-acetyl-l-cysteine (NAC)-capped Ag-In-S (AIS) quantum dots (QDs) with bright yellow/orange emission was developed. The conjugation of AIS QDs to NAC-biomolecules provides opportunities for using them as luminescent contrast agents for living cell tracking and labeling or sensing studies. In the next step, the design stage of the aptasensor, the glassy carbon electrode (GCE) was modified with the AIS QDs and then the Tyr-NH2 special aptamer, which has an amine group at its end, interacts with silver and indium ions at the surface of the AIS QDs and through the formation of covalent bonding of AgN and InN, attaches to the GCE surface modified with the AIS QDs. In this approach, for the first time, NAC-capped AIS QDs have been used to modify the electrode surface in the aptamer-based electrochemical sensor. The response changes of the [Fe(CN)6]4-/3- as redox probe, during the modification of GCE surface, the fabrication and assessment of proposed aptasensing, using the cyclic voltammetry, differential pulse voltammetry and electrochemical impedance spectroscopy were recorded. The designed aptasensor for the Tyr-NH2 evaluation showed good linearity from 0.01 to 2.81 nM and 2.81-10.81 nM, and low detection limit of 3.34 pM. The obtained results of the stability, reproducibility and selectivity investigations implying that the reported aptasensor as the first aptamer-based electrochemical assay for Tyr-NH2, can be reliable for the determination of Tyr-NH2 in serum samples.
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Affiliation(s)
- Kazhal Ghanbari
- Department of Chemistry, Faculty of Science, Ilam University, Ilam, Iran
| | - Mahmoud Roushani
- Department of Chemistry, Faculty of Science, Ilam University, Ilam, Iran.
| | - Ehsan Soheyli
- Department of Physics, Faculty of Science, Ilam University, 65315-516, Ilam, Iran
| | - Reza Sahraei
- Department of Chemistry, Faculty of Science, Ilam University, Ilam, Iran
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Ran P, Song J, Mo F, Wu J, Liu P, Fu Y. Nitrogen-doped graphene quantum dots coated with gold nanoparticles for electrochemiluminescent glucose detection using enzymatically generated hydrogen peroxide as a quencher. Mikrochim Acta 2019; 186:276. [PMID: 30969371 DOI: 10.1007/s00604-019-3397-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Accepted: 03/29/2019] [Indexed: 10/27/2022]
Abstract
Nitrogen-doped graphene quantum dots (N-GQDs) were prepared from dicyandiamide and then used as both an electrochemiluminescence (ECL) emitter and a reductant to produce gold nanoparticles (Au-N-GQDs) on their surface without using any reagent. In order to avoid resonance energy transfer, the Au-N-GQDs were stabilized with chitosan. Transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), UV-vis spectroscopy (UV-vis) and ECL methods were used to characterize the nanocomposite. The materials was placed on a glassy carbon electrode (GCE), and the ECL signals are found to be strongly quenched by hydrogen peroxide that is enzymatically produced by oxidation of glucose. With the applied typical potential of -1.7 V, the ECL of the Au-N-GQDs modified GCE decreases linearly in the 10 nM to 5.0 μM glucose concentration range, and the lower detection limit is 3.3 nM. The influence of H2O2 to the signal has been discussed and a possible mechanism has been presented. Graphical abstract Schematic presentation of the reduction of gold nanoparticles with nitrogen-droped graphene quantum dots (N-GQDs) to form Au-N-GQDs. They were used to detect glucose by electrochemiluminescence through a signal off strategy.
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28
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Ghalkhani M, Khaloo SS, Mirzaie RA. Klonopin assay using modified electrode with multiwalled carbon nanotubes and poly melamine nanocomposite. Mater Sci Eng C Mater Biol Appl 2019; 99:121-128. [PMID: 30889656 DOI: 10.1016/j.msec.2019.01.102] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 01/12/2019] [Accepted: 01/23/2019] [Indexed: 11/18/2022]
Abstract
Developing of cheap, sensitive and stable sensors plays a significant role in pharmaceutical and clinical applications. Considering the effective role of Klonopin (KNP) in the treatment of epilepsy, KNP quantification in its production process for dose adjustments and checking the purity and also after its usage by patents for bioavailability testing and effectiveness assay is vital. In present work, an efficient electrochemical sensor based on poly melamine and multiwalled carbon nanotubes nanocomposite (PMela/CNTs) was constructed which displayed effective electrochemical response toward KNP. Electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and square-wave voltammetry (SWV) experiments were applied for performance evaluation of the PMela/CNTs modified electrode and electrochemical redox behavior of KNP. Distinguish synergetic effect was observed between CNTs and poly melamine in response to KNP electrochemical redox reaction. A linear detection range of 0.05 to 10 μM with the detection limits of 63 nM was achieved for KNP analysis. The practical application of the PMela/CNTs modified electrode revealed satisfactory results for quantification of KNP in biological fluids.
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Affiliation(s)
- Masoumeh Ghalkhani
- Department of Chemistry, Faculty of Science, Shahid Rajaee Teacher Training University, Lavizan, P.O. Box 1678815811, Tehran, Iran.
| | - Shokooh Sadat Khaloo
- Department of Health, Safety and Environment, School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Rasol Abdullah Mirzaie
- Department of Chemistry, Faculty of Science, Shahid Rajaee Teacher Training University, Lavizan, P.O. Box 1678815811, Tehran, Iran
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29
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Ben Ali Hassine C, Barhoumi H. Electrochemical study of a glassy carbon electrode modified by poly-4-nitroaniline-reduced/murexide and its sensitivity for metal ions. Anal Biochem 2018; 560:30-38. [PMID: 30171830 DOI: 10.1016/j.ab.2018.08.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 08/22/2018] [Accepted: 08/25/2018] [Indexed: 10/28/2022]
Abstract
The electrochemical modification of a glassy carbon electrode using reduced poly-4 nitroaniline (P-4NA) and it's applicability for determination of metallic ions was performed in this study. The electrode modification was performed by cyclic voltammetry in the potential range between 0.9 V and 1.4 V vs Ag/Ag+ (in 10 mM AgNO3) at the scan rate of 100 mV/s by 50 cycles in non-aqueous media. The reduction of nitro groups on the P-4NA modified glassy carbon electrode surface was performed in the potential range between -0.1 V and -0.8 V vs Ag/AgCl(Sat. KCl) at a scan rate of 100 mV/s in 100 mM aqueous HCl solution. The reduced P-4NA glassy carbon surface was modified with the murexide. The affinity of the modified glassy carbon electrode with some metallic ions was investigated by electrochemical impedance spectroscopy method in phosphate buffer solution (pH = 5).
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Affiliation(s)
- C Ben Ali Hassine
- Laboratory of Interfaces and Advanced Materials (LIMA), FSM, Monastir 5000, Tunisia.
| | - H Barhoumi
- Laboratory of Interfaces and Advanced Materials (LIMA), FSM, Monastir 5000, Tunisia
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30
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Karim MR, Alam MM, Aijaz MO, Asiri AM, Dar MA, Rahman MM. Fabrication of 1,4-dioxane sensor based on microwave assisted PAni-SiO 2 nanocomposites. Talanta 2018; 193:64-69. [PMID: 30368299 DOI: 10.1016/j.talanta.2018.09.100] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2018] [Revised: 09/24/2018] [Accepted: 09/25/2018] [Indexed: 11/15/2022]
Abstract
In this study, conducting polyaniline (PAni) and silicon dioxide (SiO2) nanocomposites (NCs) were synthesized for chemical sensing applications by microwave assisted reaction technique. Facile synthesis and characterization of the PAni-SiO2 nanocomposites were investigated in details and discussed in this report. For the potential application, 1,4-dioxane chemical sensor was fabricated with the PAni-SiO2 nanocomposites deposited onto glassy carbon electrode (GCE). A very thin uniform film was deposited onto GCE with nanocomposite by using conducting 5% nafion binder at room conditions. To evaluate the sensor analytical performances, a calibration plot such as current versus concentration of 1,4-dioxane was drawn and calculated the analytical parameters from the slope of calibration curve. Results are found as sensitivity (0.5934 µAµmol-1 L-2 cm-2), detection limit (16.0 ± 0.8 pmol L-1), and quantification limit (LOQ; 53.3 ± 1.5 pmol L-1) in this observation. Considering the linear region in calibration plot, the linear dynamic range of 1,4-dioxane chemical sensor was found (0.12 nmol L-1 ∼ 1.2 mmol L-1). Besides this, the proposed 1,4-dioxane chemical sensor was exhibited good reproducibility, long-term stability, high accuracy in detecting of 1,4-dioxane in real environmental samples. This research is to develop of a selective and an efficient electrochemical sensor. It might be a simple and easy way by applying electrochemical method to ensure the safe and sustainable green environment.
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Affiliation(s)
- Mohammad R Karim
- Center of Excellence for Research in Engineering Materials (CEREM), King Saud University, Riyadh 11421, Saudi Arabia.
| | - M M Alam
- Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhet 3100, Bangladesh
| | - M O Aijaz
- Center of Excellence for Research in Engineering Materials (CEREM), King Saud University, Riyadh 11421, Saudi Arabia
| | - Abdullah M Asiri
- Center of Excellence for Advanced Materials Research & Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - M A Dar
- Center of Excellence for Research in Engineering Materials (CEREM), King Saud University, Riyadh 11421, Saudi Arabia
| | - Mohammed M Rahman
- Center of Excellence for Advanced Materials Research & Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
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31
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Cao HX, Wang L, Pan CG, He YS, Liang GX. Aptamer based electrochemiluminescent determination of bisphenol A by using carboxylated graphitic carbon nitride. Mikrochim Acta 2018; 185:463. [PMID: 30225568 DOI: 10.1007/s00604-018-2997-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 09/08/2018] [Indexed: 12/14/2022]
Abstract
An electrochemiluminescence (ECL) based assay is described for the determination of the endocrine disruptor bisphenol A (BPA). The method is based on the use of carboxylated graphitic carbon nitride (C-g-C3N4) carrying an immobilized aptamer against BPA. In the presence of BPA, the ECL signal decreases due to ECL energy transfer from excited-state C-g-C3N4 to the BPA oxidation product. Under the optimal conditions, ECL intensity increases linearly in the 0.1 pM to 1 nM BPA concentration range. The detection limit is as low as 30 fM. The assay has excellent sensitivity, outstanding stability and high selectivity. It was applied to the determination of BPA in spiked water samples. Graphical abstract Aptamer modified carboxylated graphitic carbon nitride was synthesized and applied in an electrochemiluminescence-based aptasensor for bisphenol A.
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Affiliation(s)
- Hai-Xia Cao
- School of Pharmacy, Jiangsu University, Zhenjiang, 212013, China
| | - Li Wang
- School of Pharmacy, Jiangsu University, Zhenjiang, 212013, China.
| | - Chang-Gang Pan
- School of the Environment, Jiangsu University, Zhenjiang, 212013, China
| | - Yu-Sheng He
- School of the Environment, Jiangsu University, Zhenjiang, 212013, China
| | - Guo-Xi Liang
- School of the Environment, Jiangsu University, Zhenjiang, 212013, China.
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32
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Khonsari YN, Sun S. Electrochemiluminescent aptasensor for thrombin using nitrogen-doped graphene quantum dots. Mikrochim Acta 2018; 185:430. [PMID: 30143874 DOI: 10.1007/s00604-018-2942-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 08/02/2018] [Indexed: 10/28/2022]
Abstract
An electrochemiluminescent (ECL) aptamer based method is described for the determination of thrombin. Three-dimensional nitrogen-doped graphene oxide (3D-NGO) was placed on a glassy carbon electrode (GCE) to provide an electrode surface that displays excellent electrical conductivity and acts as a strong emitter of ECL. The modified electrode was further coated with chitosan via electrodeposition. Finally, the amino-modified aptamer was immobilized on the modified GCE. The interaction between thrombin and aptamer results in a decrease in ECL. The assay has a linear response in the 1 fM to 1 nM thrombin concentration range and a 0.25 fM lower detection limit (at an S/N ratio of 3). The method was applied to the determination of thrombin in spiked human plasma samples, and recoveries ranged between 94 and 105% (with RSDs of <3.6%). The calibration plot was recorded at potential and wavelength of fluorescence emission (wavelength: 445 nm; potential: 0 to -2 V). Graphical abstract A bare glassy carbon electrode (GCE) does not display electrochemiluminescence (ECL). If, however, nitrogen-doped graphene quantum dots, chitosan, and three-dimensional nitrogen-doped graphene oxide (NGQD-chitosan/3D-NGO) are electrodeposited on the GCE, strong ECL can be observed. The ECL intensity decreased after aptamer and bovine serum albumin (BSA) were dropped onto the electrode (curve a). However, the ECL further decreases after addition of thrombin (TB; curve b).
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Berto S, Carena L, Chiavazza E, Marletti M, Fin A, Giacomino A, Malandrino M, Barolo C, Prenesti E, Vione D. Off-line and real-time monitoring of acetaminophen photodegradation by an electrochemical sensor. Chemosphere 2018; 204:556-562. [PMID: 29602587 DOI: 10.1016/j.chemosphere.2018.03.069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 03/09/2018] [Accepted: 03/10/2018] [Indexed: 06/08/2023]
Abstract
The photochemistry of N-acetyl-para-aminophenol (acetaminophen, APAP) is here investigated by using differential pulse voltammetry (DPV) analysis to monitor APAP photodegradation upon steady-state irradiation. The purpose of this work is to assess the applicability of DPV to monitor the photochemical behaviour of xenobiotics, along with the development of an electrochemical set-up for the real-time monitoring of APAP photodegradation. We here investigated the APAP photoreactivity towards the main photogenerated reactive transients species occurring in sunlit surface waters (hydroxyl radical HO, carbonate radical CO3-, excited triplet state of anthraquinone-2-sulfonate used as proxy of the chromophoric DOM, and singlet oxygen 1O2), and determined relevant kinetic parameters. A standard procedure based on UV detection coupled with liquid chromatography (HPLC-UV) was used under identical experimental conditions to compare and verify the DPV-based results. The latter were in agreement with HPLC data, with the exception of the triplet-sensitized processes. In the other cases, DPV could be used as an alternative to the well-tested but more costly and time-consuming HPLC-UV technique. We have also assessed the reaction rate constant between APAP and HO by real-time DPV, which allowed for the monitoring of APAP photodegradation inside the irradiation chamber. Unfortunately, real-time DPV measurements are likely to be affected by temperature variations of the irradiated samples. Overall, DPV appeared as a fast, cheap and reasonably reliable technique when used for the off-line monitoring of APAP photodegradation. When a suitable real-time procedure is developed, it could become a very straightforward method to study the photochemical behaviour of electroactive xenobiotics.
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Affiliation(s)
- Silvia Berto
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy.
| | - Luca Carena
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy.
| | - Enrico Chiavazza
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy
| | - Matteo Marletti
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy
| | - Andrea Fin
- Dept. of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, United States
| | - Agnese Giacomino
- Dept. of Drug Science and Technology, University of Torino, Via P. Giuria 9, 10125 Turin, Italy
| | - Mery Malandrino
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy
| | - Claudia Barolo
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy; INSTM and NIS Centre, University of Torino, Via Quarello 15A, 10135 Turin, Italy
| | - Enrico Prenesti
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy
| | - Davide Vione
- Dept. of Chemistry, University of Torino, Via P. Giuria 7, 10125 Turin, Italy
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Parsaee Z. Synthesis of novel amperometric urea-sensor using hybrid synthesized NiO-NPs/GO modified GCE in aqueous solution of cetrimonium bromide. Ultrason Sonochem 2018; 44:120-128. [PMID: 29680593 DOI: 10.1016/j.ultsonch.2018.02.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 01/17/2018] [Accepted: 02/10/2018] [Indexed: 06/08/2023]
Abstract
In this study NiO nanostructures were synthesized via combinational synthetic method (ultrasound-assisted biosynthesis) and immobilized on the glassy carbon electrode (GCE) as a highly sensitive and selective enzyme-less sensor for urea detection. NiO-NPs were fully characterized using SEM, EDX, XRD, BET, TGA, FT-IR, UV-vis and Raman methods which revealed the formation of NiO nanostructures in the form of cotton like porous material and crystalline in nature with the average size of 3.8 nm. GCE was modified with NiO-NPs in aqueous solution of cetrimonium bromide(CTAB). Highly adhesive NiO/CTAB/GO nanocomposite membrane has been formed on GCE by immersing NiO/CTAB modified GCE in GO suspension. CTAB has a major role in the production and immobilization of the nanocomposites on the GCE surface and the binding NiO nanoparticles on GO plates. In addition, CTAB/GO composition made a highly adhesive surface on the GCE. The resulting NiO/CTAB/GO/GCE contains potently sensitive to urea in aqueous environments. The response of as developed amperometric sensor was linear in the range of 100-1200 µM urea with R2 value of 0.991 and limit of detection (LOD), 8 µM. The sensor responded negligibly to various interfering species like glucose, uric acid and ascorbic acid. This sensor was applied successfully for determining urea in real water samples such as mineral water, tap water and river water with acceptable recovery.
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Affiliation(s)
- Zohreh Parsaee
- Young Researchers and Elite Club, Bushehr Branch, Islamic Azad University, Bushehr, Iran.
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35
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Wang Y, Zhai F, Hasebe Y, Jia H, Zhang Z. A highly sensitive electrochemical biosensor for phenol derivatives using a graphene oxide-modified tyrosinase electrode. Bioelectrochemistry 2018; 122:174-82. [PMID: 29656242 DOI: 10.1016/j.bioelechem.2018.04.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 04/04/2018] [Accepted: 04/06/2018] [Indexed: 12/22/2022]
Abstract
The fabrication, characterization and analytical performance were investigated for a phenol biosensor based on the covalent bonding of tyrosinase (TYR) onto a graphene oxide (GO)-modified glassy carbon electrode (GCE) via glutaraldehyde (GA). The surface morphology of the modified electrode was studied by atomic force microscope (AFM) and field-emission scanning electron microscopy (FE-SEM). The fabricated TYR/GA/GO/GCE biosensor showed very good stability, reproducibility, sensitivity and practical usage. The catechol biosensor exhibited a wide sensing linear range from 5×10-8M to 5×10-5M, a lower detection limit of 3×10-8M, a current maximum (Imax) of 65.8μA and an apparent Michaelis constant (Kmapp) of 169.9μM.
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Song J, Yang C, Ma J, Han Q, Ran P, Fu Y. Voltammetric chiral discrimination of tryptophan using a multilayer nanocomposite with implemented amino-modified β-cyclodextrin as recognition element. Mikrochim Acta 2018; 185:230. [PMID: 29594758 DOI: 10.1007/s00604-018-2765-y] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 03/10/2018] [Indexed: 11/24/2022]
Abstract
An electrochemical chiral multilayer nanocomposite was prepared by modifying a glassy carbon electrode (GCE) via opposite-charge adsorption of amino-modified β-cyclodextrin (NH2-β-CD), gold-platinum core-shell microspheres (Au@Pts), polyethyleneimine (PEI), and multi-walled carbon nanotubes (MWCNTs). The modified GCE was applied to the enantioselective voltammetric determination of tryprophan (Trp). The Au@Pts enable an effective immobilization of the chiral selector (NH2-β-CD) and enhance the electrochemical performance. Scanning electron microscopy, transmission electron microscopy, UV-vis spectroscopy, FTIR and electrochemical methods were used to characterize the nanocomposite. Trp enantiomers were then determined by differential pulse voltammetry (DPV) (with a peak potential of +0.7 V vs. Ag/AgCl). The recognition efficiency was expressed by an increase in peak height by about 32% for DPV determinations of L-Trp compared to D-Trp in case of a 5 mM Trp solution of pH 7.0. Response was linear in the 10 μM to 5.0 mM concentration range, and the limits of detection were 4.3 μM and 5.6 μM with electrochemical sensitivity of 43.5 μA·μM-1·cm-2 and 34.6 μA·μM-1·cm-2 for L-Trp and D-Trp, respectively (at S/N = 3). Graphical Abstract Schematic of an electrochemical chiral multilayer nanocomposite composed of multi-walled carbon nanotubes (MWCNTs), polyethyleneimine (PEI), gold-platinum core-shell microspheres (Au@Pt) and amino-modified β-cyclodextrin (NH2-β-CD). It was prepared by modifying a glassy carbon electrode (GCE) for enantioselective voltammetric determination of tryptophan (Trp) enantiomers.
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Affiliation(s)
- Jinyi Song
- Key Laboratory of Luminescence and Real-Time Analysis (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Chengcheng Yang
- Key Laboratory of Luminescence and Real-Time Analysis (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Jiao Ma
- Key Laboratory of Luminescence and Real-Time Analysis (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Qian Han
- Key Laboratory of Luminescence and Real-Time Analysis (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Peiyao Ran
- Key Laboratory of Luminescence and Real-Time Analysis (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Yingzi Fu
- Key Laboratory of Luminescence and Real-Time Analysis (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
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Wang J, Ma K, Yin H, Zhou Y, Ai S. Aptamer based voltammetric determination of ampicillin using a single-stranded DNA binding protein and DNA functionalized gold nanoparticles. Mikrochim Acta 2017; 185:68. [PMID: 29594557 DOI: 10.1007/s00604-017-2566-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 11/09/2017] [Indexed: 12/31/2022]
Abstract
An aptamer based method is described for the electrochemical determination of ampicillin. It is based on the use of DNA aptamer, DNA functionalized gold nanoparticles (DNA-AuNPs), and single-stranded DNA binding protein (ssDNA-BP). When the aptamer hybridizes with the target DNA on the AuNPs, the ssDNA-BP is captured on the electrode surface via its specific interaction with ss-DNA. This results in a decreased electrochemical signal of the redox probe Fe(CN)63- which is measured best at a voltage of 0.188 mV (vs. reference electrode). In the presence of ampicillin, the formation of aptamer-ampicillin conjugate blocks the further immobilization of DNA-AuNPs and ssDNA-BP, and this leads to an increased response. The method has a linear reposne that convers the 1 pM to 5 nM ampicillin concentration range, with a 0.38 pM detection limit (at an S/N ratio of 3). The assay is selective, stable and reproducible. It was applied to the determination of ampicillin in spiked milk samples where it gave recoveries ranging from 95.5 to 105.5%. Graphical abstract Schematic of a simple and sensitive electrochemical apta-biosensor for ampicillin detection. It is based on the use of gold nanoparticles (AuNPs), DNA aptamer, DNA functionalized AuNPs (DNA-AuNPs), and single-strand DNA binding protein (SSBP).
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Affiliation(s)
- Jun Wang
- College of Resources and Environment, Key Laboratory of Agricultural Environment in Universities of Shandong, Shandong Agricultural University, Taian, 271018, People's Republic of China
| | - Kui Ma
- College of Chemistry and Material Science, Shandong Agricultural University, 271018, Taian, Shandong, People's Republic of China
| | - Huanshun Yin
- College of Chemistry and Material Science, Shandong Agricultural University, 271018, Taian, Shandong, People's Republic of China
| | - Yunlei Zhou
- College of Chemistry and Material Science, Shandong Agricultural University, 271018, Taian, Shandong, People's Republic of China.
| | - Shiyun Ai
- College of Chemistry and Material Science, Shandong Agricultural University, 271018, Taian, Shandong, People's Republic of China
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Rahman MM, Ahmed J. Cd-doped Sb 2O 4 nanostructures modified glassy carbon electrode for efficient detection of melamine by electrochemical approach. Biosens Bioelectron 2017; 102:631-636. [PMID: 29248717 DOI: 10.1016/j.bios.2017.12.007] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 11/25/2017] [Accepted: 12/05/2017] [Indexed: 11/24/2022]
Abstract
Cadmium doped antimony oxide (Cd-doped Sb2O4) nanostructures (CAO-NSs) were synthesized by a facile hydrothermal method in alkaline phase at low temperature to detect the melamine from aqueous solution. The calcined CAO-NSs were characterized systematically by FE-SEM, EDS, UV/Vis., FTIR spectroscopy, powder XRD, and XPS techniques. The glassy carbon electrode (GCE) was modified with the CAO-NSs and sensing performance towards the selective melamine was explored by the electrochemical approach in phosphate buffer solution. The melamine undergoes a reduction reaction in the presence of CAO-NSs/GCE in PBS. The CAO-NSs/GCE attained the higher sensitivity (3.153μAμM-1cm-2) for a wide ranges of concentration (LDR: 0.05nM-0.5mM), an ultra-low limit of detection (LOD: 14.0 ± 0.05p.M.; S/N = 3), long-term stability, excellent repeatability, and reproducibility. This method might represent an efficient way of sensitive sensor development for the toxic melamine and their derivatives for the safety of biomedical and health care fields in broad scales.
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Affiliation(s)
- Mohammed M Rahman
- Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
| | - Jahir Ahmed
- Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet 3100, Bangladesh
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Ferraz BRL, Guimarães T, Profeti D, Profeti LPR. Electrooxidation of sulfanilamide and its voltammetric determination in pharmaceutical formulation, human urine and serum on glassy carbon electrode. J Pharm Anal 2018; 8:55-9. [PMID: 29568668 DOI: 10.1016/j.jpha.2017.10.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 10/25/2017] [Accepted: 10/30/2017] [Indexed: 11/22/2022] Open
Abstract
For the first time, sulfanilamide (SFD) was determined in otologic solution, human urine and serum by electroanalytical techniques on glassy carbon electrode (GCE). The cyclic voltammetry (CV) experiments showed an irreversible oxidation peak at +1.06 V in 0.1 mol/L BRBS (pH = 2.0) at 50 mV/s. Different voltammetric scan rates (from 10 to 250 mV/s) suggested that the oxidation of SFD on the GCE was a diffusion-controlled process. Square-wave voltammetry (SWV) method under optimized conditions showed a linear response to SFD from 5.0 to 74.7 μmol/L (R = 0.999) with detection and quantification limits of 0.92 and 3.10 μmol/L, respectively. The developed SWV method showed better results for detection limit and linear range than the chronoamperometry method. It has been successfully applied to determine SFD concentration in pharmaceutical formulation, human urine and serum samples with recovery close to 100%.
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Rahman MM, Alam MM, Asiri AM, Islam MA. 3,4-Diaminotoluene sensor development based on hydrothermally prepared MnCo xO y nanoparticles. Talanta 2017; 176:17-25. [PMID: 28917737 DOI: 10.1016/j.talanta.2017.07.093] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 07/29/2017] [Accepted: 07/31/2017] [Indexed: 10/19/2022]
Abstract
A facile hydrothermal process was used to prepare MnCoxOy nanoparticles (NPs) in alkaline medium (pH~10.5) at room temperature. The NPs were characterized by Fourier-transform infrared spectroscopy (FTIR), ultraviolet visible spectroscopy (UV/vis), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), and powder X-ray diffraction (XRD). A thin layer of NPs film as a chemical sensor was fabricated on a glassy carbon electrode (GCE) with the help of a conducting binder. The sensor was implemented successfully for the detection 3,4-DAT with reliable I-V approach at low potential. The sensor-features include good sensitivity (0.37 mAµmolL-1cm-2), low detection limit (LOD=0.26±0.01 pmolL-1 at a signal to noise ratio of 3), low limit of quantification (LOQ=7.80±0.01 pmolL-1), good reliability, good reproducibility, ease of integration, and long-term stability were investigated. The sensor response towards 3,4-DAT is linear in logarithmic scale over a large concentration range (1.0 pmolL-1 to 1.0 µmolL-1). This work is introduced a route for future sensitive sensor development based on MnCoxOy NPs by reliable I-V method for the detection of hazardous and carcinogenic toxins in environmental and health care fields.
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Affiliation(s)
- Mohammed M Rahman
- Chemistry Department, King Abdulaziz University, Faculty of Science, Jeddah 21589, P.O. Box 80203, Saudi Arabia; Center of Excellence for Advanced Material Research (CEAMR), King Abdulaziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia.
| | - M M Alam
- Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhet 3100, Bangladesh
| | - Abdullah M Asiri
- Chemistry Department, King Abdulaziz University, Faculty of Science, Jeddah 21589, P.O. Box 80203, Saudi Arabia; Center of Excellence for Advanced Material Research (CEAMR), King Abdulaziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia
| | - M A Islam
- Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhet 3100, Bangladesh
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Enache TA, Oliveira-Brett AM. Alzheimer's disease amyloid beta peptides in vitro electrochemical oxidation. Bioelectrochemistry 2016; 114:13-23. [PMID: 27855361 DOI: 10.1016/j.bioelechem.2016.11.003] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 11/02/2016] [Accepted: 11/03/2016] [Indexed: 12/29/2022]
Abstract
The oxidative behaviour of the human amyloid beta (Aβ1-40 and Aβ1-42) peptides and a group of similar peptides: control inverse (Aβ40-1 and Aβ42-1), mutants (Aβ1-40Phe10 and Aβ1-40Nle35), rat Aβ1-40Rat, and fragments (Aβ1-28, Aβ1-16, Aβ10-20, Aβ12-28, and Aβ17-42), in solution or adsorbed, at a glassy carbon electrode, by cyclic and differential pulse voltammetry, were investigated and compared. Structurally the Aβ1-40 and Aβ1-42 sequences contain five electroactive amino acid residues, one tyrosine (Tyr10), three histidines (His6, His13 and His14) and one methionine (Met35). The Aβ peptide 3D structure influenced the exposure of the redox residues to the electrode surface and their oxidation peak currents. Depending on the amino acid sequence length and content, the Aβ peptides gave one or two oxidation peaks. The first electron transfer reaction corresponded to the tyrosine amino acid residue oxidation, and the second to both histidines and methionine amino acid residues. The highest contribution to the second oxidation peak current was from His13, followed by His14 and His6 residues, and Met35 residue had the lowest contribution. The Aβ peptides electron transfer depended on peptide hydrophobicity and 3D structure, the redox residues position in the sequence, the redox residues close to N-termini giving the highest oxidation peak currents.
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Affiliation(s)
- Teodor Adrian Enache
- Department of Chemistry, Faculty of Sciences and Technology, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Ana Maria Oliveira-Brett
- Department of Chemistry, Faculty of Sciences and Technology, University of Coimbra, 3004-535 Coimbra, Portugal.
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Fernandes IP, Oliveira-Brett AM. Calcium-induced calmodulin conformational change. Electrochemical evaluation. Bioelectrochemistry 2017; 113:69-78. [PMID: 27768936 DOI: 10.1016/j.bioelechem.2016.10.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 09/27/2016] [Accepted: 10/04/2016] [Indexed: 01/08/2023]
Abstract
Calmodulin (CaM) is an essential protein present in all eukaryote cells, ranging from vertebrates to unicellular organisms. CaM is the most important Ca2+ signalling protein, composed of two domains, N- and C-terminal domains, linked by a flexible central α-helix, and is responsible for the regulation of numerous calcium-mediated signalling pathways. Four calcium ions bind to CaM, changing its conformation and determining how it recognizes and regulates its cellular targets. The oxidation mechanism of native and denatured CaM, at a glassy carbon electrode, was investigated using differential pulse voltammetry and electrochemical impedance spectroscopy. Native and denatured CaM presented only one oxidation peak, related to the tyrosine amino acid residue oxidation. Calcium-induced calmodulin conformational change and the influence of Ca2+ concentration on the electrochemical behaviour of CaM were evaluated, and significant differences, in the tyrosine amino acid residue peak potential and current, in the absence and in the presence of calcium ions, were observed. Gravimetric measurements were performed with a graphite coated piezoelectric quartz crystal with adsorbed CaM, and calcium aggregation by CaM was demonstrated.
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Jakubowska M, Sordoń W, Ciepiela F. Unsupervised pattern recognition methods in ciders profiling based on GCE voltammetric signals. Food Chem 2016; 203:476-82. [PMID: 26948640 DOI: 10.1016/j.foodchem.2016.02.112] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 02/09/2016] [Accepted: 02/16/2016] [Indexed: 11/20/2022]
Abstract
This work presents a complete methodology of distinguishing between different brands of cider and ageing degrees, based on voltammetric signals, utilizing dedicated data preprocessing procedures and unsupervised multivariate analysis. It was demonstrated that voltammograms recorded on glassy carbon electrode in Britton-Robinson buffer at pH 2 are reproducible for each brand. By application of clustering algorithms and principal component analysis visible homogenous clusters were obtained. Advanced signal processing strategy which included automatic baseline correction, interval scaling and continuous wavelet transform with dedicated mother wavelet, was a key step in the correct recognition of the objects. The results show that voltammetry combined with optimized univariate and multivariate data processing is a sufficient tool to distinguish between ciders from various brands and to evaluate their freshness.
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Mehmeti E, Stanković DM, Hajrizi A, Kalcher K. The use of graphene nanoribbons as efficient electrochemical sensing material for nitrite determination. Talanta 2016; 159:34-39. [PMID: 27474276 DOI: 10.1016/j.talanta.2016.05.079] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 05/26/2016] [Accepted: 05/31/2016] [Indexed: 01/08/2023]
Abstract
In this work new designed, highly sensitive electrochemical method is developed for the determination of nitrites in tap water using glassy carbon electrode modified with graphene nanoribbons (GNs/GCE). Graphene nanoribbons (GNs) have been newly synthetized and aligned to the surface of glassy carbon electrode (GCE) and exhibited excellent electrocatalytic activity for nitrite oxidation with a very high peak currents. Studies about electrochemical behavior and optimization of the most important experimental conditions were done using cyclic voltammetry (CV), while quantitative studies were done with amperometric detection. Nitrite provides a well-defined, oxidation peak at +0.9V (vs. Ag/AgCl, 3.0M KCl) in Britton-Robinson buffer solution (BRBS) at pH 3. The influence of most possible interferent ions has been examined and was found to be negligible. Under optimized experimental conditions in BRBS at pH 3 linear calibration curves were obtained in the range from 0.5 to 105µM with the detection limit of 0.22µM. Reproducibility of ten replicate measurements of 1µM of nitrite was estimated to be 1.9%. Proposed method and constructed sensor is successfully applied for the determination of nitrite present in tap water samples without any pretreatment. This developed method represents inexpensive analytical alternative approach compared to other analytical methods.
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Affiliation(s)
- Eda Mehmeti
- Institute of Chemistry - Analytical Chemistry, Karl-Franzens University, Universitätsplatz 1, Graz A-8010, Austria.
| | - Dalibor M Stanković
- Department of Analytical Chemistry, Innovation Center of the Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade 11000, Serbia
| | - Ahmet Hajrizi
- Institute of Chemistry - Analytical Chemistry, Karl-Franzens University, Universitätsplatz 1, Graz A-8010, Austria
| | - Kurt Kalcher
- Institute of Chemistry - Analytical Chemistry, Karl-Franzens University, Universitätsplatz 1, Graz A-8010, Austria.
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Bekir K, Bousimma F, Barhoumi H, Fedhila K, Maaref A, Bakhrouf A, Ben Ouada H, Namour P, Jaffrezic-Renault N, Ben Mansour H. An investigation of the well-water quality: immunosensor for pathogenic Pseudomonas aeruginosa detection based on antibody-modified poly(pyrrole-3 carboxylic acid) screen-printed carbon electrode. Environ Sci Pollut Res Int 2015; 22:18669-18675. [PMID: 26178830 DOI: 10.1007/s11356-015-5004-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 06/30/2015] [Indexed: 06/04/2023]
Abstract
In this report, we describe a new immunosensor designed for the detection and the quantification of Pseudomonas aeruginosa bacteria in water. The developed biosensing system was based on the immobilization of purified polyclonal anti P. aeruginosa antibodies on electropolymerized poly(pyrrole-3-carboxylic acid)/glassy carbon electrode. The building of the immunosensor step by step was evaluated by electrochemical measurements such as cyclic voltammetry (CV) and impedance spectroscopy (EIS). The electrochemical signature of the immunosensor was established by the change of the charge transfer resistance when the bacteria suspended in solution became attached to the immobilized antibodies. As a result, stable and high sensitive impedimetric immunosensor was obtained with a sensitivity of 0.19 kΩ/decade defined in the linear range from 10(1) to 10(7) CFU/mL of cellular concentrations. A low detection limit was obtained for the P. aeruginosa bacteria and a high selectivity when other bacteria were occasioned as well as Escherichia coli. The developed immunosensor was applied in detecting pathogenic P. aeruginosa in well-water.
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Affiliation(s)
- Karima Bekir
- Laboratory of Analysis, Treatment and Valorisation of Pollutants of Environment and of Products, Faculty of Pharmacy, University of Monastir, 5019, Monastir, Tunisia
| | - Feriel Bousimma
- Laboratory of Interfaces and Advanced Materials, Faculty of Sciences, University of Monastir, Monastir, Tunisia
| | - Houcine Barhoumi
- Laboratory of Interfaces and Advanced Materials, Faculty of Sciences, University of Monastir, Monastir, Tunisia
| | - Kais Fedhila
- Laboratory of Analysis, Treatment and Valorisation of Pollutants of Environment and of Products, Faculty of Pharmacy, University of Monastir, 5019, Monastir, Tunisia
| | - Abderrazak Maaref
- Laboratory of Interfaces and Advanced Materials, Faculty of Sciences, University of Monastir, Monastir, Tunisia
| | - Amina Bakhrouf
- Laboratory of Analysis, Treatment and Valorisation of Pollutants of Environment and of Products, Faculty of Pharmacy, University of Monastir, 5019, Monastir, Tunisia
| | - Hafedh Ben Ouada
- Higher Institute of Applied Sciences and Technology of Mahdia, Monastir University, Monastir, Tunisia
| | - Philippe Namour
- Laboratory of Analytical Sciences, Doua, 69100, Villeurbanne, Lyon, France
| | | | - Hedi Ben Mansour
- Higher Institute of Applied Sciences and Technology of Mahdia, Monastir University, Monastir, Tunisia.
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Natale A, Nardiello D, Palermo C, Muscarella M, Quinto M, Centonze D. Development of an analytical method for the determination of polyphenolic compounds in vegetable origin samples by liquid chromatography and pulsed amperometric detection at a glassy carbon electrode. J Chromatogr A 2015; 1420:66-73. [PMID: 26456515 DOI: 10.1016/j.chroma.2015.09.082] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 09/23/2015] [Accepted: 09/28/2015] [Indexed: 01/17/2023]
Abstract
A sensitive and accurate method for the determination of polyphenolic compounds in artichoke bract extracts and olive mill wastewaters by liquid chromatography coupled with pulsed amperometric detection at a glassy carbon working electrode was developed. Preliminary experiments were carried out by cyclic voltammetry to investigate the electrochemical behavior of polyphenols under different mobile phase compositions, and to test the detection and cleaning electrode potentials. Chromatographic separations were performed by using a core-shell C18 column, eluted with acetic acid and acetonitrile, by combined concave-linear binary gradients. Under the optimized experimental conditions, a good column efficiency and peak symmetry were observed, also for stereo and positional isomeric compounds. The developed three-step potential waveform for pulsed amperometric detection was successfully applied for the sensitive chromatographic determination of polyphenols in artichoke extracts and olive mill wastewaters. Linearity, precision and sensitivity of the proposed method have been evaluated. A wide linear range of response (up to 20 mg/L) has been obtained for all the investigated compounds. Detection and quantification limits in the vegetable origin sample extracts were in the range 0.004-0.6 mg/L and 0.01-2mg/L, respectively, while the injection-to-injection repeatability (n=6) ranged from 5 to 13%. The obtained results confirmed the excellent sensitivity of the electrochemical detection, and its suitability for the determination of electroactive polyphenolic compounds at low concentration levels.
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Affiliation(s)
- Anna Natale
- Dipartimento di Scienze Agrarie, degli Alimenti e dell'Ambiente and CSRA - Centro Servizi di Ricerca Applicata, Università degli Studi di Foggia, Via Napoli, 25, 71100 Foggia, Italy
| | - Donatella Nardiello
- Dipartimento di Scienze Agrarie, degli Alimenti e dell'Ambiente and CSRA - Centro Servizi di Ricerca Applicata, Università degli Studi di Foggia, Via Napoli, 25, 71100 Foggia, Italy.
| | - Carmen Palermo
- Dipartimento di Scienze Agrarie, degli Alimenti e dell'Ambiente and CSRA - Centro Servizi di Ricerca Applicata, Università degli Studi di Foggia, Via Napoli, 25, 71100 Foggia, Italy
| | - Marilena Muscarella
- Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia, 20, 71100 Foggia, Italy
| | - Maurizio Quinto
- Dipartimento di Scienze Agrarie, degli Alimenti e dell'Ambiente and CSRA - Centro Servizi di Ricerca Applicata, Università degli Studi di Foggia, Via Napoli, 25, 71100 Foggia, Italy
| | - Diego Centonze
- Dipartimento di Scienze Agrarie, degli Alimenti e dell'Ambiente and CSRA - Centro Servizi di Ricerca Applicata, Università degli Studi di Foggia, Via Napoli, 25, 71100 Foggia, Italy
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Górski Ł, Sordoń W, Ciepiela F, Kubiak WW, Jakubowska M. Voltammetric classification of ciders with PLS-DA. Talanta 2015; 146:231-6. [PMID: 26695257 DOI: 10.1016/j.talanta.2015.08.027] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 08/10/2015] [Accepted: 08/14/2015] [Indexed: 11/29/2022]
Abstract
Voltammograms recorded on the glassy carbon electrode (GCE) may be a chemical fingerprints of food samples, enabled distinguishing the origin of the considered products. In this work the objects of the study was 5 Polish ciders of various brands. For each sample 10 scans were recorded by DPV in the potential range between -0.2 and 1.0 V in Britton-Robinson buffer at pH 2.0. The signals preprocessing realized by baseline correction with 4-th degree polynomial and normalization (in 0 to 1 interval), performed to reduce problems with insufficient signal's repeatability associated with mechanical renovation of the electrode surface before each measurement. The PLS-DA classification models were built using the training set and then validated using the samples absent in the learning process. The final multi-class model with optimized complexity enables classification of the ciders with 100% sensitivity and specificity, with the exception of one cider, where specificity was 95% (for validation set).
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Affiliation(s)
- Łukasz Górski
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
| | - Wanda Sordoń
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
| | - Filip Ciepiela
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
| | - Władysław W Kubiak
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
| | - Małgorzata Jakubowska
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland.
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48
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Li BL, Luo JH, Luo HQ, Li NB. A novel conducting poly(p-aminobenzene sulphonic acid)-based electrochemical sensor for sensitive determination of Sudan I and its application for detection in food stuffs. Food Chem 2015; 173:594-9. [PMID: 25466064 DOI: 10.1016/j.foodchem.2014.10.060] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Revised: 09/18/2014] [Accepted: 10/10/2014] [Indexed: 11/23/2022]
Abstract
In the present work, a new method for the determination of Sudan I has been developed based on a conducting poly(p-aminobenzene sulphonic acid) (poly(p-ABSA)) film modified electrode. The new electrochemical sensor showed strong accumulation ability and excellent electrocatalytic activity for Sudan I. Electrochemical oxidation signal of Sudan I at the poly(p-ABSA) modified glassy carbon electrode (poly(p-ABSA)/GCE) was significantly increased when compared to that at the bare GCE. The experimental conditions such as amount of alcohol, pH of buffer solution, accumulation time, and instrumental parameters for square wave anodic stripping voltammetry were optimised for the determination of Sudan I. Under optimum conditions, the linear regression equation of Sudan I was ip=1.868+0.1213c (ip: μA, c: μgL(-1), R=0.9981) from 1 to 500 μg L(-1) with a detection limit of 0.3 μg L(-1). Finally, this sensor was successfully employed to detect Sudan I in some hot chili and ketchup samples.
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49
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Pontinha ADR, Lombardo CM, Neidle S, Oliveira-Brett AM. Triazole-linked phenyl derivatives: redox mechanisms and in situ electrochemical evaluation of interaction with dsDNA. Bioelectrochemistry 2014; 101:97-105. [PMID: 25194950 DOI: 10.1016/j.bioelechem.2014.08.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 07/08/2014] [Accepted: 08/13/2014] [Indexed: 11/28/2022]
Abstract
The redox mechanism of two trisubstituted triazole-linked phenyl derivatives (CL41 and CL42) and a disubstituted triazole-linked phenyl derivative (CL2r50) were studied using cyclic, differential pulse and square wave voltammetry at a glassy carbon electrode. The CL41, CL42 and CL2r50 oxidation is a complex, pH-dependent irreversible process involving the formation of electroactive products that undergo two consecutive reversible oxidation reactions. The DNA interaction with CL41, CL42 and CL2r50 was investigated by differential pulse voltammetry using the dsDNA-electrochemical biosensor and in DNA/trisubstituted triazole incubated solutions. All three trisubstituted triazole-linked phenyl derivatives interacted with dsDNA causing morphological and oxidative damage to the dsDNA structure in a time-dependent manner. The DNA-electrochemical biosensor enabled the detection of oxidative damage to DNA following the occurrence of the 8-oxoGua and/or 2,8-oxoAde oxidation peaks.
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Affiliation(s)
- A Dora R Pontinha
- Department of Chemistry, University of Coimbra, Coimbra 3004-535, Portugal
| | | | - Stephen Neidle
- UCL School of Pharmacy, University College London, London WC1N 1AX, UK
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50
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Jain R, Kumar Yadav R, Ahmad Rather J. Voltammetric quantitation of nitazoxanide by glassy carbon electrode. J Pharm Anal 2013; 3:452-5. [PMID: 29403854 DOI: 10.1016/j.jpha.2013.07.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 07/30/2013] [Indexed: 11/20/2022] Open
Abstract
The present study reports voltammetric reduction of nitazoxanide in Britton–Robinson (B–R) buffer by cyclic and square-wave voltammetry at glassy carbon electrode. A versatile fully validated voltammetric method for quantitative determination of nitazoxanide in pharmaceutical formulation has been proposed. A squrewave peak current was linear over the nitazoxanide concentration in the range of 20–140 µg/mL. The limit of detection (LOD) and limit of quantification (LOQ) was calculated to be 5.23 μg/mL and 17.45 μg/mL, respectively.
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