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Smarzewska S, Ignaczak A, Koszelska K. Electrochemical and theoretical studies of the interaction between anticancer drug ponatinib and dsDNA. Sci Rep 2024; 14:2278. [PMID: 38280929 PMCID: PMC10821894 DOI: 10.1038/s41598-024-52609-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Accepted: 01/21/2024] [Indexed: 01/29/2024] Open
Abstract
In this study, electrochemical and theoretical studies were performed to explain the interaction mechanism between ponatinib (PNT), a third generation tyrosine kinase inhibitor, and dsDNA. The electrochemical part was conducted in phosphate-buffered saline (PBS) at physiological pH of 7.4 and in acetate buffer with a pH of 4.7, using square wave voltammetry. A boron-doped diamond electrode was used in a bulk-incubated solution. The theoretical part was investigated using computational methods, such as the semiempirical method PM7 and density functional theory (DFT). Significant differences in the electrochemical behavior of PNT in the presence of DNA confirmed the occurrence of interactions. The results obtained in the acetate buffer strongly suggested the preferential interaction of PNT with guanine residues. However, at physiological pH, it can be concluded that PNT interacts with dGua and dAdo in the dsDNA molecule. These results are consistent with outcomes from the theoretical studies, where quantum-chemical calculations showed that both electrochemically detectable nucleobases form hydrogen bonds with the drug. These bonds appeared to be stronger with guanine than with adenine. According to the computational studies, the dsDNA major groove is the energetically preferred site for the complexation of PNT.
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Affiliation(s)
- Sylwia Smarzewska
- Department of Inorganic and Analytical Chemistry, University of Lodz, 12 Tamka Str, 91-403, Lodz, Poland
| | - Anna Ignaczak
- Department of Physical Chemistry, University of Lodz, 163/165 Pomorska Str, 90-236, Lodz, Poland.
| | - Kamila Koszelska
- Department of Inorganic and Analytical Chemistry, University of Lodz, 12 Tamka Str, 91-403, Lodz, Poland.
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Eskiköy Bayraktepe D, Yıldız C, Yazan Z. The development of electrochemical DNA biosensor based on poly-l-methionine and bimetallic AuPt nanoparticles coating: Picomolar detection of Imatinib and Erlotinib. Talanta 2023; 257:124361. [PMID: 36801759 DOI: 10.1016/j.talanta.2023.124361] [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: 12/26/2022] [Revised: 02/09/2023] [Accepted: 02/12/2023] [Indexed: 02/16/2023]
Abstract
We report on the preparation of a new and simple electrochemical DNA biosensor based on DNA/AuPt/p-L-Met coating on a screen-printed carbon electrode (SPE) and its use in the determination of the cancer therapy agents, Imatinib (IMA) and Erlotinib (ERL). Poly-l-methionine (p-L-Met), gold, and platinum nanoparticles (AuPt) were successfully coated by one-step electrodeposition onto the SPE from a solution containing L-Met, HAuCl4, and H2PtCl6. The immobilization of DNA was achieved by drop-casting on the surface of the modified electrode. Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS), Field-Emission Scanning Electron Microscopy (FE-SEM), Energy-Dispersive X-ray Spectroscopy (EDX), and Atomic Force Microscopy (AFM) were used to investigate the morphology, the structure, and the electrochemical performance of the sensor. Experimental factors influencing the coating and DNA immobilization processes were optimized. The peak currents originating from guanine (G) and adenine (A) oxidation of ds-DNA were used as signals to quantify IMA and ERL in the concentration range 2.33-80 nM and 0.032-1.0 nM with the LODs of 0.18 nM and 0.009 nM, respectively. The biosensor developed was suitable for determining IMA and ERL in human serum and pharmaceutical samples.
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Affiliation(s)
| | - Ceren Yıldız
- Ankara University Faculty of Science Department of Chemistry, Ankara, 06560, Turkey
| | - Zehra Yazan
- Ankara University Faculty of Science Department of Chemistry, Ankara, 06560, Turkey.
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Rupar J, Dobričić V, Brborić J, Čudina O, Aleksić MM. Square wave voltammetric study of interaction between 9-acridinyl amino acid derivatives and DNA. Bioelectrochemistry 2022; 149:108323. [DOI: 10.1016/j.bioelechem.2022.108323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 10/27/2022] [Accepted: 11/07/2022] [Indexed: 11/13/2022]
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DNA Electrochemical Biosensors for In Situ Probing of Pharmaceutical Drug Oxidative DNA Damage. SENSORS 2021; 21:s21041125. [PMID: 33562790 PMCID: PMC7915242 DOI: 10.3390/s21041125] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 02/01/2021] [Accepted: 02/01/2021] [Indexed: 12/20/2022]
Abstract
Deoxyribonucleic acid (DNA) electrochemical biosensors are devices that incorporate immobilized DNA as a molecular recognition element on the electrode surface, and enable probing in situ the oxidative DNA damage. A wide range of DNA electrochemical biosensor analytical and biotechnological applications in pharmacology are foreseen, due to their ability to determine in situ and in real-time the DNA interaction mechanisms with pharmaceutical drugs, as well as with their degradation products, redox reaction products, and metabolites, and due to their capacity to achieve quantitative electroanalytical evaluation of the drugs, with high sensitivity, short time of analysis, and low cost. This review presents the design and applications of label-free DNA electrochemical biosensors that use DNA direct electrochemical oxidation to detect oxidative DNA damage. The DNA electrochemical biosensor development, from the viewpoint of electrochemical and atomic force microscopy (AFM) characterization, and the bottom-up immobilization of DNA nanostructures at the electrode surface, are described. Applications of DNA electrochemical biosensors that enable the label-free detection of DNA interactions with pharmaceutical compounds, such as acridine derivatives, alkaloids, alkylating agents, alkylphosphocholines, antibiotics, antimetabolites, kinase inhibitors, immunomodulatory agents, metal complexes, nucleoside analogs, and phenolic compounds, which can be used in drug analysis and drug discovery, and may lead to future screening systems, are reviewed.
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Gajski G, Gerić M, Domijan AM, Golubović I, Garaj-Vrhovac V. Evaluation of oxidative stress responses in human circulating blood cells after imatinib mesylate treatment - Implications to its mechanism of action. Saudi Pharm J 2019; 27:1216-1221. [PMID: 31885482 PMCID: PMC6921178 DOI: 10.1016/j.jsps.2019.10.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 10/19/2019] [Indexed: 02/02/2023] Open
Abstract
Imatinib mesylate (IM) is the first developed protein kinase inhibitor and recently it has topped consumption rates among targeted and total anticancer drugs. Although there are indications that IM possesses cyto/genotoxic activities against normal non-target cells as well, there is a lack of information regarding the underlying mechanism involved in those actions. Therefore, we aimed to evaluate the response of human circulating blood cells towards oxidative stress after IM treatment (0.0001–10 µg/mL) in vitro. Based on the results, IM had an influence on all of the oxidative stress parameters tested. Lower concentrations of IM induced an increase of glutathione level, following its decrease at higher IM concentrations indicating impairment in oxidative stress defences. Concomitant to a glutathione decrease, an increase of malondialdehyde and protein carbonyls level was observed indicating oxidative damage of lipids and proteins. The observed effects overlapped with the observed formation of oxidative base damage detected by formamidopyrimidine-DNA glycosylase modified-comet assay indicating that IM managed to induce oxidative DNA damage. Our results provide novelty in their mechanistic approach to IM-induced toxicity in non-target cells and suggest that IM can affect blood cells and induce oxidative stress.
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Affiliation(s)
- Goran Gajski
- Institute for Medical Research and Occupational Health, Mutagenesis Unit, 10000 Zagreb, Croatia
- Corresponding author at: Institute for Medical Research and Occupational Health, Mutagenesis Unit, Ksaverska cesta 2, 10000 Zagreb, Croatia.
| | - Marko Gerić
- Institute for Medical Research and Occupational Health, Mutagenesis Unit, 10000 Zagreb, Croatia
| | - Ana-Marija Domijan
- University of Zagreb, Faculty of Pharmacy and Biochemistry, 10000 Zagreb, Croatia
| | - Ivana Golubović
- University of Zagreb, Faculty of Pharmacy and Biochemistry, 10000 Zagreb, Croatia
| | - Vera Garaj-Vrhovac
- Institute for Medical Research and Occupational Health, Mutagenesis Unit, 10000 Zagreb, Croatia
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Oancea IA, van Staden J(KF, Oancea E, Ungureanu EM. Electrochemical detection of ursolic acid from spruce ( Picea abies) essential oils using modified amperometric microsensors. ANAL LETT 2019. [DOI: 10.1080/00032719.2019.1605373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Ioana Adina Oancea
- Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Politehnica University of Bucharest, Bucharest, Romania
- SC. Dan-Elis. SRL, Cosmetic Product Manufacturing, Topraisar, Romania
- Laboratory of Electrochemistry and PATLAB Bucharest, National Institute of Research for Electrochemistry and Condensed Matter, Bucharest, Romania
| | - Jacobus (Koos) Frederick van Staden
- Laboratory of Electrochemistry and PATLAB Bucharest, National Institute of Research for Electrochemistry and Condensed Matter, Bucharest, Romania
| | - Elena Oancea
- SC. Dan-Elis. SRL, Cosmetic Product Manufacturing, Topraisar, Romania
| | - Eleonora-Mihaela Ungureanu
- Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Politehnica University of Bucharest, Bucharest, Romania
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Banasiak A, Cassidy J, Colleran J. A novel quantitative electrochemical method to monitor DNA double-strand breaks caused by a DNA cleavage agent at a DNA sensor. Biosens Bioelectron 2018; 117:217-223. [PMID: 29906769 DOI: 10.1016/j.bios.2018.05.058] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 05/22/2018] [Accepted: 05/31/2018] [Indexed: 12/12/2022]
Abstract
To date, DNA cleavage, caused by cleavage agents, has been monitored mainly by gel and capillary electrophoresis. However, these techniques are time-consuming, non-quantitative and require gel stains. In this work, a novel, simple and, importantly, a quantitative method for monitoring the DNA nuclease activity of potential anti-cancer drugs, at a DNA electrochemical sensor, is presented. The DNA sensors were prepared using thiol-modified oligonucleotides that self-assembled to create a DNA monolayer at gold electrode surfaces. The quantification of DNA double-strand breaks is based on calculating the DNA surface coverage, before and after exposure to a DNA cleavage agent. The nuclease properties of a model DNA cleavage agent, copper bis-phenanthroline ([CuII(phen)2]2+), that can cleave DNA in a Fenton-type reaction, were quantified electrochemically. The DNA surface coverage decreased on average by 21% after subjecting the DNA sensor to a nuclease assay containing [CuII(phen)2]2+, a reductant and an oxidant. This percentage indicates that 6 base pairs were cleaved in the nuclease assay from the immobilised 30 base pair strands. The DNA cleavage can be also induced electrochemically in the absence of a chemical reductant. [CuII(phen)2]2+ intercalates between DNA base pairs and, on application of a suitable potential, can be reduced to [CuI(phen)2]+, with dissolved oxygen acting as the required oxidant. This reduction process is facilitated through DNA strands via long-range electron transfer, resulting in DNA cleavage of 23%. The control measurements for both chemically and electrochemically induced cleavage revealed that DNA strand breaks did not occur under experimental conditions in the absence of [CuII(phen)2]2+.
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Affiliation(s)
- Anna Banasiak
- Applied Electrochemistry Group, Dublin Institute of Technology, FOCAS Institute, Camden Row, Dublin 8, Ireland
| | - John Cassidy
- Applied Electrochemistry Group, Dublin Institute of Technology, FOCAS Institute, Camden Row, Dublin 8, Ireland; School of Chemical and Pharmaceutical Sciences, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland
| | - John Colleran
- Applied Electrochemistry Group, Dublin Institute of Technology, FOCAS Institute, Camden Row, Dublin 8, Ireland; School of Chemical and Pharmaceutical Sciences, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland.
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Chiorcea-Paquim AM, Oliveira SCB, Diculescu VC, Oliveira-Brett AM. Applications of DNA-Electrochemical Biosensors in Cancer Research. PAST, PRESENT AND FUTURE CHALLENGES OF BIOSENSORS AND BIOANALYTICAL TOOLS IN ANALYTICAL CHEMISTRY: A TRIBUTE TO PROFESSOR MARCO MASCINI 2017. [DOI: 10.1016/bs.coac.2017.06.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/06/2022]
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Kurbanoglu S, Dogan-Topal B, Rodriguez EP, Bozal-Palabiyik B, Ozkan SA, Uslu B. Advances in electrochemical DNA biosensors and their interaction mechanism with pharmaceuticals. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2016.05.022] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Diculescu VC, Chiorcea-Paquim AM, Oliveira-Brett AM. Applications of a DNA-electrochemical biosensor. Trends Analyt Chem 2016. [DOI: 10.1016/j.trac.2016.01.019] [Citation(s) in RCA: 119] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Diculescu VC, Oliveira-Brett AM. In situ electrochemical evaluation of dsDNA interaction with the anticancer drug danusertib nitrenium radical product using the DNA-electrochemical biosensor. Bioelectrochemistry 2015; 107:50-7. [PMID: 26523506 DOI: 10.1016/j.bioelechem.2015.10.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 09/22/2015] [Accepted: 10/23/2015] [Indexed: 10/22/2022]
Abstract
Danusertib is a kinase inhibitor and anti-cancer drug. The evaluation of the interaction between danusertib and dsDNA was investigated in bulk solution and using the dsDNA-electrochemical biosensor. The dsDNA-danusertib interaction occurs in two sequential steps. First, danusertib binds electrostatically todsDNA phosphate backbone through the positively charged piperazine moiety. The second step involved the pyrrolo-pyrazolemoiety and led to small morphological modifications in the dsDNA double helix which were electrochemically characterised through the changes of guanine and adenine residue oxidation peaks and confirmed by electrophoretic and spectrophotometric measurements. The nitrenium cation radical product of danusertib amino group oxidation was electrochemically generated in situ on the dsDNA-electrochemical biosensor surface. The danusertib nitrenium cation radical redox metabolite was covalently attached to the C8 of guanine residues preventing their oxidation. An interaction mechanism of dsDNA-danusertib is proposed and the formation of the danusertib redox nitrenium radical metabolite-guanine adduct explained.
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Affiliation(s)
- Victor Constantin Diculescu
- Chemistry Department, Faculty of Sciences and Technology, University of Coimbra, 3004-535, Coimbra, Portugal
| | - Ana Maria Oliveira-Brett
- Chemistry Department, Faculty of Sciences and Technology, University of Coimbra, 3004-535, Coimbra, Portugal.
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Zhang D, Yin R, Liu Y, Li X, Zhou F, Ji B. Development of a Differential Pulse Voltammetric (DPV) Assay for Assessing the Hypochlorite Scavenging Capacity of Pure Compounds and Beverages. FOOD ANAL METHOD 2015. [DOI: 10.1007/s12161-015-0115-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Pisoschi AM, Cimpeanu C, Predoi G. Electrochemical Methods for Total Antioxidant Capacity and its Main Contributors Determination: A review. OPEN CHEM 2015. [DOI: 10.1515/chem-2015-0099] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
AbstractBackround: The present review focuses on electrochemical methods for antioxidant capacity and its main contributors assessment. The main reactive oxygen species, responsible for low density lipoprotein oxidation, and their reactivity are reminded. The role of antioxidants in counteracting the factors leading to oxidative stress-related degenerative diseases occurence, is then discussed. Antioxidants can scavenge free radicals, can chelate pro-oxidative metal ions, or quench singlet oxygen. When endogenous factors (uric acid, bilirubin, albumin, metallothioneins, superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase, glutathione-S-transferase) cannot accomplish their protective role against reactive oxygen species, the intervention of exogenous antioxidants (vitamin C, tocopherols, flavonoids, carotenoids etc) is required, as intake from food, as nutritional supplements or as pharmaceutical products.Literature study: The main advantages of electrochemical methods with respect to traditional, more laborious instrumental techniques are described: sensitivity, rapidity, simplicity of the applied analytical procedure which does not require complicated sample pre-treatment etc.The paper reviews minutiously the voltammetric, amperometric, biamperometric, potentiometric and coulometric methods for total antioxidant capacity estimation. For each method presented, the electroactivity and the mechanism of electro-oxidation of antioxidant molecules at various electrodes, as well as the influences on the electroactive properties are discussed. The characteristics of the developed methods are viewed from the perspective of the antioxidant molecule structure influence, as well as from the importance of electrode material and/or surface groups standpoint.The antioxidant molecule-electrode surface interaction, the detection system chosen, the use of modifiers, as well as the nature of the analysed matrix are the factors discussed, which influence the performances of the studied electrochemical techniques.Conclusions: The electrochemical methods reviewed in this paper allow the successful determination of the total antioxidant capacity and of its main contributors in various media: foodstuffs and beverages, biological fluids, pharmaceuticals. The advantages and disadvantages of the electrochemical methods applied to antioxidant content and antioxidant activity assay are treated and interpreted, in the case of various analysed matrixes. Combining advanced materials with classical electrode construction, provides viable results and can constitute an alternative for the future.
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Buoro RM, Lopes IC, Diculescu VC, Serrano SHP, Lemos L, Oliveira-Brett AM. In situ evaluation of gemcitabine-DNA interaction using a DNA-electrochemical biosensor. Bioelectrochemistry 2014; 99:40-5. [PMID: 24984198 DOI: 10.1016/j.bioelechem.2014.05.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 05/09/2014] [Accepted: 05/30/2014] [Indexed: 10/25/2022]
Abstract
The electrochemical behaviour of the cytosine nucleoside analogue and anti-cancer drug gemcitabine (GEM) was investigated at glassy carbon electrode, using cyclic, differential pulse and square wave voltammetry, in different pH supporting electrolytes, and no electrochemical redox process was observed. The evaluation of the interaction between GEM and DNA in incubated solutions and using the DNA-electrochemical biosensor was studied. The DNA structural modifications and damage were electrochemically detected following the changes in the oxidation peaks of guanosine and adenosine residues and the occurrence of the free guanine residues electrochemical signal. The DNA-GEM interaction mechanism occurred in two sequential steps. The initial process was independent of the DNA sequence and led to the condensation/aggregation of the DNA strands, producing rigid structures, which favoured a second step, in which the guanine hydrogen atoms, participating in the C-G base pair, interacted with the GEM ribose moiety fluorine atoms.
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Affiliation(s)
- Rafael M Buoro
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004-535 Coimbra, Portugal; Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05508-000 São Paulo, Brazil
| | - Ilanna C Lopes
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - Victor C Diculescu
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - Silvia H P Serrano
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05508-000 São Paulo, Brazil
| | - Liseta Lemos
- Serviços Farmacêuticos, Centro Hospitalar e Universitário de Coimbra (CHUC), 3000-075 Coimbra, Portugal
| | - Ana Maria Oliveira-Brett
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004-535 Coimbra, Portugal.
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Popa OM, Diculescu VC. Electrochemical and spectrophotometric characterisation of protein kinase inhibitor and anticancer drug danusertib. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.09.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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16
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Electrochemical biosensors for the monitoring of DNA damage induced by ferric ions mediated oxidation of dopamine. Electrochem commun 2013. [DOI: 10.1016/j.elecom.2012.12.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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Golea DA, Diculescu VC, Tugulea L, Oliveira Brett AM. Proteasome Inhibitor Anticancer Drug Bortezomib Redox Behaviour at a Glassy Carbon Electrode. ELECTROANAL 2012. [DOI: 10.1002/elan.201200307] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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19
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Comparative study on the electrocatalytic activities of ordered mesoporous carbons and graphene. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2010.12.099] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Liu Y, Hu N. Electrochemical detection of natural DNA damage induced by ferritin/ascobic acid/H2O2 system and amplification of DNA damage by endonuclease Fpg. Biosens Bioelectron 2009; 25:185-90. [DOI: 10.1016/j.bios.2009.06.035] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2009] [Revised: 06/09/2009] [Accepted: 06/23/2009] [Indexed: 11/26/2022]
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21
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Diculescu VC, Chiorcea-Paquim AM, Tugulea L, Vivan M, Oliveira-Brett AM. Interaction of imatinib with liposomes: Voltammetric and AFM characterization. Bioelectrochemistry 2009; 74:278-88. [DOI: 10.1016/j.bioelechem.2008.10.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2008] [Revised: 10/15/2008] [Accepted: 10/15/2008] [Indexed: 12/18/2022]
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Determination of Vitamin C (Ascorbic Acid) Using High Performance Liquid Chromatography Coupled with Electrochemical Detection. SENSORS 2008; 8:7097-7112. [PMID: 27873917 PMCID: PMC3787433 DOI: 10.3390/s8117097] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2008] [Revised: 11/04/2008] [Accepted: 11/06/2008] [Indexed: 11/16/2022]
Abstract
Vitamin C (ascorbic acid, ascorbate, AA) is a water soluble organic compound that participates in many biological processes. The main aim of this paper was to utilize two electrochemical detectors (amperometric - Coulouchem III and coulometric - CoulArray) coupled with flow injection analysis for the detection of ascorbic acid. Primarily, we optimized the experimental conditions. The optimized conditions were as follows: detector potential 100 mV, temperature 25 °C, mobile phase 0.09% TFA:ACN, 3:97 (v/v) and flow rate 0.13 mL·min-1. The tangents of the calibration curves were 0.3788 for the coulometric method and 0.0136 for the amperometric one. The tangent of the calibration curve measured by the coulometric detector was almost 30 times higher than the tangent measured by the amperometric detector. Consequently, we coupled a CoulArray electrochemical detector with high performance liquid chromatography and estimated the detection limit for AA as 90 nM (450 fmol per 5 μL injection). The method was used for the determination of vitamin C in a pharmaceutical preparations (98 ± 2 mg per tablet), in oranges (Citrus aurantium) (varied from 30 to 56 mg/100 g fresh weight), in apples (Malus sp.) (varied from 11 to 19 mg/100 g fresh weight), and in human blood serum (varied from 38 to 78 μM). The recoveries were also determined.
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Zhang Y, Zhang H, Hu N. Using exonuclease III to enhance electrochemical detection of natural DNA damage in layered films. Biosens Bioelectron 2008; 23:1077-82. [DOI: 10.1016/j.bios.2007.10.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2007] [Revised: 09/30/2007] [Accepted: 10/23/2007] [Indexed: 10/22/2022]
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