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Roy L, Pan N, Mondal S, Ghosh R, Hasan MN, Bhattacharyya N, Singh S, Bhattacharyya K, Chattopadhyay A, Pal SK. Ultrafast spectroscopic studies on the interaction of reactive oxygen species with a probe impregnated in nanoscopic and microscopic matrix formulation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 308:123671. [PMID: 38000325 DOI: 10.1016/j.saa.2023.123671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 11/09/2023] [Accepted: 11/19/2023] [Indexed: 11/26/2023]
Abstract
Reactive oxygen species (ROS) plays important role to maintain homeostasis in living bodies. Here we have studied interaction of ROS generated from hydrogen peroxide (H2O2) with a well-known spectroscopic probe Rose Bengal (RB) encapsulated in nanoscopic sodium dodecyl sulphate (SDS) micelles in aqueous medium and entrapped in microscopic nylon 66 solid matrix generated using electrospinning technique. A detailed spectroscopic characterization of ROS with SDS encapsulated RB (RB-SDS) shows efficient interaction compared to that in bulk medium. The time resolved analysis on the probe based on femtosecond resolved 2D-spectrum time images collected from streak camera reveal the simultaneous existence of an ultrafast electron (∼6 ps) and a hole transfer mechanism (∼93 ps) resulting from generation of hydroxyl radicals through photobleaching of the probe in presence of H2O2. Based on the spectroscopic and time resolved studies of RB in bulk and in restricted (SDS) medium, we have further translated it for the development of an in-field prototype device which utilizes RB as a ROS sensor impregnated in a nylon thin film. The microscopic nylon solid matrix characterized by scanning electron microscope (SEM) shows porous structure for holding sample containing ROS. Our study quantitatively measures the amount of ROS by using RB embedded microfiber membrane. Thus, our developed prototype device based on RB embedded on the nylon matrix would be beneficial for the potential use in quantification of ROS in extracellular fluids and food materials.
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Affiliation(s)
- Lopamudra Roy
- Department of Applied Optics and Photonics, JD-2, Sector-III, Salt Lake, Kolkata 700 106, India
| | - Nivedita Pan
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, Kolkata 700 106, India
| | - Susmita Mondal
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, Kolkata 700 106, India
| | - Ria Ghosh
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, Kolkata 700 106, India
| | - Md Nur Hasan
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, Kolkata 700 106, India
| | - Neha Bhattacharyya
- Department of Radio Physics and Electronics, University of Calcutta, 92, Acharya Prafulla Chandra Rd, Machuabazar, Kolkata 700009, India
| | - Soumendra Singh
- Department of Applied Optics and Photonics, JD-2, Sector-III, Salt Lake, Kolkata 700 106, India
| | - Kallol Bhattacharyya
- Department of Applied Optics and Photonics, JD-2, Sector-III, Salt Lake, Kolkata 700 106, India
| | - Arpita Chattopadhyay
- Department of Basic Science and Humanities, Techno International New Town, Block - DG 1/2 New Town, Action Area 1, Kolkata 700156, India.
| | - Samir Kumar Pal
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, Kolkata 700 106, India.
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Kalita S, Das DK. Fluorescent and Electrochemical Sensor Based on Basic Red 9 Dye Functionalised Graphene Oxide-Montmorillonite Composite for Selective Detection of Cerium (III) Ion. J Fluoresc 2023:10.1007/s10895-023-03570-z. [PMID: 38157086 DOI: 10.1007/s10895-023-03570-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 12/24/2023] [Indexed: 01/03/2024]
Abstract
In this work, graphene oxide (GO) has been prepared from used dry cells using modified Hummer's method and encapsulated with montmorillonite clay. To enhance its electrical property, the GO-MMT composite has been functionalised with Basic Red 9 dye. The sensor was characterized by various spectroscopic techniques like FT-IR spectroscopy, PXRD, SEM analysis, etc. Basic Red 9 dye functionalised GO-MMT composite has been employed for fluorescent and electrochemical detection of Ce3+ ion. The fluorescent turn-on sensing is sensitive, reversible and free from interference from other metal ions. The detection of Ce3+ ion by the sensor was also conducted in bovine serum albumin (BSA) medium. Pt electrode modified with the hybrid sensor produces excellent electrochemical change in presence of Ce3+ ion through cyclic voltammetry and square wave voltammetry technique. The limit of detection (LOD) from fluorescence spectroscopy, cyclic voltammetry and square wave voltammetry were calculated to be 0.6556 × 10- 9 M, 1.232 × 10- 9 M and 1.923 × 10- 9 M respectively.
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Affiliation(s)
- Sarojmoni Kalita
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India.
| | - Diganta Kumar Das
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India
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Tozihi M, Bahrami H, Zarifian M, Vahedpour M. Protonation of gabapentin: Ion mobility spectrometry and computational study. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2023; 29:220-230. [PMID: 37357727 DOI: 10.1177/14690667231184106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/27/2023]
Abstract
Protonation of gabapentin was studied using corona discharge ion mobility spectrometry with two types of reactant ions at temperature of 200°C. It was found that at elevated temperatures, ionization of gabapentin proceeds via two channels, including the protonation and reactant ion attachment, in the presence of both hydronium and ammonium reactant ions. The effect of the sample concentration on the relative intensity of product ion peaks was also studied. It turned out that in high concentrations, in addition to the protonation of gabapentin, binding of the reactant ion and the formation of proton-bound dimer also occurred, while in low concentrations, the only product of the ionization process is protonated gabapentin. Density functional theory (DFT) with B3LYP and M062X functionals employing the same basis set 6-311++G(d,p) was used to extend the experimental findings. The structures of the several conformers of neutral and protonated gabapentin were obtained. Based on them, topical proton affinity and topical gas-phase basicity of gabapentin were calculated for selected conformers. The attachment of reactant ions to neutral gabapentin and formation of proton-bound dimer were thermodynamically studied.
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Affiliation(s)
- Manijeh Tozihi
- Department of Chemistry, University of Zanjan, Zanjan, Iran
| | - Hamed Bahrami
- Department of Chemistry, University of Zanjan, Zanjan, Iran
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Yaseen B, Gangwar C, Kumar I, Sarkar J, Naik RM. Detailed Kinetic and Mechanistic Study for the Preparation of Silver Nanoparticles by a Chemical Reduction Method in the Presence of a Neuroleptic Agent (Gabapentin) at an Alkaline pH and its Characterization. ACS OMEGA 2022; 7:5739-5750. [PMID: 35224334 PMCID: PMC8867805 DOI: 10.1021/acsomega.1c05499] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Accepted: 01/27/2022] [Indexed: 05/05/2023]
Abstract
For the very first time, a detailed kinetic study for the preparation of silver nanoparticles (silver NPs) by neuroleptic agent gabapentin (GBP) in the absence of a stabilizer has been reported in this investigation. This paper is devoted to the preparation of silver nanoparticles by a chemical reduction method in which gabapentin acts as both a reductant and a stabilizer, and AgNO3 is used as a source of Ag+ ions and NaOH for maintaining the alkaline medium. A UV-visible spectrophotometer is used to monitor the progress of the reaction kinetics in an aqueous medium by changing the concentration of different variables such as AgNO3, NaOH, and gabapentin at 40 °C. It is found that the reaction rate follows a pseudo-first-order reaction. The thermodynamic activation parameters were also studied at five different temperatures (303, 308, 313, 318, and 323 K) and used in the support of the proposed mechanistic scheme for the formation of silver nanoparticles. The prepared silver nanoparticles were characterized using different techniques: UV-visible spectrophotometry, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, and powder X-ray diffraction. The average particle size was observed in the range of 5-45 nm.
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Kalita S, Das DK. Rosaniline Hydrochloride Encapsulated MCM-48: Fluorescent and Electrochemical Sensor for Dopamine. J Fluoresc 2021; 32:235-245. [PMID: 34713364 DOI: 10.1007/s10895-021-02840-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 10/18/2021] [Indexed: 11/30/2022]
Abstract
The dye Rosaniline hydrochloride (RANH) has been successfully incorporated in MCM-48 (designated as RANH@MCM-48) and characterized by various spectroscopic methods including FT-IR, SEM, EDX and N2 adsorption-desorption isotherm. RANH@MCM-48 in aqueous medium acts as fluorescence "on" sensor for neurotransmitter dopamine (DA) in presence of its main biological interfering agent ascorbic acid or vitamin c (AA) along with Glucose, Cholesterol and Uric acid (UA). The limits of detection (LOD) were found to be 65 nM and 51 nM respectively in absence and in presence of AA. The interaction of DA to RANH@MCM-48 is found to be reversible with respect to EDTA2-. The fluorescence intensity vs. pH plot shows a narrow fluorescence window of 7.2 to 8.8. RANH@MCM-48 has been successfully applied for DA detection in artificial cerebrospinal fluid (ACF) and bovine serum albumin (BSA) with LOD values 27 nM and 22.5 nM respectively. Platinum disc electrode has been modified with RANH@MCM-48 which showed distinct oxidation peaks with a separation of 0.188 V in cyclic voltammetry (CV). The LOD for DA in presence of AA determined from oxidation current is 77.5 nM. The voltammetric detection of DA is found to be free from common interfering species Na+, K+, Ca2+, Fe2+, UA, Cholesterol and Glucose. RANH@MCM-48 has been found to be a very effective fluorescence and voltammetric sensor for DA with very low LOD.
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Affiliation(s)
- Sarojmoni Kalita
- Department of Chemistry, Gauhati University, Guwahati, 781 014, India
| | - Diganta Kumar Das
- Department of Chemistry, Gauhati University, Guwahati, 781 014, India.
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Slepchenko GB, Moiseeva ES, Dorozhko EV, Ostapenko MS, Mezentseva OL, Auelbekova A, N'jung FK. An electrochemical sensor for detecting selenium in biological fluids on an arenediazonium tosylate-modified metal electrode. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:1584-1590. [PMID: 33725056 DOI: 10.1039/d1ay00156f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
This article presents the results on using a new electrochemical sensor modified with arenediazonium salts (MGE-Cu-COOH) to determine selenium in biological fluids (blood serum). It was shown that the sensitivity of the determination of selenite ions using this modified electrode is higher compared to that of the unmodified one (MGE-Cu). The effect of the concentration of arenediazonium tosylates on various substituents was studied, and the conditions for the production of the electrochemical sensor were developed. The surface of the modified electrode was investigated using SEM. The increase in the effective surface area of the electrode was found to be due to the formation of a system of ultramicroelectrodes. In biological samples, the LOD and LOQ of selenium were established at the levels of 0.057 and 0.166 μg l-1, respectively. Finally, the correctness of the results on selenium determination in real samples by the "input-found" method, which correlates well with the known value, was verified.
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Shetti NP, Mishra A, Bukkitgar SD, Basu S, Narang J, Raghava Reddy K, Aminabhavi TM. Conventional and Nanotechnology-Based Sensing Methods for SARS Coronavirus (2019-nCoV). ACS APPLIED BIO MATERIALS 2021; 4:1178-1190. [PMID: 34192244 PMCID: PMC7874501 DOI: 10.1021/acsabm.0c01545] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Accepted: 01/28/2021] [Indexed: 12/16/2022]
Abstract
Ongoing pandemic coronavirus (COVID-19) has affected over 218 countries and infected 88,512,243 and 1,906,853 deaths reported by Jan. 8, 2021. At present, vaccines are being developed in Europe, Russia, USA, and China, although some of these are in phase III of trials, which are waiting to be available for the general public. The only option available now is by vigorous testing, isolation of the infected cases, and maintaining physical and social distances. Numerous methods are now available or being developed for testing the suspected cases, which may act as carriers of the virus. In this review, efforts have been made to discuss the conventional as well as fast, rapid, and efficient testing methods developed for the diagnosis of 2019-nCoV.Testing methods can be based on the sensing of targets, which include RNA, spike proteins and antibodies such as IgG and IgM. Apart from the development of RNA targeted PCR, antibody and VSV pseudovirus neutralization assay along with several other diagnostic techniques have been developed. Additionally, nanotechnology-based sensors are being developed for the diagnosis of the virus, and these are also discussed.
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Affiliation(s)
- Nagaraj P. Shetti
- Center
for Electrochemical Science and Materials, Department of Chemistry, K.L.E. Institute of Technology, Hubballi 580 027, Karnataka, India
| | - Amit Mishra
- Department
of Chemical Engineering, Inha University, Incheon 22212,South Korea
| | - Shikandar D. Bukkitgar
- Center
for Electrochemical Science and Materials, Department of Chemistry, K.L.E. Institute of Technology, Hubballi 580 027, Karnataka, India
| | - Soumen Basu
- School
of Chemistry and Biochemistry, Thapar Institute
of Engineering & Technology, Patiala 147004, Punjab, India
| | - Jagriti Narang
- Department
of Biotechnology, School of Chemical and Life Sciences, Jamia Hamdard, Hamdard
Nagar, New Delhi 110062, India
| | - Kakarla Raghava Reddy
- School
of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Tejraj M. Aminabhavi
- Department
of Pharmaceutical Engineering, SET’s
College of Pharmacy, Dharwad, Karnataka 580 002, India
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Mehrabi A, Rahimnejad M, Mohammadi M, Pourali M. Electrochemical detection of Flutamide as an anticancer drug with gold nanoparticles modified glassy carbon electrode in the presence of prostate cancer cells. J APPL ELECTROCHEM 2021. [DOI: 10.1007/s10800-020-01519-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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US FDA-validated green GC-MS method for analysis of gabapentin, tramadol and/or amitriptyline mixtures in biological fluids. Bioanalysis 2020; 12:1521-1533. [PMID: 33118848 DOI: 10.4155/bio-2020-0217] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Background: Mixtures of gabapentin, tramadol and/or amitriptyline are usually recommended for treatment of neuropathic pain. Materials & methods/results: A novel GC-MS/MS method was developed to assess the studied mixture whether in pure forms or human biological fluids (plasma/urine). The chromatographic detection was performed using MS detector applying the selected ion-monitoring mode. An (Agilent, CA, USA) GC-MS with triple axis single quadrupole detector unit was used for the analysis equipped with HP-5MS (5% phenyl methyl siloxane) column. Helium was the carrier gas and positive electron impact ionization mode was applied. Conclusion: The developed method was able to assess the mixture components simultaneously within six minutes. Validation of the method was assured according to US FDA guidelines and Eco-Scale assessment.
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Electrochemical Detection of Paracetamol by Voltammetry Techniques Using Pure Zirconium Oxide Nanoparticle Based Modified Carbon Paste Electrode. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01743-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Ibrahim M, Ibrahim H, Almandil NB, Sayed MA, Kawde AN. A new hybrid nanocomposite electrode based on Au/CeO 2-decorated functionalized glassy carbon microspheres for the voltammetric sensing of quercetin and its interaction with DNA. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2020; 12:2846-2857. [PMID: 32930208 DOI: 10.1039/d0ay00507j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A new hybrid composite containing cerium oxide nanoparticle (CeO2NP) and gold nanoparticle (AuNP)-decorated functionalized glassy carbon microspheres (FGCM) was synthesized (Au/CeO2@FGCM). As a result, an Au/CeO2@FGCM-paraffin oil paste electrode (PE) (Au/CeO2@FGCM-PE) was fabricated and employed for the voltammetric sensing of quercetin (QRT). The structure and surface morphology of Au/CeO2@FGCM were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Cyclic voltammetry (CV), square wave voltammetry (SWV) and electrochemical impedance spectroscopy (EIS) were employed for the investigation of the electrochemical behavior of Au/CeO2@FGCM-PE. Under the optimum conditions, the SWV oxidation peak current showed linear dependence on the QRT concentration in the range from 48 nM to 1.09 μM. The achieved limits of detection and quantitation were 0.37 nM and 1.22 nM, respectively. Au/CeO2@FGCM-PE was reproducible, sensitive and stable and displayed anti-interference ability for various common interferents. The proposed method was also successfully applied for real sample analysis. The QRT content extracted from natural sources was determined, and satisfactory results were achieved. Furthermore, the interaction of QRT with salmon testes and calf thymus dsDNA (st-DNA and ct-DNA) on Au/CeO2@FGCM-PE was studied by CV and SWV. The corresponding binding constant (K), surface concentration (Γ), and Gibbs free energy (ΔG°) were computed for the free QRT and the bound QRT-dsDNA complex. The calculated K values for the QRT-ct-DNA and QRT-st-DNA complexes were found to be 6.24 × 105 M-1 and 3.63 × 105 M-1, respectively, which revealed that QRT strongly interacted with ct-DNA compared to that with st-DNA. The decreased intensity of the QRT oxidation peak resulting from its interaction with dsDNA provides a chance to use QRT as a new indicator to analyze ct-DNA and st-DNA.
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Affiliation(s)
- Mohamed Ibrahim
- Department of Clinical Pharmacy Research, Institute for Research and Medical Consultations, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia.
| | - Hossieny Ibrahim
- Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt.
| | - Noor B Almandil
- Department of Clinical Pharmacy Research, Institute for Research and Medical Consultations, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia.
| | - Marwa A Sayed
- Department of Industrial Pharmacy, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt
| | - Abdel-Nasser Kawde
- Chemistry Department, College of Sciences, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
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Zabihollahpoor A, Rahimnejad M, Najafpour-Darzi G, Moghadamnia AA. Recent advances in electroanalytical methods for the therapeutic monitoring of antiepileptic drugs: A comprehensive review. J Pharm Biomed Anal 2020; 188:113394. [PMID: 32504972 DOI: 10.1016/j.jpba.2020.113394] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 05/22/2020] [Accepted: 05/23/2020] [Indexed: 12/24/2022]
Abstract
Frequency of seizures is often managed by a wide group of antiepileptic drugs. Regarding the pharmacokinetic variability, narrow targeted range, and difficulty of detecting signs of toxicity based on laboratory responses, therapeutic monitoring of antiepileptic drugs can play a pivotal role in optimizing the drug dosage. Electrochemical sensors and biosensors can facilitate analysis of these drugs due to their unique advantages such as fast analysis, sensitivity, selectivity, and low cost. This review article, for the first time, describes the recent advances in electrochemical sensors and biosensors developed for the analysis of antiepileptic drugs. General electrochemical measuring techniques and types of applied electrode substrates were described first. To simplify the work, various chemical and biological modifiers applied to improve the sensitivity and selectivity of the sensors were classified and explained briefly. Finally, the future prospective on the development of electrochemical platforms in the quantification of antiepileptic drugs will be presented.
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Affiliation(s)
- Atieh Zabihollahpoor
- Biofuel and Renewable Energy Research Center, Department of Chemical Engineering, Babol Noshirvani University of Technology, Babol, Iran.
| | - Mostafa Rahimnejad
- Biofuel and Renewable Energy Research Center, Department of Chemical Engineering, Babol Noshirvani University of Technology, Babol, Iran.
| | - Ghasem Najafpour-Darzi
- Biotechnology Research Laboratory, Faculty of Chemical Engineering, Babol Noshirvani University of Technology, Babol, Iran.
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Gold nanoparticle prepared by electrochemical deposition for electrochemical determination of gabapentin as an antiepileptic drug. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.01.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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14
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Zablocka I, Wysocka-Zolopa M, Winkler K. Electrochemical Detection of Dopamine at a Gold Electrode Modified with a Polypyrrole⁻Mesoporous Silica Molecular Sieves (MCM-48) Film. Int J Mol Sci 2018; 20:ijms20010111. [PMID: 30597937 PMCID: PMC6337084 DOI: 10.3390/ijms20010111] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 12/13/2018] [Accepted: 12/20/2018] [Indexed: 11/16/2022] Open
Abstract
A gold electrode modified with a polypyrrole–mesoporous silica molecular sieves (polypyrrole—MCM-48) nanostructure film was used for the electrochemical determination of small concentrations of dopamine (DA) by cyclic voltammetry and square-wave voltammetry techniques. This electrode showed good electrocatalytic activity for the oxidation of dopamine. The oxidation potential of dopamine was decreased significantly compared with that obtained at the bare gold electrode. The observed linear range for the determination of the dopamine concentration, without interferents through cyclic voltammetry measurements, was from 10 μM to 1.2 mM (R2 = 0.9989) for the gold electrode modified with the polypyrrole—MCM-48 nanostructure, with a detection limit of 2.5 μM. In the case of square-wave voltammetry, the linear range was 2–250 μM, with a correlation coefficient of 0.9996, and the detection limit was estimated to be 0.7 μM. The effects of interferents, such as ascorbic acid (AA) and uric acid (UA), on the electrochemical detection of dopamine were also examined. The modified electrode can successfully separate the oxidation potentials for ascorbic acid and dopamine, shifting the oxidation peak potential of ascorbic acid to a more positive potential, and significantly decreasing the peak current. The presence of ascorbic acid increased the sensitivity of dopamine determination at the modified electrode, and the detection limit was estimated to be 0.5 μM with 0.1 mM ascorbic acid to imitate physiological solutions. Additionally, studies showed that the presence of uric acid does not affect the electrochemical detection of dopamine. The modified electrode can be successfully applied for the quantitative analysis of dopamine both with and without interferents.
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Affiliation(s)
- Izabela Zablocka
- Institute of Chemistry, University of Bialystok, Ciolkowskiego 1K, 15-245 Bialystok, Poland.
| | - Monika Wysocka-Zolopa
- Institute of Chemistry, University of Bialystok, Ciolkowskiego 1K, 15-245 Bialystok, Poland.
| | - Krzysztof Winkler
- Institute of Chemistry, University of Bialystok, Ciolkowskiego 1K, 15-245 Bialystok, Poland.
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15
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Oliveira PC, Maximiano EM, Oliveira PA, Camargo JS, Fiorucci AR, Arruda GJ. Direct electrochemical detection of glyphosate at carbon paste electrode and its determination in samples of milk, orange juice, and agricultural formulation. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2018; 53:817-823. [PMID: 30325268 DOI: 10.1080/03601234.2018.1505081] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 05/17/2018] [Indexed: 06/08/2023]
Abstract
This paper describes a simple, inexpensive, highly sensitive, selective, and efficient electrochemical method to determine glyphosate (GLY) in samples of milk, orange juice, and agricultural formulation. The oxidation reaction on the electrode surface was electrochemically characterised by cyclic voltammetry (CV) and square wave voltammetry (SWV). The investigation of GLY at carbon paste electrode revealed a non-reversible oxidation peak at +0.95 V versus Ag/AgCl, which was used for electrochemical detection of GLY. The operating parameters (pH, frequency, step potential, and amplitude) were optimised in relation to the peak current intensity, and a calibration curve was set up in a concentration range of 4.40 × 10-8-2.80 × 10-6 mol L-1, with a detection limit of 2 × 10-9 mol L-1. After calibration curve was plotted, the developed procedure was applied to determine GLY in previously contaminated samples: milk and orange juice, and in a commercial formulation, obtaining recovery values between 98.31% and 103.75%. These results show that the proposed method can be used for GLY quantification in different samples with high sensitivity, specificity, stability, and reproducibility.
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Affiliation(s)
- Pâmela C Oliveira
- a Research Center for Natural Resources, State University of Mato Grosso do Sul , Dourados , MS , Brazil
| | - Elizabete M Maximiano
- a Research Center for Natural Resources, State University of Mato Grosso do Sul , Dourados , MS , Brazil
| | - Poliane A Oliveira
- a Research Center for Natural Resources, State University of Mato Grosso do Sul , Dourados , MS , Brazil
| | - Junior S Camargo
- a Research Center for Natural Resources, State University of Mato Grosso do Sul , Dourados , MS , Brazil
| | - Antonio R Fiorucci
- a Research Center for Natural Resources, State University of Mato Grosso do Sul , Dourados , MS , Brazil
| | - Gilberto J Arruda
- a Research Center for Natural Resources, State University of Mato Grosso do Sul , Dourados , MS , Brazil
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The Selective Electrochemical Detection of Dopamine Using a Sulfated β-Cyclodextrin Carbon Paste Electrode. Electrocatalysis (N Y) 2017. [DOI: 10.1007/s12678-017-0402-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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17
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Ivić MLA, Petrović SD, Mijin DŽ. Contribution to the Recent Advances in Electrochemical Analysis of Pharmaceuticals. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/978-3-319-31849-3_2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023]
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18
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Electrochemical behavior of an anticancer drug 5-fluorouracil at methylene blue modified carbon paste electrode. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 65:262-8. [DOI: 10.1016/j.msec.2016.04.045] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 03/10/2016] [Accepted: 04/12/2016] [Indexed: 11/22/2022]
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19
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Bukkitgar SD, Shetti NP. Electrochemical Sensor for the Determination of Anticancer Drug 5- Fluorouracil at Glucose Modified Electrode. ChemistrySelect 2016. [DOI: 10.1002/slct.201600197] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Shikandar D. Bukkitgar
- Department of Chemistry; K.L.E. Institution of Technology; Opposite to airport, Gokul, Hubballi- 580030 Karnataka India
| | - Nagaraj P. Shetti
- Department of Chemistry; K.L.E. Institution of Technology; Opposite to airport, Gokul, Hubballi- 580030 Karnataka India
- Affiliated to Visvesvaraya Technological University, Belgavi; Karnataka India
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20
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Shetti NP, Nayak DS, Bukkitgar SD. Electrooxidation of antihistamine drug methdilazine and its analysis in human urine and blood samples. ACTA ACUST UNITED AC 2016. [DOI: 10.1080/23312009.2016.1153274] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Nagaraj P. Shetti
- Department of Chemistry, K. L. E. Institute of Technology, Gokul, Hubballi 580030, Karnataka, India
| | - Deepti S. Nayak
- Department of Chemistry, K. L. E. Institute of Technology, Gokul, Hubballi 580030, Karnataka, India
| | - Shikandar D. Bukkitgar
- Department of Chemistry, K. L. E. Institute of Technology, Gokul, Hubballi 580030, Karnataka, India
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21
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Bukkitgar SD, Shetti NP, Kulkarni RM, Doddamani MR. Electro-oxidation of nimesulide at 5% barium-doped zinc oxide nanoparticle modified glassy carbon electrode. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2015.12.023] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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Bukkitgar SD, Shetti NP. Electrochemical behavior of anticancer drug 5-fluorouracil at carbon paste electrode and its analytical application. J Anal Sci Technol 2016. [DOI: 10.1186/s40543-015-0080-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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23
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Veera Manohara Reddy Y, Prabhakara Rao V, Vijaya Bhaskar Reddy A, Lavanya M, Venu M, Lavanya M, Madhavi G. Determination of dopamine in presence of ascorbic acid and uric acid using poly (Spands Reagent) modified carbon paste electrode. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 57:378-86. [DOI: 10.1016/j.msec.2015.08.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 07/18/2015] [Accepted: 08/04/2015] [Indexed: 10/23/2022]
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24
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Kalate Bojdi M, Behbahani M, Mashhadizadeh MH, Bagheri A, Hosseiny Davarani SS, Farahani A. Mercapto-ordered carbohydrate-derived porous carbon electrode as a novel electrochemical sensor for simple and sensitive ultra-trace detection of omeprazole in biological samples. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 48:213-9. [DOI: 10.1016/j.msec.2014.12.006] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 10/22/2014] [Accepted: 12/03/2014] [Indexed: 12/28/2022]
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25
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Raoof JB, Hosseini SR, Mousavi-Sani SZ. Improved hydrogen evolution on glassy carbon electrode modified with novel Pt/cetyltrimethylammonium bromide nanoscale aggregates. CHINESE JOURNAL OF CATALYSIS 2015. [DOI: 10.1016/s1872-2067(14)60207-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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26
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Bukkitgar SD, Shetti NP, Kulkarni RM, Nandibewoor ST. Electro-sensing base for mefenamic acid on a 5% barium-doped zinc oxide nanoparticle modified electrode and its analytical application. RSC Adv 2015. [DOI: 10.1039/c5ra22581g] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
In the present work, surface enhanced electro-oxidation of mefenamic acid (MFA) at a glassy carbon electrode modified with 5% barium doped ZnO nanoparticles was studied.
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Affiliation(s)
- S. D. Bukkitgar
- Department of Chemistry
- K.L.E. Institute of Technology
- affiliated to Visvesvaraya Technological University Belagavi
- Hubli-580030
- India
| | - N. P. Shetti
- Department of Chemistry
- K.L.E. Institute of Technology
- affiliated to Visvesvaraya Technological University Belagavi
- Hubli-580030
- India
| | - R. M. Kulkarni
- Department of Chemistry
- K.L.S. Gogte Institute of Technology
- affiliated to Visveswaraya Technological University Belagavi
- Belagavi-590008
- India
| | - S. T. Nandibewoor
- P. G. Department of Studies in Chemistry
- Karnatak University
- Dharwad-580003
- India
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27
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Gangadhara Reddy K, Madhavi G, Kumara Swamy B. Mobilized lipase enzymatic biosensor for the determination of Chlorfenvinphos and Malathion in contaminated water samples: A voltammetric study. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.06.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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28
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Saha S, Sarkar P, Turner APF. Interference-Free Electrochemical Detection of Nanomolar Dopamine Using Doped Polypyrrole and Silver Nanoparticles. ELECTROANAL 2014. [DOI: 10.1002/elan.201400332] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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29
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Synthesis and characterization of carbon nanoparticles and their modified carbon paste electrode for the determination of dopamine. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2014.02.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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30
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Siddiqui FA, Sher N, Shafi N, Shamshad H, Zubair A. Kinetic and Thermodynamic Spectrophotometric Technique to Estimate Gabapentin in Pharmaceutical Formulations using Ninhydrin. J Anal Sci Technol 2013. [DOI: 10.1186/2093-3371-4-17] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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31
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Reddaiah K, Reddy MM, Raghu P, Reddy TM. An electrochemical sensor based on poly (solochrome dark blue) film coated electrode for the determination of dopamine and simultaneous separation in the presence of uric acid and ascorbic acid: A voltammetric method. Colloids Surf B Biointerfaces 2013; 106:145-50. [DOI: 10.1016/j.colsurfb.2013.01.025] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Accepted: 01/02/2013] [Indexed: 10/27/2022]
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32
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Reddy KG, Madhavi G, Swamy BK, Reddy S, Reddy AB, Madhavi V. Electrochemical investigations of lipase enzyme activity inhibition by methyl parathion pesticide: Voltammetric studies. J Mol Liq 2013. [DOI: 10.1016/j.molliq.2012.12.032] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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33
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Gouda AA, Malah ZA. Development and validation of sensitive spectrophotometric method for determination of two antiepileptics in pharmaceutical formulations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 105:488-496. [PMID: 23352920 DOI: 10.1016/j.saa.2012.12.053] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Revised: 12/02/2012] [Accepted: 12/12/2012] [Indexed: 06/01/2023]
Abstract
Rapid, sensitive and validated spectrophotometric methods for the determination of two antiepileptics (gabapentin (GAB) and pregabalin (PRG)) in pure forms and in pharmaceutical formulations was developed. The method is based on the formation of charge transfer complex between drug and the chromogenic reagents quinalizarin (Quinz) and alizarin red S (ARS) producing charge transfer complexes in methanolic medium which showed an absorption maximum at 571 and 528 nm for GAB and 572 and 538 nm for PRG using Quinz and ARS, respectively. The optimization of the reaction conditions such as the type of solvent, reagent concentration and reaction time were investigated. Beer's law is obeyed in the concentration ranges 0.4-8.0 and 0.5-10 μg mL(-1) for GAB and PRG using Quinz and ARS, respectively. The molar absorptivity, Sandell sensitivity, detection and quantification limits are also calculated. The correlation coefficients were ≥0.9992 with a relative standard deviation (RSD%) of ≤1.76. The methods are successfully applied to the determination of GAB and PRG in pharmaceutical formulations and the validity assesses by applying the standard addition technique, which compared with those obtained using the reported methods.
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Affiliation(s)
- Ayman A Gouda
- Chemistry Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt.
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34
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Ahmar H, Keshipour S, Hosseini H, Fakhari AR, Shaabani A, Bagheri A. Electrocatalytic oxidation of hydrazine at glassy carbon electrode modified with ethylenediamine cellulose immobilized palladium nanoparticles. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2012.11.031] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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35
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Sodium do-decyl benzene sulfate modified carbon paste electrode as an electrochemical sensor for the simultaneous analysis of dopamine, ascorbic acid and uric acid: A voltammetric study. J Mol Liq 2013. [DOI: 10.1016/j.molliq.2012.10.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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36
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Jalali F, Dorraji PS. Electrochemical and spectroscopic studies of the interaction between the neuroleptic drug, gabapentin, and DNA. J Pharm Biomed Anal 2012; 70:598-601. [DOI: 10.1016/j.jpba.2012.06.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Revised: 06/02/2012] [Accepted: 06/05/2012] [Indexed: 10/28/2022]
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37
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Winotapun W, Kongpakwattana K, Dejpittayanunt S, Pathomcharoensukchai S, Suksaran U, Nuntharatanapong N, Rojanarata T. "From safe source to safe sink" development of colorimetric assay for gabapentin in bulk drug and capsules using naturally derived genipin. Talanta 2012; 99:997-1003. [PMID: 22967654 DOI: 10.1016/j.talanta.2012.07.084] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Revised: 07/26/2012] [Accepted: 07/30/2012] [Indexed: 10/28/2022]
Abstract
A novel colorimetric assay for gabapentin in bulk drug and capsules has been developed via a safety-and-sustainability concerning concept. The method relied on the reaction of primary amino group of drug with non-toxic and eco-friendly genipin in totally aqueous medium to form the blue product which was subsequently measured by visible spectrophotometry at 590 nm. Under the optimized conditions, Beer's law was obeyed in the concentration range of 0.15-0.50 mM (r(2)=0.9998). It was accurate, precise and insensitive to the interferences from all related compounds specified in the United States Pharmacopeia as well as commonly used excipients. Furthermore, it gave the assay results in agreement with the pharmacopeial chromatographic method. Owing to the environmental concern and responsibility, a fast and facile method was also proposed for the treatment of waste generated from the assay based on the decoloration by using gypsum as a cheap and commonly available adsorbent. After the treatment, more than 95% of the initial blue product was removed from the waste solution and the treated waste was proven to be safe for aquatic organisms, as studied in brine shrimp and guppy fishes. Therefore, this work not only reports for the first time the application of naturally derived genipin to drug analysis, but also presents a new and contemporary paradigm that illustrates the fully benign-by-design development of the analytical methodologies in the era of Green Chemistry, starting from the safe source of reagents toward the safe sink when waste is released into the environment.
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Affiliation(s)
- Weerapath Winotapun
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Silpakorn University, Nakhon Pathom 73000, Thailand
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38
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Sathisha TV, Swamy BEK, Reddy S, Chandrashekar BN, Eswarappa B. Clay modified carbon paste electrode for the voltammetric detection of dopamine in presence of ascorbic acid. J Mol Liq 2012. [DOI: 10.1016/j.molliq.2012.05.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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39
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Reddaiah K, Madhusudana Reddy T, Raghu P. Electrochemical investigation of L-dopa and simultaneous resolution in the presence of uric acid and ascorbic acid at a poly (methyl orange) film coated electrode: A voltammetric study. J Electroanal Chem (Lausanne) 2012. [DOI: 10.1016/j.jelechem.2012.07.027] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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40
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Electrocatalytic oxidation of tyrosine at poly(threonine)-film modified carbon paste electrode and its voltammetric determination in real samples. J Mol Liq 2012. [DOI: 10.1016/j.molliq.2012.03.022] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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41
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Mahanthesha K, Swamy BK, Chandra U, Shankar SS, Pai K. Electrocatalytic oxidation of dopamine at murexide and TX-100 modified carbon paste electrode: A cyclic voltammetric study. J Mol Liq 2012. [DOI: 10.1016/j.molliq.2012.05.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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42
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Bagheri A, Hosseini H. Electrochemistry of raloxifene on glassy carbon electrode and its determination in pharmaceutical formulations and human plasma. Bioelectrochemistry 2012; 88:164-70. [PMID: 22542469 DOI: 10.1016/j.bioelechem.2012.03.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2011] [Revised: 03/22/2012] [Accepted: 03/26/2012] [Indexed: 11/17/2022]
Abstract
The electrochemical behavior of raloxifene (RLX) on the surface of a glassy carbon electrode (GCE) has been studied by cyclic voltammetry (CV). The CV studies were performed in various supporting electrolytes, wide range of potential scan rates, and pHs. The results showed an adsorption-controlled and quasi-reversible process for the electrochemical reaction of RLX, and a probable redox mechanism was suggested. Under the optimum conditions, differential pulse voltammetry (DPV) was applied for quantitative determination of the RLX in pharmaceutical formulations. The DPV measurements showed that the anodic peak current of the RLX was linear to its concentration in the range of 0.2-50.0μM with a detection limit of 0.0750μM, relative standard deviation (RSD %) below 3.0%, and a good sensitivity. The proposed method was successfully applied for determination of the RLX in pharmaceutical and human plasma samples with a good selectivity and suitable recovery.
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Affiliation(s)
- Akbar Bagheri
- Department of Chemistry, Faculty of Science, Shahid Beheshti University, Evin, Tehran, Iran.
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43
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Electrochemical selective determination of dopamine at TX-100 modified carbon paste electrode: A voltammetric study. J Mol Liq 2012. [DOI: 10.1016/j.molliq.2012.01.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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44
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Raghu P, Kumara Swamy B, Madhusudana Reddy T, Chandrashekar B, Reddaiah K. Sol–gel immobilized biosensor for the detection of organophosphorous pesticides: A voltammetric method. Bioelectrochemistry 2012; 83:19-24. [DOI: 10.1016/j.bioelechem.2011.08.002] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Revised: 08/01/2011] [Accepted: 08/01/2011] [Indexed: 10/17/2022]
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45
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Voltammetric oxidation and determination of loop diuretic furosemide at a multi-walled carbon nanotubes paste electrode. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2011.11.011] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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46
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Development of AChE biosensor for the determination of methyl parathion and monocrotophos in water and fruit samples: A cyclic voltammetric study. J Electroanal Chem (Lausanne) 2012. [DOI: 10.1016/j.jelechem.2011.11.020] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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47
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Yari A, Papi F, Farhadi S. Voltammetric Determination of Trace Antiepileptic Gabapentin with a Silver-Nanoparticle Modified Multiwalled Carbon Nanotube Paste Electrode. ELECTROANAL 2011. [DOI: 10.1002/elan.201100454] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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48
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49
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Thomas T, Mascarenhas RJ, Nethravathi C, Rajamathi M, Kumara Swamy B. Graphite oxide bulk modified carbon paste electrode for the selective detection of dopamine: A voltammetric study. J Electroanal Chem (Lausanne) 2011. [DOI: 10.1016/j.jelechem.2011.05.011] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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50
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Sensitive and selective spectrophotometric determination of gabapentin in capsules using two nitrophenols as chromogenic agents. Int J Anal Chem 2011; 2011:619310. [PMID: 21760787 PMCID: PMC3132512 DOI: 10.1155/2011/619310] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Accepted: 04/20/2011] [Indexed: 11/17/2022] Open
Abstract
Two simple and selective spectrophotometric methods have been proposed for the determination of gabapentin (GBP) in pure form and in capsules. Both methods are based on the proton transfer from the Lewis acid such as 2,4,6-trinitrophenol (picric acid; PA) or 2,4-dinitrophenol (2,4-DNP) to the primary amino group of GBP which works as Lewis base and formation of yellow ion-pair complexes. The ion-pair complexes formed show absorption maximum at 415 and 420 nm for PA and 2,4-DNP, respectively. Under the optimized experimental conditions, Beer's law is obeyed over the concentration ranges of 1.25–15.0 and 2.0–18.0 μg mL−1 GBP for PA and 2,4-DNP methods, respectively. The molar absorptivity, Sandell's sensitivity, detection and, quantification limits for both methods are also reported. The proposed methods were applied successfully to the determination of GBP in pure form and commercial capsules. Statistical comparison of the results was performed using Student's t-test and F-ratio at 95% confidence level, and there was no significant difference between the reference and proposed methods with regard to accuracy and precision. Further, the validity of the proposed methods was confirmed by recovery studies via standard addition technique.
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