Ana Chira
CS - Centrul de Bioanaliză
Biografie
Am obtinut titlul de doctor în Chimie-Științe Exacte la Universitatea Politehnica din Bucuresti, in anul 2014. Mi-am desfăşurat activitatea de cercetare, dezvoltare experimentală și inovare pe diverse domenii aplicative, participând ca membru al echipei în peste 25 de proiecte din Programe Naționale și Europene.
Expertiza mea se concentrează pe dezvoltarea și caracterizarea suprafețelor modificate prin tehnici electrochimice, dezvoltarea de senzori și biosenzori pentru analize de mediu și alimente, evaluarea comportamentului materialelor la coroziune prin metode electrochimice și spectroscopia de impedanță electrochimică (EIS). De asemenea, am realizat și caracterizat fitonutrienți obținuți din surse vegetale pentru îmbunatatirea eficienței nutriționale a fito-produselor.
Publicatii
Publication | Authors | Date | |
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article
N-Doped Nanocrystalline Graphite Electrochemical Sensor For Oleuropein Detection From Extra Virgin Olive Oils |
Albu Camelia; Chira Ana; Stoica Alice; Radu Gabriel-Lucian; Radoi Antonio; Stoian Marius; Simionescu Octavian-Gabriel; Eremia Sandra A. V. | Chemosensors, 2024 | |
RezumatA nitrogen-doped nanocrystalline electrochemical graphite sensor for the sensitive determination of oleuropein (OL) from extra virgin olive oils (EVOOs) is presented. The sensor was developed by the deposition of nanocrystalline graphite (NCG) using plasma-enhanced chemical vapour deposition (PECVD) on silicon wafers. Scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction analysis (XRD) were used to characterise the microstructure and morphology of the developed materials. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and square wave voltammetry (SWV) were used to investigate the electrochemical properties of the material and the performance of the sensor. The developed sensor showed good analytical performance against OL over a concentration range of 5.00-500.00 mu M, with a good detection limit of 3.93 mu M and a good sensitivity of 0.057 mu A mu M-1. The reproducibility of the electrochemical sensor was excellent, with a relative standard deviation (RSD) of 8.56% for seven measurements. |
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article
Investigation Of The Corrosion Inhibition Properties Of New Phenyl Aldehyde Organic Layers Functionalized With Different Amino Alcohols Electrodeposited On Copper |
Chira Ana; Bucur Bogdan; Radu Gabriel-Lucian | Comptes Rendus Chimie, 2021 | |
RezumatPhenyl aldehyde layers were formed on copper foils by electro-assisted diazonium reactions and subsequently functionalized with either amino-2-propanol or 2-amino-1-butanol. The anticorrosion properties of the two obtained organic films 2-[(phenylmethylidene)amino]butan-1-ol and (phenylmethylidene)amino-propan-2-ol were evaluated in aerated buffer acetate solution pH = 3.5. The electrochemical corrosion inhibition properties were investigated after different immersion times using electrochemical impedance spectroscopy and potentiodynamic polarization analysis (Tafel). Contact angle measurement confirms the hydrophobic nature of the new organic coatings and layer stability after immersion in buffer. The results showed that both developed layers provided good anticorrosion protection and the highest inhibition was achieved using 2-[(phenylmethylidene)amino]butan-1-ol coating on copper, which makes it a useful device for anticorrosion protection. Moreover, correlations between the molecular structures of the corrosion inhibitors and their protecting efficiencies have been established. |
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article
Investigation Of The Corrosion Inhibition Properties Of New Phenyl Aldehyde Organic Layers Functionalized With Different Amino Alcohols Electrodeposited On Copper [Etude Des Propriétés D'Inhibition De La Corrosion Par De Nouvelles Couches Organiques De Phénylaldéhyde Fonctionnaliseés Avec Différents Amino-Alcools Électrodéposés Sur Cuivre] |
Chira A.; Bucur B.; Radu G.-L. | Comptes Rendus Chimie, 2021 | |
RezumatPhenyl aldehyde layers were formed on copper foils by electro-assisted diazonium reactions and subsequently functionalized with either amino-2-propanol or 2-amino-1-butanol. The anticorrosion properties of the two obtained organic films 2-[(phenylmethylidene)amino]butan-1-ol and (phenylmethylidene)amino-propan-2-ol were evaluated in aerated buffer acetate solution pH Æ 3.5. The electrochemical corrosion inhibition properties were investigated after different immersion times using electrochemical impedance spectroscopy and potentiodynamic polarization analysis (Tafel). Contact angle measurement confirms the hydrophobic nature of the new organic coatings and layer stability after immersion in buffer. The results showed that both developed layers provided good anticorrosion protection and the highest inhibition was achieved using 2-[(phenylmethylidene)amino]butan-1-ol coating on copper, which makes it a useful device for anticorrosion protection.Moreover, correlations between the molecular structures of the corrosion inhibitors and their protecting efficiencies have been established. © 2021 Elsevier Masson SAS. All rights reserved. |
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conference
Electrode-Modified With Nanoparticles Composed Of 4,4′-Bipyridine-Silver Coordination Polymer For Sensitive Determination Of Hg(Ii), Cu(Ii) And Pb(Ii) |
A. Chira; B. Bucur; M. P. Bucur; G. L. Radu | 8Th International Workshop On Surface Modification For Chemical And Biochemical Sensing – Smcbs,Zelechów, Poland, 2017 | |
Rezumat |
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article
Electrodeposited Organic Layers Formed From Aryl Diazonium Salts For Inhibition Of Copper Corrosion |
Chira Ana; Bucur Bogdan; Radu Gabriel-Lucian | Materials, 2017 | |
RezumatCopper substrates deposed on a gold screen-printed electrodewere coveredwith different aryl diazonium salts by electrodeposition at 0.25 mA for 30 or 300 s. Seven compounds were investigated: 4-aminophenylacetic acid, 4-aminophenethyl alcohol, 4-fluoroaniline, 4-(heptadecafluorooctyl) aniline, 4-aminoantipyrine, 4-(4-aminophenyl) butyric acid and 3,4,5-trimethoxyaniline. Quantitative monitoring of the electrodeposition process was carried out by electrogravimetry using quartz crystal microbalance (QCM). The electrodeposited mass varies between 26 ng/cm(2) for 4-fluoroaniline formed during 30 s to 442 ng/cm(2) for 4-phenylbutyric acid formed during 300 s. The corrosion inhibition properties of aryl-modified layers have been studied in buffer citrate with pH = 3 or 3.5% NaCl solutions using electrochemical noise (ECN) and Tafel potentiodynamic polarization measurements. A corrosion inhibiting efficiency up to 90% was found. The highest corrosion inhibition was obtained for 4-(4-aminophenyl) butyric acid and the lowest for 4-fluoroaniline. A relation between the inhibition efficiency and the chemical nature of the substituents in the protective layer was found. |
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conference
Polyphenols, Radical Scavenger Activity, Short-Chain Organic Acids And Heavy Metals Of Several Plants Extracts |
Teodor E.D.; Lițescu S.C.; Albu C.; Rădulescu C.M.; Chira A.; Gatea F.; Radu G.L. | Inaugurarea Centrului Internațional De Studii Avansate Pentru Sisteme Fluvii-Mări „Danubius-Ri” , Murighiol, Tulcea, 2015 | |
Rezumat |
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article
Polyphenols, Radical Scavenger Activity, Short-Chain Organic Acids And Heavy Metals Of Several Plants Extracts From Bucharest Delta |
Teodor Eugenia Dumitra; Gatea Florentina; Albu Camelia; Radulescu Cristina Maria; Chira Ana; Radu Gabriel Lucian | Chemical Papers, 2015 | |
RezumatSome plants collected (Mentha aquatica, Bidens tripartita and Ambrosia artemisiifolia) from an unusual habitat developed in recent years in Bucharest (the so-called Bucharest Delta) and the contents of polyphenolic compounds, short-chain organic acids and heavy metals, and radical scavenger activity, were determined. 12 polyphenolic compounds and 7 short-chain organic acids were quantified using high-performance liquid chromatography and capillary electrophoresis; Mentha aq. extracts presented the highest levels of rosmarinic acid (1.58 mg g(-1)) and ferulic acid (2.84 mg g(-1)) and Bidens extracts presented the highest concentrations of chlorogenic acid (0.44 mg g(-1)); the same extracts contain the most important levels of luteolin (0.52 mg g(-1)) or other flavonoids. All the heavy metals detected in the plants studied were found in very low levels (the highest was Pb(II) in Mentha aquatica, (12.84 +/- 0.48) mu g kg(-1)). The study sought to identify the active compounds and some contaminants in plants collected from the Bucharest Delta with the intention of eventual exploitation of the habitat and to enhance the knowledge of such human-modified ecosystems. (C) 2015 Institute of Chemistry, Slovak Academy of Sciences |
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article
Study Of The Synthesis And Environmental Removal Of 4,4 '-Dipyridine Derivatives |
Chira Ana; Bucur Bogdan; Galaon Toma; Radu Gabriel-Lucian | Environmental Engineering And Management Journal, 2015 | |
RezumatDipyridine derivatives are used on large scale and pose significant environmental problems. We have synthesized dipyridine derivatives with: 5-chlorovaleric acid, alpha-dichlorhidrin, iodoacetamide and 11-bromoundecanoic acid. The synthesized substituted compounds were investigated by LC-MS. The adsorptive removal of dipyridine derivatives from aqueous solution has been studied using medicinal activated carbon. The adsorption rate has been investigated under the controlled process parameters including adsorption time, carbon and organic compound concentration. The results from this study demonstrated that the activated carbon can be used as a low-cost adsorbent for the removal of environmental cationic dipyridine derivatives from the water environment. |
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article
Polyphenols, Radical Scavenger Activity, Short-Chain Organic Acids And Heavy Metals Of Several Plants Extracts From "Bucharest Delta" |
Teodor E.D.; Gatea F.; Albu C.; Radulescu C.M.; Chira A.; Radu G.L. | Chemical Papers, 2015 | |
RezumatSome plants collected (Mentha aquatica, Bidens tripartita and Ambrosia artemisiifolia) from an unusual habitat developed in recent years in Bucharest (the so-called "Bucharest Delta") and the contents of polyphenolic compounds, short-chain organic acids and heavy metals, and radical scavenger activity, were determined. 12 polyphenolic compounds and 7 short-chain organic acids were quantified using high-performance liquid chromatography and capillary electrophoresis; Mentha aq. extracts presented the highest levels of rosmarinic acid (1.58 mg g-1) and ferulic acid (2.84 mg g-1) and Bidens extracts presented the highest concentrations of chlorogenic acid (0.44 mg g-1); the same extracts contain the most important levels of luteolin (0.52 mg g-1) or other flavonoids. All the heavy metals detected in the plants studied were found in very low levels (the highest was Pb(II) in Mentha aquatica, (12.84 ± 0.48) μg kg-1). The study sought to identify the active compounds and some contaminants in plants collected from the "Bucharest Delta" with the intention of eventual exploitation of the habitat and to enhance the knowledge of such human-modified ecosystems. © 2015 Institute of Chemistry, Slovak Academy of Sciences. |
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article
Study Of The Synthesis And Environmental Removal Of 4,4′-Dipyridine Derivatives |
Chira Ana; Bucur Bogdan; Galaon Toma; Radu Gabriel-Lucian | Environmental Engineering And Management Journal, 2015 | |
RezumatDipyridine derivatives are used on large scale and pose significant environmental problems. We have synthesized dipyridine derivatives with: 5-chlorovaleric acid, alpha-dichlorhidrin, iodoacetamide and 11-bromoundecanoic acid. The synthesized substituted compounds were investigated by LC-MS. The adsorptive removal of dipyridine derivatives from aqueous solution has been studied using medicinal activated carbon. The adsorption rate has been investigated under the controlled process parameters including adsorption time, carbon and organic compound concentration. The results from this study demonstrated that the activated carbon can be used as a low-cost adsorbent for the removal of environmental cationic dipyridine derivatives from the water environment. |
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conference
Electrochemically Modified Electrodes With Synthesized 4.4’-Bipyridine Derivatives |
Chira A.; Bucur B.; Radulescu M.C.; Radu G.L. | French-Romanian Meeting In The Frame Of Third Edition Of International Conferences On Analytical And Nanoanalytical Methods For Biomedical And Environmental Sciences, Brasov, Romania, 2014 | |
Rezumat |
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conference
Polyphenols, Radical Scavenger Activity, Short-Chain Organic Acids And Contaminants From Several Plants Extracts From `Bucharest Delta |
Teodor E.D.; Albu C.; Gatea F.; Rădulescu C.M.; Chira A.; Radu G.L. | Pse Meeting – Phytochemicals In Medicine And Pharmacognosy, Piatra Neamt, Romania, 2014 | |
Rezumat |
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article
Electrode-Modified With Nanoparticles Composed Of 4,4 '-Bipyridine-Silver Coordination Polymer For Sensitive Determination Of Hg(Ii), Cu(Ii) And Pb(Ii) |
Chira Ana; Bucur Bogdan; Bucur Madalina Petruta; Radu Gabriel Lucian | New Journal Of Chemistry, 2014 | |
RezumatWe have modified a glassy carbon electrode (GCE) with nanoparticles composed of a 4,4'-bipyridinesilver coordination polymer (CP) and showed that this CP can be applied to the sensitive differential pulse voltammetric analysis of the ions Hg(II), Cu(II) and Pb(II). The coordination polymer was prepared by mixing a solution of silver nitrate and 4,4'-bipyridine at room temperature. The surface of the GCE was modified with an organic layer of synthesized 1-[(4-nitrophenyl)methyl]-4,4'-bipyridinium and silver ions, which caused the binding of the added Ag-bipy CP. Anodic (oxidative) peaks of the electrode were at +300 mV for Hg(II), -70 mV for Cu(II), and at -540 mV for Pb(II) [versus Ag/AgCl]. Under optimal conditions, calibration graphs were linear in concentration ranges from 0.2 to 10 mu g L-1 for Hg(II), from 1.3 to 6.4 mu g L-1 for Cu(II), and from 4.1 to 20.7 mu g L-1 for Pb(II). The respective detection limits were 0.09 mu g L-1 Hg(II), 0.71 mu g L-1 Cu(II) and 2.3 mu g L-1 Pb(II). Relative standard deviation was 3.2% at a level of 4 mu g L of Hg(II) for n = 10. The modified electrode was applied to the analysis of Hg(II) in spiked fish samples, and of Cu(II), Pb(II), and Hg(II) in spiked plant samples, and recoveries ranged from 90 to 108%. This is the first paper that presents the use of 4,4'-bipyridine-silver coordination polymer for heavy metal electrochemical detection. |
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article
Detection Of Glycoalkaloids Using Disposable Biosensors Based On Genetically Modified Enzymes |
Arredondo Espinoza Michelle; Istamboulie Georges; Chira Ana; Noguer Thierry; Stoytcheva Margarita; Marty Jean-Louis | Analytical Biochemistry, 2014 | |
RezumatIn this work we present a rapid, selective, and highly sensitive detection of a-solanine and a-chaconine using cholinesterase-based sensors. The high sensitivity of the devices is brought by the use of a genetically modified acetylcholinesterase (AChE), combined with a one-step detection method based on the measurement of inhibition slope. The selectivity was obtained by using butyrylcholinesterase (BChE), an enzyme able to detect these two toxins with differential inhibition kinetics. The enzymes were immobilized via entrapment in PVA-AWP polymer directly on the working electrode surface. The analysis of the resulting inhibition slope was performed employing linear regression function included in Matlab. The high toxicity of a-chaconine compared to a-solanine due to a better affinity to the active site was proved. The inhibition of glycoalkaloids (GAs) mixture was performed over AChE enzyme wild-type AChE and BChE biosensors resulting in the detection of synergism effect. The developed method allows the detection of (GAs) at 50 ppb in potato matrix. (C) 2014 Elsevier Inc. All rights reserved. |
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article
Modulating Indium Doped Tin Oxide Electrode Properties For Laccase Electron Transfer Enhancement |
Diaconu Mirela; Chira Ana; Radu Lucian | Thin Solid Films, 2014 | |
RezumatIndium doped tin oxide (ITO) electrodes were functionalized with gold nanoparticles (GNPs) and cysteamine monolayer to enhance the heterogeneous electron transfer process of laccase from Trametes versicolor. The assembly of GNP on ITO support was performed through generation of H+ species at the electrode surface by hydroquinone electrooxidation at 0.9 V vs Ag/AgCl. Uniform distribution of gold nanoparticle aggregates on electrode surfaces was confirmed by atomic force microscopy. The size of GNP aggregates was in the range of 200-500 nm. The enhanced charge transfer at the GNP functionalized ITO electrodes was observed by cyclic voltammetry (CV) and electrochemical impedance spectroscopy. Electrocatalytic behavior of laccase immobilized on ITO modified electrode toward oxygen reduction reaction was evaluated using CV in the presence of 2,2'-azino-bis 3-ethylbenzothiazoline-6-sulfuric acid (ABTS). The obtained sigmoidal-shaped voltammograms for ABTS reduction in oxygen saturated buffer solution are characteristic for a catalytic process. The intensity of catalytic current increased linearly with mediator concentration up to 6.2 x 10(-4) M. The registered voltammogram in the absence of ABTS mediator clearly showed a significant faradaic current which is the evidence of the interfacial oxygen reduction. (C) 2014 Elsevier B.V. All rights reserved. |
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article
Study Of Electrochemically Modified Electrode With Synthesized N-Benzyl-4,4 '-Bipyridine With Anti-Fouling Properties For Oxygen And Hydrogen Peroxide Detection |
Chira Ana; Bucur Bogdan; Radulescu Maria-Cristina; Galaon Toma; Radu Gabriel-Lucian | International Journal Of Electrochemical Science, 2014 | |
Rezumat1-[(4-nitrophenyl) methyl]-4,4'-bipyridinium (N-PMB) was synthesized by refluxing 4,4'-bipyridine and 4-nitrobenzylchloride. A stable film of 1-phenylmethyl-4,4'-bipyridine (PMB) was successfully electrografted on glassy carbon electrodes by the reduction of the diazonium moieties generated in situ. High antifouling ability was obtained for the PMB modified electrode which makes it a useful sensor device for environmental waters monitoring. The modified electrode was used as an amperometric sensor for mediated hydrogen peroxide detection at -0.5 V. The calibration curve was linear from 5 to 60 mu M H2O2 (R-2=0.9978, n=7) with a detection limit of 0.25 mu M. PMB modified electrodes was able to detect oxygen in river water with good sensitivity, selectivity and reproducibility. |
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article
Study Of Electrochemically Modified Electrode With Synthesized N-Benzyl-4,4'-Bipyridine With Anti-Fouling Properties For Oxygen And Hydrogen Peroxide Detection |
Chira A.; Bucur B.; Radulescu M.-C.; Galaon T.; Radu G.-L. | International Journal Of Electrochemical Science, 2014 | |
Rezumat1-[(4-nitrophenyl)methyl]-4,4'-bipyridinium (N-PMB) was synthesized by refluxing 4,4'-bipyridine and 4-nitrobenzylchloride. A stable film of 1-phenylmethyl-4,4'-bipyridine (PMB) was successfully electrografted on glassy carbon electrodes by the reduction of the diazonium moieties generated in situ. High antifouling ability was obtained for the PMB modified electrode which makes it a useful sensor device for environmental waters monitoring. The modified electrode was used as an amperometric sensor for mediated hydrogen peroxide detection at -0.5 V. The calibration curve was linear from 5 to 60 μM H2O2 (R2=0.9978, n=7) with a detection limit of 0.25 μM. PMB modified electrodes was able to detect oxygen in river water with good sensitivity, selectivity and reproducibility. © 2014 The Authors. Published by ESG. |
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article
Study Of Electrochemically Modified Electrode With Synthesized N-Benzyl-4,4′-Bipyridine With Anti-Fouling Properties For Oxygen And Hydrogen Peroxide Detection |
Chira Ana; Bucur Bogdan; Radulescu Maria-Cristina; Galaon Toma; Radu Gabriel-Lucian | International Journal Of Electrochemical Science, 2014 | |
Rezumat1-[(4-nitrophenyl) methyl]-4,4'-bipyridinium (N-PMB) was synthesized by refluxing 4,4'-bipyridine and 4-nitrobenzylchloride. A stable film of 1-phenylmethyl-4,4'-bipyridine (PMB) was successfully electrografted on glassy carbon electrodes by the reduction of the diazonium moieties generated in situ. High antifouling ability was obtained for the PMB modified electrode which makes it a useful sensor device for environmental waters monitoring. The modified electrode was used as an amperometric sensor for mediated hydrogen peroxide detection at -0.5 V. The calibration curve was linear from 5 to 60 mu M H2O2 (R-2=0.9978, n=7) with a detection limit of 0.25 mu M. PMB modified electrodes was able to detect oxygen in river water with good sensitivity, selectivity and reproducibility. |
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conference
Synthesis Of 4,4’-Dipyridine Derivatives For Immobilization On The Electrode Surface |
Chira A.; Bucur B.; Radulescu M.C.; Radu G.L. | Xxii International Symposium On Bioelectrochemistry And Bioenergetics, Bochum/Germany, 2013 | |
Rezumat |
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article
A Comparative Study Of Gold Electrodes Modification Methods With Aromatic Compounds Based On Diazonium And Thiol Chemistry |
Chira A.; Covaci O.; Radu G.L. | Upb Scientific Bulletin, Series B: Chemistry And Materials Science, 2012 | |
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conference
Use Of N-(P-Nitrobenzyl)-4.4’-Dipyridine For Electrodes Modification Based On Diazonium Chemistry |
Chira A.; Bucur B.; Radu G.L. | The 63Rd Annual Meeting Of The International Society Of Electrochemistry Ise, Praga, Republica Ceha, 2012 | |
Rezumat |
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article
Determination Of Silver(I) By Differential Pulse Voltammetry Using A Glassy Carbon Electrode Modified With Synthesized N-(2-Aminoethyl)-4,4 '-Bipyridine |
Bucur Madalina Petruta;Bucur Bogdan;Chira Ana;Radulescu Maria-Cristina;Radu Gabriel Lucian;Radulescu Medeea | Sensors, 2010 | |
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article
Determination Of Silver(I) By Differential Pulse Voltammetry Using A Glassy Carbon Electrode Modified With Synthesized N-(2-Aminoethyl)-4,4'-Bipyridine |
Radulescu M.-C.; Chira A.; Radulescu M.; Bucur B.; Bucur M.P.; Radu G.L. | Sensors, 2010 | |
RezumatA new modified glassy carbon electrode (GCE) based on a synthesized N-(2-aminoethyl)-4,4'-bipyridine (ABP) was developed for the determination of Ag(I) by differential pulse voltammetry (DPV). ABP was covalently immobilized on GC electrodes surface using 4-nitrobenzendiazonium (4-NBD) and glutaraldehyde (GA). The Ag(I) ions were preconcentrated by chemical interaction with bipyridine under a negative potential (-0.6 V); then the reduced ions were oxidized by differential pulse voltammetry and a peak was observed at 0.34 V. The calibration curve was linear in the concentration range from 0.05 μM to 1 μM Ag(I) with a detection limit of 0.025 μM and RSD = 3.6%, for 0.4 μM Ag(I). The presence of several common ions in more than 125-fold excess had no effect on the determination of Ag(I). The developed sensor was applied to the determination of Ag(I) in water samples using a standard addition method. © 2010 by the authors. |
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article
Determination Of Silver(I) By Differential Pulse Voltammetry Using A Glassy Carbon Electrode Modified With Synthesized N-(2-Aminoethyl)-4,4′-Bipyridine |
Radulescu Maria-Cristina; Chira Ana; Radulescu Medeea; Bucur Bogdan; Bucur Madalina Petruta; Radu Gabriel Lucian | Sensors, 2010 | |
RezumatA new modified glassy carbon electrode (GCE) based on a synthesized N-(2-aminoethyl)-4,4'-bipyridine (ABP) was developed for the determination of Ag(I) by differential pulse voltammetry (DPV). ABP was covalently immobilized on GC electrodes surface using 4-nitrobenzendiazonium (4-NBD) and glutaraldehyde (GA). The Ag(I) ions were preconcentrated by chemical interaction with bipyridine under a negative potential (-0.6 V); then the reduced ions were oxidized by differential pulse voltammetry and a peak was observed at 0.34 V. The calibration curve was linear in the concentration range from 0.05 mu M to 1 mu M Ag(I) with a detection limit of 0.025 mu M and RSD = 3.6%, for 0.4 mu M Ag(I). The presence of several common ions in more than 125-fold excess had no effect on the determination of Ag(I). The developed sensor was applied to the determination of Ag(I) in water samples using a standard addition method. |