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Abd-Elsabour M, Abou-Krisha MM, Kenawy SH, Yousef TA. A Novel Electrochemical Sensor Based on an Environmentally Friendly Synthesis of Magnetic Chitosan Nanocomposite Carbon Paste Electrode for the Determination of Diclofenac to Control Inflammation. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1079. [PMID: 36985972 PMCID: PMC10058736 DOI: 10.3390/nano13061079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 02/25/2023] [Accepted: 02/28/2023] [Indexed: 06/18/2023]
Abstract
A simple and eco-friendly electrochemical sensor for the anti-inflammatory diclofenac (DIC) was developed in a chitosan nanocomposite carbon paste electrode (M-Chs NC/CPE). The M-Chs NC/CPE was characterized with FTIR, XRD, SEM, and TEM for the size, surface area, and morphology. The produced electrode showed a high electrocatalytic activity to use the DIC in 0.1 M of the BR buffer (pH 3.0). The effect of scanning speed and pH on the DIC oxidation peak suggests that the DIC electrode process has a typical diffusion characteristic with two electrons and two protons. Furthermore, the peak current linearly proportional to the DIC concentration ranged from 0.025 M to 4.0 M with the correlation coefficient (r2). The sensitivity, limit of detection (LOD; 3σ), and the limit of quantification (LOQ; 10σ) were 0.993, 9.6 µA/µM cm2, 0.007 µM, and 0.024 µM, respectively. In the end, the proposed sensor enables the reliable and sensitive detection of DIC in biological and pharmaceutical samples.
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Affiliation(s)
- Mohamed Abd-Elsabour
- Chemistry Department, Faculty of Science, South Valley University, Qena 83523, Egypt
| | - Mortaga M. Abou-Krisha
- Chemistry Department, Faculty of Science, South Valley University, Qena 83523, Egypt
- Chemistry Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia
| | - Sayed H. Kenawy
- Chemistry Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia
- Refractories, Ceramics and Building Materials Department, National Research Centre, El-Buhouth St., Dokki, Giza 12622, Egypt
| | - Tarek A. Yousef
- Chemistry Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia
- Mansoura Laboratory, Toxic and Narcotic Drug, Forensic Medicine Department, Medicolegal Organization, Ministry of Justice, Cairo 11435, Egypt
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2
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Motoc S, Manea F, Baciu A, Vasilie S, Pop A. Highly sensitive and simultaneous electrochemical determinations of non-steroidal anti-inflammatory drugs in water using nanostructured carbon-based paste electrodes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 846:157412. [PMID: 35853524 DOI: 10.1016/j.scitotenv.2022.157412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 07/04/2022] [Accepted: 07/12/2022] [Indexed: 06/15/2023]
Abstract
Simple and fast simultaneous quantifications in water of anti-inflammatory drugs, which belong to the emerging pollutants, represents a great challenge for water quality control. The development of electrochemical methods to meet the simultaneous and concomitant detection requirements depends mainly on the electrode material. The fullerene‑carbon nanofiber (FULL/CNF) and graphene‑carbon nanotubes (GR/CNT) paste electrodes as sensing elements were employed for the first time for the determination of diclofenac (DCF), naproxen (NPX) and ibuprofen (IBP) simultaneously and concomitantly. The comparative morphostructural and electrochemical characterizations of both electrodes were achieved by scanning electron microscopy (SEM) and cyclic voltammetry (CV). Differential-pulsed voltammetry (DPV), chronoamperometry (CA) and multiple-pulsed amperometry (MPA) were used for detection tests. FULL/CNF electrode was suitable to develop a simultaneous DPV-based detection methodology that allowed reaching the lowest limit of detections of 0.230 nM for DCF, 0.310 nM for NPX and 0.180 nM for IBP. GR/CNT electrode did not provide stability for DPV-based detection, but the lowest limits of detection of 0.149 nM for DCF, 0.809 nM for NPX and 0.640 nM for IBP were achieved by MPA-based methodology. Both electrodes, linked to specific detection technique, showed good reproducibility, stability and ability to measure DCF, NPX and IBP simultaneously in aqueous solution. The satisfactory results achieved by analysis of real surface water sample (Bega River, Timisoara city, Romania) indicated that the proposed voltammetric and amperometric methodologies using both electrodes have great potential for practical applications in analysis of different water samples.
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Affiliation(s)
- Sorina Motoc
- "Coriolan Drăgulescu" Institute of Chemistry, Romanian Academy, 24 Mihai Viteazu Bvd., 300223 Timisoara, Romania
| | - Florica Manea
- Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, 6 Bv. V. Parvan, 300223 Timisoara, Romania.
| | - Anamaria Baciu
- Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, 6 Bv. V. Parvan, 300223 Timisoara, Romania
| | - Sergiu Vasilie
- Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, 6 Bv. V. Parvan, 300223 Timisoara, Romania
| | - Aniela Pop
- Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, 6 Bv. V. Parvan, 300223 Timisoara, Romania
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3
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Beitollahi H, Garkani Nejad F, Tajik S, Di Bartolomeo A. Screen-Printed Graphite Electrode Modified with Graphene-Co 3O 4 Nanocomposite: Voltammetric Assay of Morphine in the Presence of Diclofenac in Pharmaceutical and Biological Samples. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12193454. [PMID: 36234582 PMCID: PMC9565238 DOI: 10.3390/nano12193454] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 09/22/2022] [Accepted: 09/26/2022] [Indexed: 05/12/2023]
Abstract
This work focuses on the development of a novel electrochemical sensor for the determination of morphine in the presence of diclofenac. The facile synthesis of graphene-Co3O4 nanocomposite was performed. The prepared material (graphene-Co3O4 nanocomposite) was analyzed by diverse microscopic and spectroscopic approaches for its crystallinity, composition, and morphology. Concerning the electrochemical determinations, after drop-casting the as-fabricated graphene-Co3O4 nanocomposite on the surface of a screen-printed graphite electrode (SPGE), their electrochemical performance was scrutinized towards the morphine detection. It was also found that an SPGE modified by a graphene-Co3O4 nanocomposite exhibited better electrocatalytic activity for morphine oxidation than unmodified electrode. Under optimal conditions, the differential pulse voltammetry (DPV) was employed to explore the present sensor (graphene-Co3O4/SPGE), the findings of which revealed a linear dynamic range as broad as 0.02-575.0 µM and a limit of detection (LOD) as narrow as 0.007 μM. The sensitivity was estimated to be 0.4 µM/(µA cm2). Furthermore, the graphene-Co3O4/SPGE sensor demonstrated good analytical efficiency for sensing morphine in the presence of diclofenac in well-spaced anodic peaks. According to the DPV results, this sensor displayed two distinct peaks for the oxidation of morphine and diclofenac with 350 mV potential difference. In addition, the graphene-Co3O4/SPGE was explored for voltammetric determination of diclofenac and morphine in pharmaceutical and biological specimens of morphine ampoule, diclofenac tablet, and urine, where recovery rates close to 100% were recorded for all of the 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 P.O. Box 76318-85356, Iran
- Correspondence: (H.B.); (A.D.B.)
| | - Fraiba Garkani Nejad
- Department of Chemistry, Faculty of Science, Shahid Bahonar University of Kerman, Kerman P.O. Box 76175-133, Iran
| | - Somayeh Tajik
- Research Center of Tropical and Infectious Diseases, Kerman University of Medical Sciences, Kerman P.O. Box 76169-13555, Iran
| | - Antonio Di Bartolomeo
- Department of Physics “E.R. Caianaiello”, University of Salerno, 84084 Fisciano, Salerno, Italy
- Correspondence: (H.B.); (A.D.B.)
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4
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Lazanas AC, Prodromidis MI. Large surface vanadium pentoxide nanosheet modified screen-printed electrode for nanomolar diclofenac determination. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Torrinha Á, Oliveira TMBF, Ribeiro FWP, de Lima-Neto P, Correia AN, Morais S. (Bio)Sensing Strategies Based on Ionic Liquid-Functionalized Carbon Nanocomposites for Pharmaceuticals: Towards Greener Electrochemical Tools. NANOMATERIALS 2022; 12:nano12142368. [PMID: 35889592 PMCID: PMC9319828 DOI: 10.3390/nano12142368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 07/01/2022] [Accepted: 07/07/2022] [Indexed: 11/22/2022]
Abstract
The interaction of carbon-based nanomaterials and ionic liquids (ILs) has been thoroughly exploited for diverse electroanalytical solutions since the first report in 2003. This combination, either through covalent or non-covalent functionalization, takes advantage of the unique characteristics inherent to each material, resulting in synergistic effects that are conferred to the electrochemical (bio)sensing system. From one side, carbon nanomaterials offer miniaturization capacity with enhanced electron transfer rates at a reduced cost, whereas from the other side, ILs contribute as ecological dispersing media for the nanostructures, improving conductivity and biocompatibility. The present review focuses on the use of this interesting type of nanocomposites for the development of (bio)sensors specifically for pharmaceutical detection, with emphasis on the analytical (bio)sensing features. The literature search displayed the conjugation of more than 20 different ILs and several carbon nanomaterials (MWCNT, SWCNT, graphene, carbon nanofibers, fullerene, and carbon quantum dots, among others) that were applied for a large set (about 60) of pharmaceutical compounds. This great variability causes a straightforward comparison between sensors to be a challenging task. Undoubtedly, electrochemical sensors based on the conjugation of carbon nanomaterials with ILs can potentially be established as sustainable analytical tools and viable alternatives to more traditional methods, especially concerning in situ environmental analysis.
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Affiliation(s)
- Álvaro Torrinha
- REQUIMTE-LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4249-015 Porto, Portugal;
| | - Thiago M. B. F. Oliveira
- Centro de Ciência e Tecnologia, Universidade Federal do Cariri, Av. Tenente Raimundo Rocha, 1639, Cidade Universitária, Juazeiro do Norte 63048-080, Brazil;
| | - Francisco W. P. Ribeiro
- Instituto de Formação de Educadores, Universidade Federal do Cariri, Rua Olegário Emídio de Araújo, S/N, Centro, Brejo Santo 63260-000, Brazil;
| | - Pedro de Lima-Neto
- Centro de Ciências, Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Bloco 940, Campus do Pici, Fortaleza 60440-900, Brazil; (P.d.L.-N.); (A.N.C.)
| | - Adriana N. Correia
- Centro de Ciências, Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Bloco 940, Campus do Pici, Fortaleza 60440-900, Brazil; (P.d.L.-N.); (A.N.C.)
| | - Simone Morais
- REQUIMTE-LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4249-015 Porto, Portugal;
- Correspondence:
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6
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Zine A, Ferkhi M, Khaled A, Kuyumcu Savan E. A2BO4±δ as New Materials for Electrocatalytic Detection of Paracetamol and Diclofenac Drugs. Electrocatalysis (N Y) 2022. [DOI: 10.1007/s12678-022-00745-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Kaya SI, Cetinkaya A, Ozkan SA. Carbon Nanomaterial-Based Drug Sensing Platforms Using State-of-the-
Art Electroanalytical Techniques. CURR ANAL CHEM 2022. [DOI: 10.2174/1573411016999200802024629] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
Currently, nanotechnology and nanomaterials are considered as the most popular and outstanding
research subjects in scientific fields ranging from environmental studies to drug analysis. Carbon nanomaterials such as
carbon nanotubes, graphene, carbon nanofibers etc. and non-carbon nanomaterials such as quantum dots, metal
nanoparticles, nanorods etc. are widely used in electrochemical drug analysis for sensor development. Main aim of drug
analysis with sensors is developing fast, easy to use and sensitive methods. Electroanalytical techniques such as
voltammetry, potentiometry, amperometry etc. which measure electrical parameters such as current or potential in an
electrochemical cell are considered economical, highly sensitive and versatile techniques.
Methods:
Most recent researches and studies about electrochemical analysis of drugs with carbon-based nanomaterials were
analyzed. Books and review articles about this topic were reviewed.
Results:
The most significant carbon-based nanomaterials and electroanalytical techniques were explained in detail. In
addition to this; recent applications of electrochemical techniques with carbon nanomaterials in drug analysis was expressed
comprehensively. Recent researches about electrochemical applications of carbon-based nanomaterials in drug sensing were
given in a table.
Conclusion:
Nanotechnology provides opportunities to create functional materials, devices and systems using
nanomaterials with advantageous features such as high surface area, improved electrode kinetics and higher catalytic
activity. Electrochemistry is widely used in drug analysis for pharmaceutical and medical purposes. Carbon nanomaterials
based electrochemical sensors are one of the most preferred methods for drug analysis with high sensitivity, low cost and
rapid detection.
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Affiliation(s)
- S. Irem Kaya
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, 06560, Ankara,Turkey
| | - Ahmet Cetinkaya
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, 06560, Ankara,Turkey
| | - Sibel A. Ozkan
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, 06560, Ankara,Turkey
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8
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Kassahun GS, Griveau S, Bedioui F, Slim C. Input of Electroanalytical Methods for the Determination of Diclofenac: A Review of Recent Trends and Developments. ChemElectroChem 2021. [DOI: 10.1002/celc.202100734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Getnet Sewnet Kassahun
- Chimie ParisTech PSL Research University iCLeHS, CNRS, UMR 8060 11 rue Pierre et Marie Curie 75005 Paris France
| | - Sophie Griveau
- Chimie ParisTech PSL Research University iCLeHS, CNRS, UMR 8060 11 rue Pierre et Marie Curie 75005 Paris France
| | - Fethi Bedioui
- Chimie ParisTech PSL Research University iCLeHS, CNRS, UMR 8060 11 rue Pierre et Marie Curie 75005 Paris France
| | - Cyrine Slim
- Chimie ParisTech PSL Research University iCLeHS, CNRS, UMR 8060 11 rue Pierre et Marie Curie 75005 Paris France
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9
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Electrochemical Method for Ease Determination of Sodium Diclofenac Trace Levels in Water Using Graphene-Multi-Walled Carbon Nanotubes Paste Electrode. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 19:ijerph19010029. [PMID: 35010286 PMCID: PMC8750901 DOI: 10.3390/ijerph19010029] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Revised: 12/16/2021] [Accepted: 12/18/2021] [Indexed: 01/10/2023]
Abstract
Sodium diclofenac (DCF) presence reported in water use cycle at various concentrations including trace levels necessitates continuous development of advanced analytical method for its determination. In this work, ease electrochemical methods for DCF determination based on voltammetric and amperometric techniques were proposed using a simple combination of graphene with multi-walled carbon nanotubes as paste electrode. Integration of the graphene with multi-walled carbon nanotubes enlarged the electroactive surface area of the electrode and implicitly enhanced the electrochemical response for DCF determination. On the basis of the sorption autocatalytic effect manifested at low concentration of DCF, we found that the preconcentration step applied prior to differential-pulsed voltammetry (DPV) and multiple-pulsed amperometry (MPA) allowed for the enhancement of the electroanalytical performance of the DCF electrochemical detections, which were validated by testing in tap water. The lowest limit of detection (LOD) of 1.40 ng·L−1 was found using preconcentration prior to DPV under optimized operating conditions, which is better than that reached by other carbon-based electrodes reported in the literature.
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10
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Curreri AM, Mitragotri S, Tanner EEL. Recent Advances in Ionic Liquids in Biomedicine. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2004819. [PMID: 34245140 PMCID: PMC8425867 DOI: 10.1002/advs.202004819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 03/04/2021] [Indexed: 05/04/2023]
Abstract
The use of ionic liquids and deep eutectic solvents in biomedical applications has grown dramatically in recent years due to their unique properties and their inherent tunability. This review will introduce ionic liquids and deep eutectics and discuss their biomedical applications, namely solubilization of drugs, creation of active pharmaceutical ingredients, delivery of pharmaceuticals through biological barriers, stabilization of proteins and other nucleic acids, antibacterial agents, and development of new biosensors. Current challenges and future outlooks are discussed, including biocompatibility, the potential impact of the presence of impurities, and the importance of understanding the microscopic interactions in ionic liquids in order to design task-specific solvents.
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Affiliation(s)
- Alexander M. Curreri
- John A. Paulson School of Engineering and Applied SciencesHarvard UniversityCambridgeMA02138USA
- Wyss Institute of Biologically Inspired EngineeringBostonMA02115USA
| | - Samir Mitragotri
- John A. Paulson School of Engineering and Applied SciencesHarvard UniversityCambridgeMA02138USA
- Wyss Institute of Biologically Inspired EngineeringBostonMA02115USA
| | - Eden E. L. Tanner
- John A. Paulson School of Engineering and Applied SciencesHarvard UniversityCambridgeMA02138USA
- Present address:
Department of Chemistry and BiochemistryThe University of MississippiUniversityMS38677USA
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11
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Boumya W, Taoufik N, Achak M, Bessbousse H, Elhalil A, Barka N. Electrochemical sensors and biosensors for the determination of diclofenac in pharmaceutical, biological and water samples. TALANTA OPEN 2021. [DOI: 10.1016/j.talo.2020.100026] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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12
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Fabrication of Nanostructure Electrochemical Sensor Based on the Carbon Paste Electrode (CPE) Modified With Ionic Liquid and Fe3O4/ZIF-67 for Electrocatalytic Sulfamethoxazole Detection. Top Catal 2021. [DOI: 10.1007/s11244-021-01471-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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Li J, Shan X, Jiang D, Wang W, Xu F, Chen Z. Au nanoparticle plasmon-enhanced electrochemiluminescence aptasensor based on the 1D/2D PTCA/CoP for diclofenac assay. Mikrochim Acta 2021; 188:231. [PMID: 34132907 DOI: 10.1007/s00604-021-04879-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 05/27/2021] [Indexed: 12/01/2022]
Abstract
The combination of localized surface plasmon resonance (LSPR) and electrochemiluminescence (ECL) can be an effective way to amplify the signal intensity. In this work, an ECL aptasensor with 3,4,9,10-perylenetetracarboxylic acid-decorated cobalt phosphate (denoted as PTCA/CoP) as the ECL emitter and Au nanoparticles (NPs) as plasma was proposed for diclofenac assay. The prepared PTCA/CoP with special 1D/2D structure exhibited good ability and excellent ECL performance. The diclofenac aptamer acted as a bridge to link the PTCA/CoP and Au NPs; thus, the ECL performance of PTCA/CoP was greatly improved due to the plasma effect of Au NPs. Besides, it was found that the ECL signal of the aptasensor was obviously quenched by the introduction of diclofenac, which might be due to the transformation from the LSPR process to the resonance energy transform (RET) process. Under optimal conditions, the difference of ECL intensity was negatively correlated with the concentration of diclofenac in the range 0.1 pM to 10 μM with a low detection limit of 0.072 pM at the potential of -1.8 V vs. Ag/AgCl (S/N = 3). The aptasensor was proved to be suitable for the detection of diclofenac in real samples, suggesting its great practicability.
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Affiliation(s)
- Jingxian Li
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, China
| | - Xueling Shan
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, China.,Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, 213164, China
| | - Ding Jiang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, China.,Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, 213164, China
| | - Wenchang Wang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, China.,Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, 213164, China
| | - Fangmin Xu
- Institute of Forensic Science, Public Security Bureau of Jiangyin, Jiangyin, Jiangsu, China
| | - Zhidong Chen
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, China. .,Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, 213164, China.
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14
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Viscusi G, Gorrasi G. Facile preparation of layered double hydroxide (LDH)-alginate beads as sustainable system for the triggered release of diclofenac: Effect of pH and temperature on release rate. Int J Biol Macromol 2021; 184:271-281. [PMID: 34139243 DOI: 10.1016/j.ijbiomac.2021.05.217] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 05/27/2021] [Accepted: 05/29/2021] [Indexed: 11/19/2022]
Abstract
This paper concerns the facile preparation of alginate beads encapsulating layered double hydroxide (LDH) intercalated with diclofenac sodium as drug delivery systems. To better evaluate the effect of LDH carrier, alginate beads loaded with free diclofenac were also prepared. Composites hydrogel beads were ionotropically crosslinked in CaCl2 solution at 4 °C. Thermal and barrier properties were evaluated and correlated with the presence of the inorganic phase. Swelling behavior was investigated over time. Release kinetics of diclofenac at different pH and temperatures were evaluated. The diclofenac release behavior appeared to be affected by the presence of LDH, the pH of release medium and the temperature allowing for fabricating a sustainable composite characterized by a triggered drug release rate. Finally, empirical relationships correlating the drug diffusion as a function of temperature and pH were extrapolated.
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Affiliation(s)
- Gianluca Viscusi
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
| | - Giuliana Gorrasi
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy.
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15
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Topal BD, Sener CE, Kaya B, Ozkan SA. Nano-sized Metal and Metal Oxide Modified Electrodes for Pharmaceuticals Analysis. CURR PHARM ANAL 2021. [DOI: 10.2174/1573412916999200513110313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
:
The electrochemical analysis offers a number of important advantages such as providing
information on pharmaceuticals analysis and their in vivo redox processes and pharmacological activity.
The interest in developing electrochemical sensing devices for use in clinical assays is growing rapidly.
Metallic nanoparticles can be synthesized and modified with various chemical functional groups,
which allow them to be conjugated with antibodies, ligands, and drugs of interest.
:
In this article, the novel developments to enhance the performance of sensor modified with metal nanoparticles
of pharmaceuticals were reviewed. A discussion of the properties of metal nanostructures
and their application in drug analysis is presented. Their application as a modifier agent in determining
low levels of drugs in pharmaceutical dosage forms and biological samples is discussed. It has been
found that the electrocatalytic effect of the electrode, sensitivity and selectivity were increased using
various working electrodes modified with nano-sized metal, metal oxide and metal/metal oxide
particles.
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Affiliation(s)
- Burcu Dogan Topal
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, 06100, Tandogan, Ankara,Turkey
| | - Ceren Elif Sener
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, 06100, Tandogan, Ankara,Turkey
| | - Basak Kaya
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, 06100, Tandogan, Ankara,Turkey
| | - Sibel Aysıl Ozkan
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, 06100, Tandogan, Ankara,Turkey
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16
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Gold-Platinum Core-Shell Nanoparticles with Thiolated Polyaniline and Multi-Walled Carbon Nanotubes for the Simultaneous Voltammetric Determination of Six Drug Molecules. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9020024] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this proof-of-concept study, a novel nanocomposite of the thiolated polyaniline (tPANI), multi-walled carbon nanotubes (MWCNTs) and gold–platinum core-shell nanoparticles (Au@Pt) (tPANI-Au@Pt-MWCNT) was synthesized and utilized to modify a glassy carbon electrode (GCE) for simultaneous voltammetric determination of six over-the-counter (OTC) drug molecules: ascorbic acid (AA), levodopa (LD), acetaminophen (AC), diclofenac (DI), acetylsalicylic acid (AS) and caffeine (CA). The nanocomposite (tPANI-Au@Pt-MWCNT) was characterized with transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). Using the sensor (GCE-tPANI-Au@Pt-MWCNT) in connection with differential pulse voltammetry (DPV), the calibration plots were determined to be linear up to 570.0, 60.0, 60.0, 115.0, 375.0 and 520.0 µM with limit of detection (LOD) of 1.5, 0.25, 0.15, 0.2, 2.0, and 5.0 µM for AA, LD, AC, DI, AS and CA, respectively. The nanocomposite-modified sensor was successfully used for the determination of these redox-active compounds in commercially available OTC products such as energy drinks, cream and tablets with good recovery yields ranging from 95.48 ± 0.53 to 104.1 ± 1.63%. We envisage that the electrochemical sensor provides a promising platform for future applications towards the detection of redox-active drug molecules in pharmaceutical quality control studies and forensic investigations.
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17
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Bahadori Y, Razmi H. Design of an electrochemical platform for the determination of diclofenac sodium utilizing a graphenized pencil graphite electrode modified with a Cu–Al layered double hydroxide/chicken feet yellow membrane. NEW J CHEM 2021. [DOI: 10.1039/d1nj02258j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A novel electrochemical sensor based on a Cu–Al layered double hydroxide (Cu–Al LDH)/chicken feet yellow membrane (CFYM) modified graphenized pencil graphite electrode (GPGE) was designed.
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Affiliation(s)
- Younes Bahadori
- Department of Chemistry
- Faculty of Basic Sciences
- Azarbaijan Shahid Madani University
- Tabriz
- Iran
| | - Habib Razmi
- Department of Chemistry
- Faculty of Basic Sciences
- Azarbaijan Shahid Madani University
- Tabriz
- Iran
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18
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Amra S, Bourouina M, Bourouina Bacha S, Hauchard D. Preconcentration and Successful Selective Detection of Traces of Diclofenac in Water using a Nanostructured Modified Carbon Paste Electrode. ELECTROANAL 2020. [DOI: 10.1002/elan.202060415] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Siham Amra
- Département de Chimie, Faculté des Sciences Exactes Université A. Mira Bejaia 06000 Algérie
- Univ Rennes Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR – UMR6226 F-35000 Rennes France
| | - Mustapha Bourouina
- Département de Chimie, Faculté des Sciences Exactes Université A. Mira Bejaia 06000 Algérie
| | - Saliha Bourouina Bacha
- Département de Génie des procédés, Faculté de technologie Université A. Mira Bejaia 06000 Algérie
| | - Didier Hauchard
- Univ Rennes Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR – UMR6226 F-35000 Rennes France
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19
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Dondo N, Shumba M, Moyo M, Nyoni S. Simultaneous non-steroidal anti-inflammatory drug electrodetection on nitrogen doped carbon nanodots and nanosized cobalt phthallocyanine conjugate modified glassy carbon electrode. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2020.09.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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20
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Diclofenac determination using CeO2 nanoparticle modified screen-printed electrodes – A study of background correction. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105258] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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21
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Kaya SI, Karabulut TC, Kurbanoglu S, Ozkan SA. Chemically Modified Electrodes in Electrochemical Drug Analysis. CURR PHARM ANAL 2020. [DOI: 10.2174/1573412915666190304140433] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Electrode modification is a technique performed with different chemical and physical methods
using various materials, such as polymers, nanomaterials and biological agents in order to enhance
sensitivity, selectivity, stability and response of sensors. Modification provides the detection of small
amounts of analyte in a complex media with very low limit of detection values. Electrochemical methods
are well suited for drug analysis, and they are all-purpose techniques widely used in environmental
studies, industrial fields, and pharmaceutical and biomedical analyses. In this review, chemically modified
electrodes are discussed in terms of modification techniques and agents, and recent studies related
to chemically modified electrodes in electrochemical drug analysis are summarized.
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Affiliation(s)
- Sariye I. Kaya
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, Ankara, Turkey
| | - Tutku C. Karabulut
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, Ankara, Turkey
| | - Sevinç Kurbanoglu
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, Ankara, Turkey
| | - Sibel A. Ozkan
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, Ankara, Turkey
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22
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Torrinha Á, Oliveira TMBF, Ribeiro FW, Correia AN, Lima-Neto P, Morais S. Application of Nanostructured Carbon-Based Electrochemical (Bio)Sensors for Screening of Emerging Pharmaceutical Pollutants in Waters and Aquatic Species: A Review. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1268. [PMID: 32610509 PMCID: PMC7408367 DOI: 10.3390/nano10071268] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 06/20/2020] [Accepted: 06/22/2020] [Indexed: 01/13/2023]
Abstract
Pharmaceuticals, as a contaminant of emergent concern, are being released uncontrollably into the environment potentially causing hazardous effects to aquatic ecosystems and consequently to human health. In the absence of well-established monitoring programs, one can only imagine the full extent of this problem and so there is an urgent need for the development of extremely sensitive, portable, and low-cost devices to perform analysis. Carbon-based nanomaterials are the most used nanostructures in (bio)sensors construction attributed to their facile and well-characterized production methods, commercial availability, reduced cost, high chemical stability, and low toxicity. However, most importantly, their relatively good conductivity enabling appropriate electron transfer rates-as well as their high surface area yielding attachment and extraordinary loading capacity for biomolecules-have been relevant and desirable features, justifying the key role that they have been playing, and will continue to play, in electrochemical (bio)sensor development. The present review outlines the contribution of carbon nanomaterials (carbon nanotubes, graphene, fullerene, carbon nanofibers, carbon black, carbon nanopowder, biochar nanoparticles, and graphite oxide), used alone or combined with other (nano)materials, to the field of environmental (bio)sensing, and more specifically, to pharmaceutical pollutants analysis in waters and aquatic species. The main trends of this field of research are also addressed.
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Affiliation(s)
- Álvaro Torrinha
- REQUIMTE-LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4249-015 Porto, Portugal;
| | - Thiago M. B. F. Oliveira
- Centro de Ciência e Tecnologia, Universidade Federal do Cariri, Av. Tenente Raimundo Rocha, 1639, Cidade Universitária, 63048-080 Juazeiro do Norte, CE, Brazil;
| | - Francisco W.P. Ribeiro
- Instituto de Formação de Educadores, Universidade Federal do Cariri, Rua Olegário Emídio de Araújo, S/N, Centro, 63260-000 Brejo Santo - CE, Brazil;
| | - Adriana N. Correia
- GELCORR, Departamento de Química Analítica e Físico-Química, Centro de Ciências, Universidade Federal do Ceará, Bloco 940, Campus do Pici, 60455-970 Fortaleza-CE, Brazil; (A.N.C.); (P.L.-N.)
| | - Pedro Lima-Neto
- GELCORR, Departamento de Química Analítica e Físico-Química, Centro de Ciências, Universidade Federal do Ceará, Bloco 940, Campus do Pici, 60455-970 Fortaleza-CE, Brazil; (A.N.C.); (P.L.-N.)
| | - Simone Morais
- REQUIMTE-LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4249-015 Porto, Portugal;
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Soltani R, Guo S, Bianco A, Ménard‐Moyon C. Carbon Nanomaterials Applied for the Treatment of Inflammatory Diseases: Preclinical Evidence. ADVANCED THERAPEUTICS 2020. [DOI: 10.1002/adtp.202000051] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Rym Soltani
- CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR 3572 University of Strasbourg, ISIS Strasbourg 67000 France
| | - Shi Guo
- CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR 3572 University of Strasbourg, ISIS Strasbourg 67000 France
| | - Alberto Bianco
- CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR 3572 University of Strasbourg, ISIS Strasbourg 67000 France
| | - Cécilia Ménard‐Moyon
- CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR 3572 University of Strasbourg, ISIS Strasbourg 67000 France
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Abstract
Background:
This review investigates the ophthalmic drugs that have been studied with
voltammetry in the web of science database in the last 10 years.
Introduction:
Ophthalmic drugs are used in the diagnosis, evaluation and treatment of various ophthalmological
diseases and conditions. A significant literature has emerged in recent years that investigates
determination of these active compounds via electroanalytical methods, particularly voltammetry. Low
cost, rapid determination, high availability, efficient sensitivity and simple application make voltammetry
one of the most used methods for determining various kinds of drugs including ophthalmic ones.
Methods:
In this particular review, we searched the literature via the web of science database for ophthalmic
drugs which are investigated with voltammetric techniques using the keywords of voltammetry,
electrochemistry, determination and electroanalytical methods.
Results:
We found 33 types of pharmaceuticals in nearly 140 articles. We grouped them clinically into
seven major groups as antibiotics, antivirals, non-steroidal anti-inflammatory drugs, anti-glaucomatous
drugs, steroidal drugs, local anesthetics and miscellaneous. Voltammetric techniques, electrodes, optimum
pHs, peak potentials, limit of detection values, limit of quantification values, linearity ranges,
sample type and interference effects were compared.
Conclusion:
Ophthalmic drugs are widely used in the clinic and it is important to determine trace
amounts of these species analytically. Voltammetry is a preferred method for its ease of use, high sensitivity,
low cost, and high availability for the determination of ophthalmic drugs as well as many other
medical drugs. The low limits of detection values indicate that voltammetry is quite sufficient for determining
ophthalmic drugs in many media such as human serum, urine and ophthalmic eye drops.
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Affiliation(s)
- Onur Inam
- Department of Ophthalmology, Ulucanlar Eye Training and Research Hospital, University of Health Sciences, Ankara, Turkey
| | - Ersin Demir
- Department of Analytical Chemistry, Faculty of Pharmacy, Afyonkarahisar University of Health Sciences, Afyonkarahisar, 03200, Turkey
| | - Bengi Uslu
- Department of Analytical Chemistry, Ankara University, Faculty of Pharmacy, Ankara, Turkey
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Sasal A, Tyszczuk-Rotko K, Wójciak M, Sowa I. First Electrochemical Sensor (Screen-Printed Carbon Electrode Modified with Carboxyl Functionalized Multiwalled Carbon Nanotubes) for Ultratrace Determination of Diclofenac. MATERIALS 2020; 13:ma13030781. [PMID: 32046335 PMCID: PMC7040793 DOI: 10.3390/ma13030781] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 01/31/2020] [Accepted: 02/05/2020] [Indexed: 11/17/2022]
Abstract
A simple, sensitive and time-saving differential-pulse adsorptive stripping voltammetric (DPAdSV) procedure using a screen-printed carbon electrode modified with carboxyl functionalized multiwalled carbon nanotubes (SPCE/MWCNTs-COOH) for the determination of diclofenac (DF) is presented. The sensor was characterized using optical profilometry, SEM, and cyclic voltammetry (CV). The use of carboxyl functionalized MWCNTs as a SPCE modifier improved the electron transfer process and the active surface area of sensor. Under optimum conditions, very sensitive results were obtained with a linear range of 0.1–10.0 nmol L−1 and a limit of detection value of 0.028 nmol L−1. The SPCE/MWCNTs-COOH also exhibited satisfactory repeatability, reproducibility, and selectivity towards potential interferences. Moreover, for the first time, the electrochemical sensor allows determining the real concentrations of DF in environmental water samples without sample pretreatment steps.
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Affiliation(s)
- Agnieszka Sasal
- Faculty of Chemistry, Institute of Chemical Sciences, Maria Curie-Skłodowska University, 20-031 Lublin, Poland;
| | - Katarzyna Tyszczuk-Rotko
- Faculty of Chemistry, Institute of Chemical Sciences, Maria Curie-Skłodowska University, 20-031 Lublin, Poland;
- Correspondence: (K.T.-R.); (M.W.)
| | - Magdalena Wójciak
- Department of Analytical Chemistry, Medical University of Lublin, 20-093 Lublin, Poland;
- Correspondence: (K.T.-R.); (M.W.)
| | - Ireneusz Sowa
- Department of Analytical Chemistry, Medical University of Lublin, 20-093 Lublin, Poland;
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Honakeri NC, Malode SJ, Kulkarni RM, Shetti NP. Electrochemical behavior of diclofenac sodium at coreshell nanostructure modified electrode and its analysis in human urine and pharmaceutical samples. SENSORS INTERNATIONAL 2020. [DOI: 10.1016/j.sintl.2020.100002] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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27
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Khesri Hammadi H, Khodadoust S. Extraction of diclofenac by SiO
2
‐NH
2
@Fe
3
O
4
and its determination: Central composite design. J Sep Sci 2019; 43:470-477. [DOI: 10.1002/jssc.201900887] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 10/11/2019] [Accepted: 10/11/2019] [Indexed: 11/12/2022]
Affiliation(s)
- Hanadi Khesri Hammadi
- Department of ChemistryBehbahan Khatam Alanbia University of Technology Behbahan Iran
| | - Saeid Khodadoust
- Department of ChemistryBehbahan Khatam Alanbia University of Technology Behbahan Iran
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28
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Costa-Rama E, Nouws H, Delerue-Matos C, Blanco-López M, Fernández-Abedul M. Preconcentration and sensitive determination of the anti-inflammatory drug diclofenac on a paper-based electroanalytical platform. Anal Chim Acta 2019; 1074:89-97. [DOI: 10.1016/j.aca.2019.05.016] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2019] [Revised: 05/05/2019] [Accepted: 05/07/2019] [Indexed: 01/14/2023]
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29
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Portable and low-cost biosensor towards on-site detection of diclofenac in wastewater. Talanta 2019; 203:242-247. [DOI: 10.1016/j.talanta.2019.05.058] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 05/10/2019] [Accepted: 05/13/2019] [Indexed: 11/30/2022]
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Slim C, Tlili N, Richard C, Griveau S, Bedioui F. Amperometric detection of diclofenac at a nano-structured multi-wall carbon nanotubes sensing films. INORG CHEM COMMUN 2019. [DOI: 10.1016/j.inoche.2019.107454] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Abstract
Background:
The determination of drugs in pharmaceutical formulations and human biologic fluids is
important for pharmaceutical and medical sciences. Successful analysis requires low sensitivity, high selectivity
and minimum interference effects. Current analytical methods can detect drugs at very low levels but these methods
require long sample preparation steps, extraction prior to analysis, highly trained technical staff and high-cost
instruments. Biosensors offer several advantages such as short analysis time, high sensitivity, real-time analysis,
low-cost instruments, and short pretreatment steps over traditional techniques. Biosensors allow quantification not
only of the active component in pharmaceutical formulations, but also the degradation products and metabolites in
biological fluids. The present review gives comprehensive information on the application of biosensors for drug
discovery and analysis. Moreover, this review focuses on the fabrication of these biosensors.
Methods:
Biosensors can be classified as the utilized bioreceptor and the signal transduction mechanism. The classification
based on signal transductions includes electrochemical optical, thermal or acoustic. Electrochemical and
optic transducers are mostly utilized transducers used for drug analysis. There are many biological recognition elements,
such as enzymes, antibodies, cells that have been used in fabricating of biosensors. Aptamers and antibodies
are the most widely used recognition elements for the screening of the drugs. Electrochemical sensors and biosensors
have several advantages such as low detection limits, a wide linear response range, good stability and reproducibility.
Optical biosensors have several advantages such as direct, real-time and label-free detection of many
biological and chemical substances, high specificity, sensitivity, small size and low cost. Modified electrodes enhance
sensitivity of the electrodes to develop a new biosensor with desired features. Chemically modified electrodes
have gained attention in drug analysis owing to low background current, wide potential window range, simple
surface renewal, low detection limit and low cost. Modified electrodes produced by modifying of a solid surface
electrode via different materials (carbonaceous materials, metal nanoparticles, polymer, biomolecules) immobilization.
Recent advances in nanotechnology offer opportunities to design and construct biosensors. Unique features
of nanomaterials provide many advantages in the fabrication of biosensors. Nanomaterials have controllable
chemical structures, large surface to volume ratios, functional groups on their surface. To develop proteininorganic
hybrid nanomaterials, four preparation methods have been used. These methods are immobilization, conjugation,
crosslinking and self-assembly. In the present manuscript, applications of different biosensors, fabricated
by using several materials, for drug analysis are reviewed. The biosensing strategies are investigated and discussed
in detail.
Results:
Several analytical techniques such as chromatography, spectroscopy, radiometry, immunoassays and electrochemistry
have been used for drug analysis and quantification. Methods based on chromatography require timeconsuming
procedure, long sample-preparation steps, expensive instruments and trained staff. Compared to chromatographic
methods, immunoassays have simple protocols and lower cost. Electrochemical measurements have
many advantages over traditional chemical analyses and give information about drug quantity, metabolic fate of
drugs, and pharmacological activity. Moreover, the electroanalytical methods are useful to determine drugs sensitively
and selectivity. Additionally, these methods decrease analysis cost and require low-cost instruments and
simple sample pretreatment steps.
Conclusion:
In recent years, drug analyses are performed using traditional techniques. These techniques have a
good detection limit, but they have some limitations such as long analysis time, expensive device and experienced
personnel requirement. Increased demand for practical and low-cost analytical techniques biosensor has gained interest
for drug determinations in medical sciences. Biosensors are unique and successful devices when compared to
traditional techniques. For drug determination, different electrode modification materials and different biorecognition
elements are used for biosensor construction. Several biosensor construction strategies have been developed to
enhance the biosensor performance. With the considerable progress in electrode surface modification, promotes the
selectivity of the biosensor, decreases the production cost and provides miniaturization. In the next years, advances
in technology will provide low cost, sensitive, selective biosensors for drug analysis in drug formulations and biological
samples.
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Affiliation(s)
- Elif Burcu Aydin
- Namik Kemal University, Scientific and Technological Research Center, Tekirdag, Turkey
| | - Muhammet Aydin
- Namik Kemal University, Scientific and Technological Research Center, Tekirdag, Turkey
| | - Mustafa Kemal Sezginturk
- Canakkale Onsekiz Mart University, Faculty of Engineering, Bioengineering Department, Canakkale, Turkey
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Karadurmus L, Sahin IF, Kurbanoglu S, Ozkan SA. Electrochemical Determination of Non-Steroidal Anti-Inflammatory Drugs. CURR ANAL CHEM 2019. [DOI: 10.2174/1573411014666180917113920] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Electrochemical methods have been used for the determination of nonsteroidal antiinflammatory
drugs (NSAID) just as used in the determination of various drugs. Among voltammetric
methods; differential pulse voltammetric method, square wave voltammetric method and linear
sweep voltammetric method are the most commonly used ones. NSAIDs are widely used in the
treatment of inflammatory conditions such as musculoskeletal disorders (rheumatoid arthritis, osteoarthritis,
acute gouty arthritis) and dental pain, menstrual pain, postoperative pain and migraine. In
this review, some selected recent electrochemical studies were selected related to the nonsteroidal antiinflammatory
drug analyzes. The aim of this review is to evaluate and discuss the advantages, details
and usages of electroanalytical methods in the determination of nonsteroidal anti-inflammatory drug.
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Affiliation(s)
- Leyla Karadurmus
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, Ankara, Turkey
| | - I. Firat Sahin
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, Ankara, Turkey
| | - Sevinc Kurbanoglu
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, Ankara, Turkey
| | - Sibel A. Ozkan
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, Ankara, Turkey
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Guzmán MF, Mendoza Huizar LH, Galán Vidal CA, Morales GR, Álvarez Romero GA. A Box-Behnken Optimized Methodology for the Quantification of Diclofenac using a Carbon Paste-Multiwalled Carbon Nanotubes Electrode. CURR ANAL CHEM 2019. [DOI: 10.2174/1573411014666180423151749] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
Diclofenac is a widely used nonsteroidal anti-inflammatory drug. Recent
studies have shown that frequent consumption of this drug in high concentrations can cause heart diseases,
so strict control of diclofenac’s quantity in commercial drugs is necessary. This paper presents
the development of an optimized voltammetric methodology for the quantification of diclofenac,
which offers some advantages over other electrochemical and accepted methods.
Objective:
Optimize with a Box-Behnken design the differential pulse voltammetry parameters towards
the quantification of diclofenac in pharmaceutical samples.
Methods:
Diclofenac behavior in the working electrode was evaluated by cyclic voltammetry, in order
to stablish the best conditions for diclofenac’s quantification. A Box-Behnken design was then used to
optimize the differential pulse voltammetry parameters and stablish the analytical behavior of the proposed
methodology. Commercial tablets were prepared for analysis according to the Pharmacopeia,
the DPV optimized methodology was used to quantify diclofenac in the samples, and the results were
statistically compared with those obtained with the official methodology.
Results:
After optimization, the analytical parameters found were: correlation coefficient of 0.998, detection
limit of 0.001 µM, quantification limit of 0.0033 µM and sensitivity of 0.299 µA.µM-1. The
statistical analysis showed there were no significant differences between the results obtained with the
proposed methodology and those obtained with the official methodology.
Conclusion:
The statistical analysis showed that the proposed methodology is as reliable as the official
spectrophotometric one for the quantification of diclofenac in commercial drugs, with very competitive
analytical parameters, and even better to others found with more complex electrodes.
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Affiliation(s)
- Miriam Franco Guzmán
- Universidad Autonoma del Estado de Hidalgo, Area Academica de Quimica, Carretera Pachuca-Tulancingo Km 4.5. C.P 42184, Mineral de la Reforma, Hidalgo, Mexico
| | - Luis Humberto Mendoza Huizar
- Universidad Autonoma del Estado de Hidalgo, Area Academica de Quimica, Carretera Pachuca-Tulancingo Km 4.5. C.P 42184, Mineral de la Reforma, Hidalgo, Mexico
| | - Carlos Andrés Galán Vidal
- Universidad Autonoma del Estado de Hidalgo, Area Académica de Quimica, Carretera Pachuca-Tulancingo Km 4.5. C.P 42184, Mineral de la Reforma, Hidalgo, Mexico
| | - Gabriela Roa Morales
- UAEM-UNAM, Centro Conjunto de Investigacion en Quimica Sustentable, Carretera Km. 14.5, Unidad San Cayetano, 50200, Toluca - Atlacomulco, Toluca de Lerdo, Mex, Mexico
| | - Giaan A. Álvarez Romero
- Universidad Autonoma del Estado de Hidalgo, Area Academica de Quimica, Carretera Pachuca-Tulancingo Km 4.5. C.P 42184, Mineral de la Reforma, Hidalgo, Mexico
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Shalauddin M, Akhter S, Basirun WJ, Bagheri S, Anuar NS, Johan MR. Hybrid nanocellulose/f-MWCNTs nanocomposite for the electrochemical sensing of diclofenac sodium in pharmaceutical drugs and biological fluids. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.03.003] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Eteya MM, Rounaghi GH, Deiminiat B. Fabrication of a new electrochemical sensor based on Au Pt bimetallic nanoparticles decorated multi-walled carbon nanotubes for determination of diclofenac. Microchem J 2019. [DOI: 10.1016/j.microc.2018.09.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Ferrone V, Carlucci M, Ettorre V, Cotellese R, Palumbo P, Fontana A, Siani G, Carlucci G. Dispersive magnetic solid phase extraction exploiting magnetic graphene nanocomposite coupled with UHPLC-PDA for simultaneous determination of NSAIDs in human plasma and urine. J Pharm Biomed Anal 2018; 161:280-288. [DOI: 10.1016/j.jpba.2018.08.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 07/30/2018] [Accepted: 08/03/2018] [Indexed: 01/01/2023]
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37
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Schirmer C, Posseckardt J, Kick A, Rebatschek K, Fichtner W, Ostermann K, Schuller A, Rödel G, Mertig M. Encapsulating genetically modified Saccharomyces cerevisiae cells in a flow-through device towards the detection of diclofenac in wastewater. J Biotechnol 2018; 284:75-83. [PMID: 30110597 DOI: 10.1016/j.jbiotec.2018.08.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 08/03/2018] [Accepted: 08/07/2018] [Indexed: 02/08/2023]
Abstract
Recently it has been proposed to use sensors based on genetically engineered reporter cells to perform continuous online water monitoring. Here we describe the design, assembly and performance of a novel flow-through device with immobilized genetically modified yeast cells that produce a fluorescent protein upon stimulation with diclofenac whose intensity is then detected by fluorescence microscopy. Although other devices employing immobilized cells for the detection of various analytes have already been described before, as novelty our system allows safe enclosure of the sensor cells, and thus, to obtain fluorescent signals that are not falsified by a loss of cells. Furthermore, the yeast cells are prevented from being released into the environment. Despite the safe containment, the immobilized reporter cells are accessible to nutrients and analytes. They thus have both the ability to grow and respond to the analyte. Both in cell culture medium and standardized synthetic wastewater, we are able to differentiate between diclofenac concentrations in a range from 10 to 100 μM. As particularly interesting feature, we show that only the biologically active fraction of diclofenac is detected. Nowadays, contamination of wastewater with diclofenac and other pharmaceutical residues is becoming a severe problem. Our investigations may pave the way for an easy-to-use and cost-efficient wastewater monitoring method.
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Affiliation(s)
- C Schirmer
- Kurt-Schwabe-Institut Meinsberg, Kurt-Schwabe-Str.4, 04736 Waldheim, Germany.
| | - J Posseckardt
- Kurt-Schwabe-Institut Meinsberg, Kurt-Schwabe-Str.4, 04736 Waldheim, Germany.
| | - A Kick
- Kurt-Schwabe-Institut Meinsberg, Kurt-Schwabe-Str.4, 04736 Waldheim, Germany.
| | - K Rebatschek
- Kurt-Schwabe-Institut Meinsberg, Kurt-Schwabe-Str.4, 04736 Waldheim, Germany.
| | - W Fichtner
- Kurt-Schwabe-Institut Meinsberg, Kurt-Schwabe-Str.4, 04736 Waldheim, Germany.
| | - K Ostermann
- Institut für Genetik, Technische Universität Dresden, 01062 Dresden, Germany.
| | - A Schuller
- Institut für Genetik, Technische Universität Dresden, 01062 Dresden, Germany.
| | - G Rödel
- Institut für Genetik, Technische Universität Dresden, 01062 Dresden, Germany.
| | - M Mertig
- Kurt-Schwabe-Institut Meinsberg, Kurt-Schwabe-Str.4, 04736 Waldheim, Germany; Professur für Physikalische Chemie, Mess-und Sensortechnik, Technische Universität Dresden, 01062 Dresden, Germany.
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El-Wekil MM, Alkahtani SA, Ali HRH, Mahmoud AM. Advanced sensing nanomaterials based carbon paste electrode for simultaneous electrochemical measurement of esomeprazole and diclofenac sodium in human serum and urine samples. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.04.120] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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39
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Aptamer-based sensor for diclofenac quantification using carbon nanotubes and graphene oxide decorated with magnetic nanomaterials. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2017. [DOI: 10.1007/s13738-017-1259-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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40
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Roohi H, Ghauri K, Salehi R. Non-covalent green functionalization of boron nitride nanotubes with tunable aryl alkyl ionic liquids: A quantum chemical approach. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.08.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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41
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Kurbanoglu S, Ozkan SA. Electrochemical carbon based nanosensors: A promising tool in pharmaceutical and biomedical analysis. J Pharm Biomed Anal 2017; 147:439-457. [PMID: 28780997 DOI: 10.1016/j.jpba.2017.06.062] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 06/22/2017] [Accepted: 06/27/2017] [Indexed: 12/19/2022]
Abstract
Nanotechnology has become very popular in the sensor fields in recent times. It is thought that the utilization of such technologies, as well as the use of nanosized materials, could well have beneficial effects for the performance of sensors. Nano-sized materials have been shown to have a number of novel and interesting physical and chemical properties. Low-dimensional nanometer-sized materials and systems have defined a new research area in condensed-matter physics within past decades. Apart from the aforesaid categories of materials, there exist various materials of different types for fabricating nanosensors. Carbon is called as a unique element, due to its magnificent applications in many areas. Carbon is an astonishing element that can be found many forms including graphite, diamond, fullerenes, and graphene. This review provides an overview of some of the important and recent developments brought about by the application of carbon based nanostructures to nanotechnology for both chemical and biological sensor development and their application in pharmaceutical and biomedical area.
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Affiliation(s)
- Sevinc Kurbanoglu
- Ankara University, Faculty of Pharmacy, Department of Analytical Chemistry, 06100, Tandogan, Ankara, Turkey
| | - Sibel A Ozkan
- Ankara University, Faculty of Pharmacy, Department of Analytical Chemistry, 06100, Tandogan, Ankara, Turkey.
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42
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Impedimetric biosensor based on bimetallic AgPt nanoparticle-decorated carbon nanotubes as highly conductive film surface. J Solid State Electrochem 2017. [DOI: 10.1007/s10008-017-3532-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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43
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Enhanced-Oxidation and Highly Sensitive Detection of Tartrazine in Foodstuffs via New Platform Based on Poly(5-Sulfosalicylic Acid)/Cu(OH)2 Nanoparticles. FOOD ANAL METHOD 2017. [DOI: 10.1007/s12161-016-0782-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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44
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Arvand M, Pourhabib A, Giahi M. Square wave voltammetric quantification of folic acid, uric acid and ascorbic acid in biological matrix. J Pharm Anal 2017; 7:110-117. [PMID: 29404025 PMCID: PMC5686866 DOI: 10.1016/j.jpha.2017.01.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 12/28/2016] [Accepted: 01/07/2017] [Indexed: 11/15/2022] Open
Abstract
Nowadays, modified electrodes with metal nanoparticles have appeared as an alternative for the electroanalysis of various compounds. In this study, gold nanoparticles (GNPs) were chosen as interesting metal nanoparticles for modifying of carbon paste electrode (CPE). GNPs and the gold nanoparticles-modified carbon paste electrode (GNPs/CPE) were characterized by UV–Vis spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). GNPs/CPE as a simple and sensitive electrode was used to study three important biological molecules: folic acid (FA), uric acid (UA) and ascorbic acid (AA). Square wave voltammetry (SWV) was used as an accurate technique for quantitative measurements. A good linear relation was observed between anodic peak current (ipa) and FA (5.2 × 10−6 – 2.5 × 10−5 M), UA (1.2 × 10−6 – 2.1 × 10−5 M) and AA (1.2 × 10−6 – 2.5 × 10−5 M) concentrations in simultaneous determination of these molecules.
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Affiliation(s)
- Majid Arvand
- Electroanalytical Chemistry Laboratory, Faculty of Science, University of Guilan, Namjoo Street, P.O. Box: 1914, Rasht, Iran
| | - Akram Pourhabib
- Education Organization of Guilan Province, Farhang Square, P.O. Box: 41849-83111, Rasht, Iran
| | - Masoud Giahi
- Department of Chemistry, Faculty of Science, Lahijan Branch, Islamic Azad University, P.O. Box: 1616, Lahijan, Iran
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Guzmán-Hernández DS, Cid-Cerón MM, Romero-Romo M, Ramírez-Silva MT, Páez-Hernández ME, Corona-Avendaño S, Palomar-Pardavé M. Taking advantage of CTAB micelles for the simultaneous electrochemical quantification of diclofenac and acetaminophen in aqueous media. RSC Adv 2017. [DOI: 10.1039/c7ra07269d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Cetyltrimethylammonium bromide hemimicelles, formed on the surfaces of a carbon paste electrode, selectively adsorbed diclofenac molecules from a neutral aqueous solution containing acetaminophen, allowing simultaneous quantification of both drugs.
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Affiliation(s)
| | - M. M. Cid-Cerón
- Universidad Autónoma Metropolitana-Iztapalapa
- Departamento de Química
- CDMX
- Mexico
| | - M. Romero-Romo
- Universidad Autónoma Metropolitana-Azcapotzalco
- Departamento de Materiales
- CDMX
- Mexico
| | - M. T. Ramírez-Silva
- Universidad Autónoma Metropolitana-Iztapalapa
- Departamento de Química
- CDMX
- Mexico
| | | | - S. Corona-Avendaño
- Universidad Autónoma Metropolitana-Azcapotzalco
- Departamento de Materiales
- CDMX
- Mexico
| | - M. Palomar-Pardavé
- Universidad Autónoma Metropolitana-Azcapotzalco
- Departamento de Materiales
- CDMX
- Mexico
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Derikvand H, Roushani M, Abbasi AR, Derikvand Z, Azadbakht A. Design of folding-based impedimetric aptasensor for determination of the nonsteroidal anti-inflammatory drug. Anal Biochem 2016; 513:77-86. [DOI: 10.1016/j.ab.2016.06.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Revised: 06/07/2016] [Accepted: 06/08/2016] [Indexed: 11/24/2022]
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47
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Gold nanoparticle/multi-walled carbon nanotube modified glassy carbon electrode as a sensitive voltammetric sensor for the determination of diclofenac sodium. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 59:168-176. [DOI: 10.1016/j.msec.2015.09.097] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 09/24/2015] [Accepted: 09/27/2015] [Indexed: 11/24/2022]
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48
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Okoth OK, Yan K, Liu L, Zhang J. Simultaneous Electrochemical Determination of Paracetamol and Diclofenac Based on Poly(diallyldimethylammonium chloride) Functionalized Graphene. ELECTROANAL 2015. [DOI: 10.1002/elan.201500360] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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49
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Goodarzian M, Khalilzade MA, Karimi F, Kumar Gupta V, Keyvanfard M, Bagheri H, Fouladgar M. Square wave voltammetric determination of diclofenac in liquid phase using a novel ionic liquid multiwall carbon nanotubes paste electrode. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.04.037] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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50
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Lucas FWDS, Mascaro LH, Fill TP, Rodrigues-Filho E, Franco-Junior E, Homem-de-Mello P, de Lima-Neto P, Correia AN. Diclofenac on boron-doped diamond electrode: from electroanalytical determination to prediction of the electrooxidation mechanism with HPLC-ESI/HRMS and computational simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:5645-5654. [PMID: 24806390 DOI: 10.1021/la4044123] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Using square-wave voltammetry coupled to the boron-doped diamond electrode (BDDE), it was possible to develop an analytical methodology for identification and quantification of diclofenac (DCL) in tablets and synthetic urine. The electroanalytical procedure was validated, with results being statistically equal to those obtained by chromatographic standard method, showing linear range of 4.94 × 10(-7) to 4.43 × 10(-6) mol L(-1), detection limit of 1.15 × 10(-7) mol L(-1), quantification limit of 3.85 × 10(-7) mol L(-1), repeatability of 3.05% (n = 10), and reproducibility of 1.27% (n = 5). The association of electrochemical techniques with UV-vis spectroscopy, computational simulations and HPLC-ESI/HRMS led us to conclude that the electrooxidation of DCL on the BDDE involved two electrons and two protons, where the products are colorful and easily hydrolyzable dimers. Density functional theory calculations allowed to evaluate the stability of dimers A, B, and C, suggesting dimer C was more stable than the other two proposed structures, ca. 4 kcal mol(-1). The comparison of the dimers stabilities with the stabilities of the molecular ions observed in the MS, the compounds that showed retention time (RT) of 15.53, 21.44, and 22.39 min were identified as the dimers B, C, and A, respectively. Corroborating the observed chromatographic profile, dimer B had a dipole moment almost twice higher than that of dimers A and C. As expected, dimer B has really shorter RT than dimers A and C. The majority dimer was the A (71%) and the C (19.8%) should be the minority dimer. However, the minority was the dimer B, which was formed in the proportion of 9.2%. This inversion between the formation proportion of dimer B and dimer C can be explained by preferential conformation of the intermediaries (cation-radicals) on the surface.
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Affiliation(s)
- Francisco Willian de S Lucas
- Departamento de Química Analítica e Físico-Química, Centro de Ciências, Universidade Federal do Ceará , Bloco 940 Campus do Pici, 60440-900, Fortaleza - CE Brazil
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