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El-Kamel RS, Fekry AM. Enhanced modified poly-tyrosine voltammetric sensor for the quantification detection of salivary pepsin. Int J Biol Macromol 2024; 277:134178. [PMID: 39067726 DOI: 10.1016/j.ijbiomac.2024.134178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2024] [Revised: 07/23/2024] [Accepted: 07/24/2024] [Indexed: 07/30/2024]
Abstract
Pepsin as an aspartic acid protease member and one of the three foremost proteolytic enzymes in the digestive system is essential to be detected. An electrochemically polymerized tyrosine film on carbon paste electrode (pTyr/CPE) has been synthesized by electro-polymerization donating an affordable electrochemical sensor to sense salivary pepsin as a diagnostic technique for gastroesophageal reflux disease (GRD) due to saliva collection is non-invasive and relatively comfortable. The pTyr/CPE was applied for Voltammetric sensing of pepsin and its quantification in phosphate buffer solution of pH 2.0 (PBS). Scanning electron microscopy (SEM) was conducted to learn the surface morphology. Cyclic voltammetry (CV), differential pulse voltammetry (DPVs), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) were developed to realize the electrocatalytic activity of the sensor. The pTyr/CPE proceeded as a sensitive detector to pepsin with two linear ranges from 1 to 20 & 20 to 100 ng/mL donating two limits of detection as 0.5 & 0.09 ng/mL, respectively, and high selectivity toward pepsin, as well as stability and fast response of 1.5 s. Consequently, it is guessed that the pTyr/CPE sensor could be supportive for the initial diagnosis of GRD through the detection of pepsin in saliva. Finally, we quantified the pepsin levels in saliva samples of LPR patients (n = 2), showing that the results were agreeable with those from the electrochemical sensor.
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Affiliation(s)
- Renad S El-Kamel
- Cairo University, Faculty of Science, Department of Chemistry, Giza, Egypt
| | - Amany M Fekry
- Cairo University, Faculty of Science, Department of Chemistry, Giza, Egypt.
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2
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Hindam FT, Eltanany BM, Abou Al Alamein AM, El Nashar RM, Arafa RM. A voltammetric method coupled with chemometrics for determination of a ternary antiparkinson mixture in its dosage form: greenness assessment. BMC Chem 2024; 18:90. [PMID: 38725000 PMCID: PMC11080133 DOI: 10.1186/s13065-024-01189-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 04/16/2024] [Indexed: 05/12/2024] Open
Abstract
An electroanalytical methodology was developed by direct differential pulse voltammetric (DPV) measurement of Levodopa (LD), Carbidopa (CD) and Entacapone (ENT) mixture using bare glassy carbon electrode (GCE) in Britton Robinson (BR) buffer (pH = 2.0). A multivariate calibration model was then applied to the exported preprocessed voltammetric data using partial least square (PLS) as a chemometric tool. Additionally, the model was cross-validated and the number of latent variables (LVs) were determined to produce a reliable model for simultaneous quantitation of the three drugs either in their synthetic mixtures or in their marketed pharmaceutical formulation with high accuracy and precision. Data preprocessing was used to tackle the problem of lacking bi-linearity which is commonly found in electrochemical data. The proposed chemometric model was able to provide fast and reliable technique for quantitative determination of antiparkinson drugs in their dosage forms. This was successfully achieved by utilizing sixteen mixtures as calibration set and nine mixtures as validation set. The percent recoveries for LD, CD and ENT were found to be 100.05% ± 1.28%, 100.04% ± 0.53% and 99.99% ± 1.25%, respectively. The obtained results of the proposed method were statistically compared to those of a previously reported High Performance Liquid Chromatography (HPLC) methodology. Finally, the presented analytical method strongly supports green analytical chemistry regarding the minimization of potentially dangerous chemicals and solvents, as well as reducing energy utilization and waste generation.
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Affiliation(s)
| | - Basma M Eltanany
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, P.O. Box 11562, Cairo, Egypt
| | - Amal M Abou Al Alamein
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, P.O. Box 11562, Cairo, Egypt
| | - Rasha M El Nashar
- Chemistry Department, Faculty of Science, Cairo University, P.O. Box 12613, Giza, Egypt
| | - Reham M Arafa
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, P.O. Box 11562, Cairo, Egypt.
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3
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Hendawy HA, M. G. Eldin G, Fekry AM. A metal substituted nano ferrite (M = Zn, Cu, Fe and mn; x = 0 and 0.5)] improved Screen-Printed electrode for anodic determination of Toldimfos sodium. Microchem J 2023. [DOI: 10.1016/j.microc.2022.108267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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4
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Nigović B. New approach on sensitive analysis of pimavanserin, levodopa and entacapone based on synergistic effect of graphene nanoplatelets and graphitized carbon nanotubes in functionalized polymer matrix. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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5
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Medany SS, Elkamel RS, Abdel-Gawad SA, Fekry AM. A Novel Nano-Composite CSNPs/PVP/CoONPs Coating for Improving Corrosion Resistance of Ti-6Al-4V Alloy as a Dental Implant. METALS 2022; 12:1784. [DOI: 10.3390/met12111784] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
A new nano-coating of chitosan nanoparticles/polyvinylpyrrolidone/cobalt oxide nanoparticles (CSNPs/PVP/CoONPs) was performed in this work. The newly designed nano-coating comprises a copolymer and inorganic matrices. This nano-coating was used to cover the Ti-6Al-4V alloy surface as a newly designed dental alloy, and then its corrosion properties were studied through different electrochemical techniques. The results reveal that this novel coating improved the corrosion resistance of the Ti-6Al-4V alloy in artificial saliva solution by reaching 17.7 MΩ cm2. The new fabricated biocompatible coating (CSNPs/PVP/CoONPs) greatly enhanced the electrochemical corrosion resistance by giving a high protection efficiency of 90.87% and a low hydrogen evolution rate in artificial saliva solution at 37 °C. The observed results were confirmed by scanning electron microscopy (SEM), Vickers microhardness testing, coating thickness tests, high-resolution transmission electron microscopy (HRTEM), and energy-dispersive X-ray analysis (EDX).
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6
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An Innovative Simple Electrochemical Levofloxacin Sensor Assembled from Carbon Paste Enhanced with Nano-Sized Fumed Silica. BIOSENSORS 2022; 12:906. [PMID: 36291045 PMCID: PMC9599598 DOI: 10.3390/bios12100906] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 10/18/2022] [Indexed: 06/01/2023]
Abstract
A new electrochemical sensor for the detection of levofloxacin (LV) was efficiently realized. The aim was to develop a new, cheap, and simple sensor for the detection of LV, which is used in various infections due to its pharmacological importance. It consists of carbon paste (CP) enhanced with nano-sized fumed silica (NFS). NFS has a very low bulk density and a large surface area. The carbon paste-enhanced NFS electrode (NFS/CPE) showed great electrocatalytic activity in the oxidation of 1.0 mM LV in Britton–Robinson buffer (BR) at pH values ranging from 3.0 to 8.0. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used; the peak current value (Ip) of the NFS/CPE sensor was 2.7 times that of the bare electrode, ensuring its high electrocatalytic activity. Electrochemical impedance spectroscopy (EIS) was performed at a peak potential (Ep) of +1066 mV, yielding a resistance of 10 kΩ for the designed NFS/CPE sensor compared to 2461 kΩ for the bare electrode, indicating the high conductivity of the modified sensor and verifying the data observed using the CV technique. Surface descriptions were determined by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). The variation in the concentration of LV (2.0 to 1000 µM) was considered in BR buffer (pH = 5.0) at a scan rate (SR) of 10 mV/s by the NFS/CPE. The detection and quantification limits were 0.09 µM and 0.30 µM, respectively. To evaluate the application of LV in real samples, this procedure was established on Quinostarmax 500 mg tablets and human plasma samples. Reasonable results were obtained for the detection of LV.
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7
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Min H, Wu S, Han Z, Chen Z, Sun T, Shi W, Cheng P. Fast Detection of Entacapone by a Lanthanide-Organic Framework with Rhombic Channels. Chemistry 2021; 27:17459-17464. [PMID: 34608690 DOI: 10.1002/chem.202103297] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Indexed: 02/06/2023]
Abstract
Entacapone (ENT) is a powerful catechol-O-methyl transferase inhibitor that is used for the diagnosis and treatment of Parkinson's syndrome, but the amount used must be well controlled to avoid overtreatment and side effect. Fast and selective detection of ENT needs well-matched energy levels and well-designed sensor-ENT interaction which is highly challenging. In this work, a water stable europium-based metal-organic framework (Eu-TDA) was synthesized to detect ENT by luminescence with excellent reusability and selectivity in the presence of main coexisting and interference species of plasma with a limit of detection of 5.01 μM. The experimental results showed that the luminescence of Eu-TDA can be effectively quenched by ENT via well-designed photoinduced electron transfer mechanism and internal filtration effect mechanism in the system.
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Affiliation(s)
- Hui Min
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Shuangyan Wu
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Zongsu Han
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Zhonghang Chen
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Tiankai Sun
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Wei Shi
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.,Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Peng Cheng
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.,Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
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Radi A, Ragaa Abd‐Ellatief M. Molecularly Imprinted Poly‐o‐phenylenediamine Electrochemical Sensor for Entacapone. ELECTROANAL 2021. [DOI: 10.1002/elan.202100022] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Abd‐Elgawad Radi
- Department of Chemistry Faculty of Science Damietta University 34517 Damietta Egypt
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Zhao H, Du X, Dong H, Jin D, Tang F, Liu Q, Wang P, Chen L, Zhao P, Li Y. Electrochemical immunosensor based on Au/Co-BDC/MoS 2 and DPCN/MoS 2 for the detection of cardiac troponin I. Biosens Bioelectron 2020; 175:112883. [PMID: 33341318 DOI: 10.1016/j.bios.2020.112883] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 12/04/2020] [Accepted: 12/05/2020] [Indexed: 12/11/2022]
Abstract
The content of cardiac troponin I (CTnI) in human blood is the key factor in judging acute myocardial infarction (AMI). In order to detect the content of CTnI, we constructed a sandwich-type electrochemical immunosensor based on hydrogen peroxide (H2O2) as a signal source. Dendritic platinum-copper alloy nanoparticles (DPCN) loaded on molybdenum disulfide (MoS2) nanosheets (DPCN/MoS2) as secondary antibodies (Ab2) label provided signal amplification. The hollow three-dimensional (3D) pyramid-shaped structure of DPCN exposed abundant active sites and exhibited excellent catalytic properties. MoS2 nanosheets with flower-like structure and a larger specific surface area can effectively load more DPCN. The combination of MoS2 and DPCN enhanced the catalytic performance of DPCN/MoS2 towards H2O2 reduction and realized signal amplification. For the substrate material, the two-dimensional (2D) metal-organic framework (Co-BDC, 1,4-benzenedicarboxylate is abbreviated as BDC) was hybridized with MoS2 nanosheets to load gold nanoparticles (Au NPs). The obtained Au/Co-BDC/MoS2 had low catalytic activity and excellent electrical conductivity, which was used to load primary antibodies (Ab1) to effectively enhance the sensitivity. Under the best conditions, we constructed the immunosensor with the detection range of 10 fg/mL to 100 ng/mL and the limit of detection (LOD) of 3.02 fg/mL. At the same time, the content of CTnI in human serum was tested with satisfactory results. Therefore, the constructed immunosensor has important significance in the sensitive and accurate detection of CTnI and early diagnosis of AMI.
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Affiliation(s)
- Huan Zhao
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, PR China
| | - Xin Du
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, PR China
| | - Hui Dong
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, PR China
| | - Delin Jin
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, PR China
| | - Feng Tang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, PR China
| | - Qing Liu
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, PR China.
| | - Ping Wang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, PR China
| | - Lei Chen
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, PR China
| | - Peiqing Zhao
- Zibo Central Hospital, Shandong University, Zibo, 255036, PR China.
| | - Yueyun Li
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, PR China
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10
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Fekry AM, Abdel‐Gawad SA, Azab SM, Walcarius A. A Sensitive Electrochemical Sensor for Moxifloxacin Hydrochloride Based on Nafion/Graphene Oxide/Zeolite Modified Carbon Paste Electrode. ELECTROANAL 2020. [DOI: 10.1002/elan.202060355] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Amany M. Fekry
- Chemistry Department, Faculty of Science Cairo University Giza 12613 Egypt
- Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement (LCPME), UMR 7564 CNRS – Université de Lorraine 405 rue de Vandoeuvre 54600 Villers-les-Nancy France
| | | | - Shereen M. Azab
- Pharmaceutical Chemistry Dept. National Organization for Drug Control and Research [NODCAR] 6 Abu Hazem Street, Pyramids Ave, 29 Giza postcode is missing Egypt
| | - Alain Walcarius
- Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement (LCPME), UMR 7564 CNRS – Université de Lorraine 405 rue de Vandoeuvre 54600 Villers-les-Nancy France
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11
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Fekry AM, Mohamed GG, Abou Attia FM, Ibrahim NS, Azab SM. A nanoparticle modified carbon paste sensor for electrochemical determination of the antidepressant agent vilazodone. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.113305] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Mosammam MK, Ganjali MR, Habibi-Kool-Gheshlaghi M, Faridbod F. Electroanalysis of Catecholamine Drugs using Graphene Modified Electrodes. CURR ANAL CHEM 2019. [DOI: 10.2174/1573411014666180917113206] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Background:
Catecholamine drugs are a family of electroactive pharmaceutics, which are
widely analyzed through electrochemical methods. However, for low level online determination and
monitoring of these compounds, which is very important for clinical and biological studies, modified
electrodes having high signal to noise ratios are needed. Numerous materials including nanomaterials
have been widely used as electrode modifies for these families during the years. Among them, graphene
and its family, due to their remarkable properties in electrochemistry, were extensively used in
modification of electrochemical sensors.
Objective:
In this review, working electrodes which have been modified with graphene and its derivatives
and applied for electroanalyses of some important catecholamine drugs are considered.
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Affiliation(s)
- Mahya Karami Mosammam
- Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Mohammad Reza Ganjali
- Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Mona Habibi-Kool-Gheshlaghi
- Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Farnoush Faridbod
- Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
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Azab SM, Fekry AM. Role of Green Chemistry in Antipsychotics' Electrochemical Investigations Using a Nontoxic Modified Sensor in McIlvaine Buffer Solution. ACS OMEGA 2019; 4:25-30. [PMID: 31459308 PMCID: PMC6648889 DOI: 10.1021/acsomega.8b01972] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 12/11/2018] [Indexed: 05/03/2023]
Abstract
A new low-cost green electrochemical sensor based on nontoxic polyethylene glycol (PEG) and silver nanoparticles was used to improve the sensitivity of the carbon paste electrode for the investigation of olanzapine (OLZ) in dosage arrangements and in the existence of its coadministered drug fluoxetine and in the drug formulation. Scanning electron microscopy measurements were carried out to emphasize the morphology of the electrode surface. Cyclic voltammetry and differential pulse voltammetry were used to explore the diffusion and linearity behaviors of OLZ. Impedance spectroscopy measurements were determined to investigate the ac behavior of OLZ and then an ideal electrical circuit was modeled. A linear calibration was obtained from 1.0 × 10-8 to 1.25 × 10-4 M. The limit of detection was 1.5 × 10-9 M, whereas the limit of quantification was 5 × 10-9 M. The way has been wholly authenticated concerning linearity, precision, accuracy, reproducibility, sensitivity, and selectivity.
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Affiliation(s)
- Shereen M. Azab
- Pharmaceutical Chemistry
Department, National Organization for Drug
Control and Research, 6 Abu Hazem Street, Pyramids Avenue, P.O. Box 29, Giza 12613, Egypt
- E-mail: (S.M.A.)
| | - Amany M. Fekry
- Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt
- E-mail: (A.M.F.)
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Azab SM, Shehata M, Fekry AM. A novel electrochemical analysis of the legal psychoactive drug caffeine using a zeolite/MWCNT modified carbon paste sensor. NEW J CHEM 2019. [DOI: 10.1039/c9nj04070f] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Caffeine (Caf) is a natural central nervous system stimulant categorized by the US Food and Drug Administration as a safe drug and its maximal amount in soft drinks has been approximately determined to be lower than 200 mg L−1.
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Affiliation(s)
- Shereen M. Azab
- Pharmaceutical Chemistry Dept
- National Organization for Drug Control and Research [NODCAR]
- 6 Abu Hazem Street
- Pyramids Ave, 29
- Giza
| | - M. Shehata
- Chemistry Department
- Faculty of Science
- Cairo University
- Giza 12613
- Egypt
| | - Amany M. Fekry
- Chemistry Department
- Faculty of Science
- Cairo University
- Giza 12613
- Egypt
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15
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Aftab S, Ozcelikay G, Kurbanoglu S, Shah A, Iftikhar FJ, Ozkan SA. A novel electrochemical nanosensor based on NH 2-functionalized multi walled carbon nanotubes for the determination of catechol-orto-methyltransferase inhibitor entacapone. J Pharm Biomed Anal 2018; 165:73-81. [PMID: 30503895 DOI: 10.1016/j.jpba.2018.11.050] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 11/20/2018] [Accepted: 11/21/2018] [Indexed: 12/21/2022]
Abstract
In this study, an antiparkinson drug Entacapone (ENP) is electrochemically investigated under optimized conditions using NH2 functionalized multi walled carbon nanotubes (NH2fMWCNT) decorated over glassy carbon electrode (GCE). The surface morphology of the NH2fMWCNT/GCE was probed by scanning electron microscopy (SEM) armed with EDX analysis. Electrochemical impedance spectroscopy (EIS) was employed to investigate the electron transfer capability of modified and bare electrodes. Cyclic voltammetry was used to compare the redox response of ENP on the surface of modified and unmodified electrodes. The influence of interfering agents was also studied to examine the selectivity of the designed sensor. For the purpose of practical applicability of the proposed method, differential pulse voltammetric method was applied for the investigation of ENP in real samples i.e., tablet, human serum and urine. Almost 100% recovery percentages were obtained from tablet, serum and urine samples with RSD% values of less than 2% for all the samples, thus, suggesting promising applicability of the designed electrochemical sensing platform (NH2fMWCNT/GCE) for determination of ENP in pharmaceutical dosage and real samples.
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Affiliation(s)
- Saima Aftab
- Ankara University, Faculty of Pharmacy, Department of Analytical Chemistry, 06560, Ankara, Turkey; Department of Chemistry, Quaid-i-Azam University, 45320, Islamabad, Pakistan
| | - Goksu Ozcelikay
- Ankara University, Faculty of Pharmacy, Department of Analytical Chemistry, 06560, Ankara, Turkey
| | - Sevinc Kurbanoglu
- Ankara University, Faculty of Pharmacy, Department of Analytical Chemistry, 06560, Ankara, Turkey
| | - Afzal Shah
- Department of Chemistry, Quaid-i-Azam University, 45320, Islamabad, Pakistan; University of Bahrain, College of Science, Department of Chemistry, Sakhir, 32038, Bahrain
| | - Faiza Jan Iftikhar
- Department of Chemistry, Quaid-i-Azam University, 45320, Islamabad, Pakistan
| | - Sibel A Ozkan
- Ankara University, Faculty of Pharmacy, Department of Analytical Chemistry, 06560, Ankara, Turkey.
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16
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Electrochemical study of hydrochlorothiazide on electrochemically pre-treated pencil graphite electrode as a sensor. SENSING AND BIO-SENSING RESEARCH 2017. [DOI: 10.1016/j.sbsr.2017.09.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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17
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Palladium nanoparticles in electrochemical sensing of trace terazosin in human serum and pharmaceutical preparations. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 75:368-374. [DOI: 10.1016/j.msec.2017.02.061] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Revised: 11/23/2016] [Accepted: 02/14/2017] [Indexed: 01/03/2023]
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18
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Abdel-Ghany MF, Hussein LA, Ayad MF, Youssef MM. Investigation of different spectrophotometric and chemometric methods for determination of entacapone, levodopa and carbidopa in ternary mixture. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 171:236-245. [PMID: 27541796 DOI: 10.1016/j.saa.2016.07.053] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 07/24/2016] [Accepted: 07/31/2016] [Indexed: 06/06/2023]
Abstract
New, simple, accurate and sensitive UV spectrophotometric and chemometric methods have been developed and validated for determination of Entacapone (ENT), Levodopa (LD) and Carbidopa (CD) in ternary mixture. Method A is a derivative ratio spectra zero-crossing spectrophotometric method which allows the determination of ENT in the presence of both LD and CD by measuring the peak amplitude at 249.9nm in the range of 1-20μgmL-1. Method B is a double divisor-first derivative of ratio spectra method, used for determination of ENT, LD and CD at 245, 239 and 293nm, respectively. Method C is a mean centering of ratio spectra which allows their determination at 241, 241.6 and 257.1nm, respectively. Methods B and C could successfully determine the studied drugs in concentration ranges of 1-20μgmL-1 for ENT and 10-90μgmL-1 for both LD and CD. Methods D and E are principal component regression and partial least-squares, respectively, used for the simultaneous determination of the studied drugs by using seventeen mixtures as calibration set and eight mixtures as validation set. The developed methods have the advantage of simultaneous determination of the cited components without any pre-treatment. All the results were statistically compared with the reported methods, where no significant difference was observed. The developed methods were satisfactorily applied to the analysis of the investigated drugs in their pure form and in pharmaceutical dosage forms.
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Affiliation(s)
- Maha F Abdel-Ghany
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain-Shams University, Abbassia, Cairo 11566, Egypt
| | - Lobna A Hussein
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain-Shams University, Abbassia, Cairo 11566, Egypt
| | - Miriam F Ayad
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain-Shams University, Abbassia, Cairo 11566, Egypt
| | - Menatallah M Youssef
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain-Shams University, Abbassia, Cairo 11566, Egypt.
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19
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Mohammed MA, Attia AK, Elwy HM. Electrochemical Sensor Based on Multiwalled Carbon Nanotube, Alizarine Red S and Chitosan for Simultaneous Determination of Oxomemazine Hydrochloride, Paracetamol and Guaifenesin. ELECTROANAL 2016. [DOI: 10.1002/elan.201600311] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Mona A. Mohammed
- National Organization for Drug Control and Research; P. O. Box 29 Cairo Egypt
| | - Ali K. Attia
- National Organization for Drug Control and Research; P. O. Box 29 Cairo Egypt
| | - Hanan M. Elwy
- National Organization for Drug Control and Research; P. O. Box 29 Cairo Egypt
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Li J, Feng H, Jiang J, Feng Y, Xu Z, Qian D. One-pot in situ synthesis of a CoFe2O4nanoparticle-reduced graphene oxide nanocomposite with high performance for levodopa sensing. RSC Adv 2015. [DOI: 10.1039/c5ra15379d] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
We demonstrate that a new nanocomposite of CoFe2O4-reduced graphene oxide can be used as an enhanced electrochemical sensing platform for levodopa.
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Affiliation(s)
- Junhua Li
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha 410083
- PR China
- College of Chemistry and Materials Science
| | - Haibo Feng
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha 410083
- PR China
| | - Jianbo Jiang
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha 410083
- PR China
| | - Yonglan Feng
- College of Chemistry and Materials Science
- Hengyang Normal University
- Hengyang 421008
- PR China
| | - Zhifeng Xu
- College of Chemistry and Materials Science
- Hengyang Normal University
- Hengyang 421008
- PR China
| | - Dong Qian
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha 410083
- PR China
- State Key Laboratory of Powder Metallurgy
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