Adina Arvinte
@icmpp.ro
Centre of Advanced Research in Bionanoconjugates and Biopolymers
"Petru Poni" Institute of Macromolecular Chemistry
RESEARCH, TEACHING, or OTHER INTERESTS
Electrochemistry, Analytical Chemistry, Materials Chemistry, Surfaces, Coatings and Films
Scopus Publications
Scopus Publications
Adina Arvinte, Ana-Lacramioara Lungoci, Adina Coroaba, and Mariana Pinteala
MDPI AG
The superior properties of electrodeposited trimetallic CuZnCo nanoparticles, arising from the synergistic effect of combining the unique features of metallic components, were confirmed using voltametric measurements. The surface morphology and structure of the as-prepared electrocatalysts were determined using scanning electron microscopy, energy-dispersive X-ray, and X-ray photoelectron spectroscopy techniques. Here, the trimetallic CuZnCo nanoparticles were synthesized as a powerful redox probe and highly efficient signal amplifier for the electrochemical oxidation of tryptophan. Differential pulse voltammetry studies showed a linear relationship with a tryptophan concentration of 5–230 μM, and the low detection limit was identified at 1.1 μM with a sensitivity of 0.1831 μA μM−1 cm−2.
Oana Elena Carp, Mariana Pinteala, and Adina Arvinte
MDPI AG
The use of the Liebermann–Burchard reaction in this study has been explored in the development of a simple, reliable, and robust quantitative electrochemical method to assay cholesterol, and hence provide a good alternative to colorimetric methods. The optimization of batch mode operation for electrochemical oxidation of cholesterol in the Liebermann–Burchard reagents included the applied potential and acidic volume. Tested using chronoamperometry, the developed method showed a high sensitivity (14.959 μA mM−1) and low detection limit (19.78 nM) over a 0.025–3 mM concentration range, with remarkable linearity (R2 = 0.999), proving an analytical performance either higher or comparable to most of the cholesterol sensors discussed in literature. The influence of possible interfering bioactive agents, namely, glucose, uric acid, ascorbic acid, KCl and NaCl, has been evaluated with no or negligible effects on the measurement of cholesterol. Our study was directed at finding a new approach to chemical processing arising from the use of external potential as an additional level of control for chemical reactions and the transfer of electrons between surfaces and molecules. Finally, the optimized method was successfully applied for the determination of cholesterol content in real blood samples.
Oana Elena Carp, Aurelian Moraru, Mariana Pinteala, and Adina Arvinte
Elsevier BV
Raoul V. Lupusoru, Daniela A. Pricop, Cristina M. Uritu, Adina Arvinte, Adina Coroaba, Irina Esanu, Mirela F. Zaltariov, Mihaela Silion, Cipriana Stefanescu, and Mariana Pinteala
Springer Science and Business Media LLC
AbstractThe paper aims to investigate the cytotoxic effect on tumor cells of irradiated AuNPs in green light and subsequently functionalized with HS-PEG-NH2. The toxicity level of gold conjugates after their functionalization with DOX and TAT peptide was also evaluated. The AuNPs were prepared using the modified Turkevich method and exposed to visible light at a wavelength of 520 nm prior their PEGylation. The optical properties were analyzed by UV-vis spectroscopy, the surface modification was investigated using FTIR and XPS spectroscopies and their sizes and morphologies were evaluated by TEM and DLS techniques. DOX and TAT peptide were linked to the surface of PEGylated AuNPs by reacting their amino groups with glycidyloxypropyl of PEGylated DOX or TAT conjugates under mild conditions at room temperature and in the presence of ethanol as catalyst. The conjugates containing DOX or DOX and TAT have been characterized by fluorescence and FTIR techniques. The changes of electrochemical features were observed using cyclic voltammetry, suggesting a better stability of irradiated nanoparticles. By mass spectrometry it was confirmed that the compounds of interest were obtained. The cell viability test showed that irradiated and non-irradiated nanoparticles coated with PEG are not toxic in normal cells. Tumor cell viability analysis showed that the PEGylated nanoparticles modified with DOX and TAT peptide were more effective than pristine DOX, indicating cytotoxicity up to 10% higher than non-irradiated ones.
Adina Arvinte, Adama Marie Sesay, and Vesa Virtanen
Elsevier BV
Ana-Lacramioara Lungoci, Ioana-Andreea Turin-Moleavin, Andreea Corciova, Cornelia Mircea, Adina Arvinte, Adrian Fifere, Narcisa Laura Marangoci, and Mariana Pinteala
Elsevier BV
Adina Arvinte, Irina-Alexandra Crudu, Florica Doroftei, Daniel Timpu, and Mariana Pinteala
Elsevier BV
Claudia Teodora Teodorescu-Soare, C. Catrinescu, M. Dobromir, G. Stoian, Adina Arvinte, and D. Luca
Elsevier BV
Adina Arvinte and Adama Marie Sesay
John Wiley & Sons, Inc.
Adina Arvinte, Maurusa Ignat, Mariana Pinteala, and Leonard Ignat
Bentham Science Publishers Ltd.
Adina Arvinte, Florica Doroftei, and Mariana Pinteala
Springer Science and Business Media LLC
Adina Arvinte, Narcisa Marangoci, Alina Nicolescu, and Mariana Pinteala
Royal Society of Chemistry (RSC)
Electrochemical behavior changes due to the formation of inclusion complexes.
Ioana-Maria Simionca, Adina Arvinte, and Mariana Pinteala
SAGE Publications
N-(2-Hydroxypropyl)methacrylamide-co- N-acryloxysuccinimide with 2-aminomethyl-18-crown-6 (p(HPMA-NAS-18C6)) graft copolymer deposited on the gold (Au) electrode is able to bind heavy metal cations from aqueous solutions. The binding of the lead(II) cations (Pb2+) is monitored by quartz crystal microbalance, cyclic voltammetry, and anodic stripping voltammetry. Electrochemical studies have demonstrated that the presence of p(HPMA-NAS-18C8) on the Au electrode surface resulted in the shift of Pb oxidation wave to less negative potentials, accompanied by the increase of the oxidation peak magnitude. The p(HPMA-NAS-18C6)-modified electrode could sensitively detect Pb2+ cations in a range from 10 ppb to 4.39 ppm with a low detection limit of 0.17 ppb.
Luminita Marin, Arie van der Lee, Sergiu Shova, Adina Arvinte, and Mihail Barboiu
Royal Society of Chemistry (RSC)
Imine compounds containing rigid cores and soft aliphatic tails have been designed to generate molecular glasses and large crystals displaying aggregation-induced emission, which makes them interesting candidates for optoelectronic applications.
Mariana-Dana Damaceanu, Hans-Detlev Gilsing, Burkhard Schulz, Adina Arvinte, and Maria Bruma
Royal Society of Chemistry (RSC)
UV-vis spectra of P(ProDOT-EO-ester) in THF in the presence of different cations.
Narcisa Marangoci, Stelian S. Maier, Rodinel Ardeleanu, Adina Arvinte, Adrian Fifere, Anca Roxana Petrovici, Alina Nicolescu, Valentin Nastasa, Mihai Mares, Sorin A. Pasca,et al.
American Chemical Society (ACS)
The toxicity of viologens can be significantly reduced by including them in tight [2]rotaxane structures alongside β-cyclodextrin, thus turning them into candidates of pharmaceutical interest. Here, we report a synthesis pathway for a benign viologen, by capping a small β-cyclodextrin-caged molecule, the 4,4'-bipyridine, with minimal-length presynthesized axle-stopper segments of the propyl-3-pentamethyldisiloxane type. After 90 min from the oral administration to laboratory mice, the product concentration in the bloodstream reaches a value equivalent to 0.634% of the initial dose of 800 mg·kg(-1). As compared to the nude viologen having the same structure, which proved to be lethal in doses of 40 mg·kg(-1), the product induces reversible morphological changes in the liver, kidney, lung, and cerebellum, up to a dose of 400 mg·kg(-1), with higher dosages giving rise to a chronic slow evolution.
Mihaela Alexandru, Maria Cazacu, Adina Arvinte, Sergiu Shova, Constantin Turta, Bogdan C. Simionescu, Anatolie Dobrov, Elisabete C. B. A. Alegria, Luísa M. D. R. S. Martins, Armando J. L. Pombeiro,et al.
Wiley
The reaction of 2,6-diformyl-4-methylphenol with 1,3-bis(3-aminopropyl)tetramethyldisiloxane in the presence of MnCl2 in a 1:1:2 molar ratio in methanol afforded a dinuclear μ-chlorido-bridged manganese(II) complex of the macrocyclic [2+2] condensation product (H2L), namely, [Mn2Cl2(H2L)(HL)]Cl·3H2O (1). The latter afforded a new compound, namely, [Mn2Cl2(H2L)2][MnCl4]·4CH3CN·0.5CHCl3·0.4H2O (2), after recrystallisation from 1:1 CHCl3/CH3CN. The co-existence of the free and complexed azomethine groups, phenolato donors, μ-chlorido bridges, and the disiloxane unit were well evidenced by ESI mass spectrometry and FTIR spectroscopy and confirmed by X-ray crystallography. The magnetic measurements revealed an antiferromagnetic interaction between the two high-spin (S = 5/2, g = 2) manganese(II) ions through the μ-chlorido bridging ligands. The electrochemical behaviour of 1 and 2 has been studied, and details of their redox properties are reported. Both compounds act as catalysts or catalyst precursors in the solvent-free low-power microwave-assisted oxidation of selected secondary alcohols, for example, 1-phenylethanol, cyclohexanol, 2- and 3-octanol, to the corresponding ketones in the absence of solvent. The highest yield of 72 % was achieved for 1-phenylethanol by using a maximum of 1 % molar ratio of catalyst relative to substrate.
Florica Doroftei, Tudor Pinteala, and Adina Arvinte
Springer Science and Business Media LLC
Carmen Racles, Mihaela Silion, Adina Arvinte, Mihai Iacob, and Maria Cazacu
Informa UK Limited
Siloxane-containing polyazomethines with linear (PAZ) and cross-linked (CPAZ) architectures and their iron complexes (FePAZ and CFePAZ) have been prepared. The structures of the resulted compounds were investigated by spectral methods (FT-IR, 1H NMR, UV–vis) and electrospray ionization mass spectrometry (ESI-MS). X-ray fluorescence spectrometry was used to determine the Si/Fe ratio and for quantitative analysis of silicon. Paramagnetic susceptibility (χ) and magnetic moment (μ eff) of the soluble iron complex were estimated based on 1H NMR measurements. The iron spin state was determined by Mössbauer spectroscopy, while the electrochemical behavior was studied by cyclic voltammetry. The catalytic activity in hydrogen peroxide decomposition reaction, in alkaline solution was tested. The compound FePAZ proved to increase the dielectric constant of a silicone matrix in which it was incorporated even in very low percent, acting also as an effective plasticizer.
Luminita Marin, Valeria Harabagiu, Arie van der Lee, Adina Arvinte, and Mihail Barboiu
Elsevier BV
Ioana-Maria Simionca, Adina Arvinte, Rodinel Ardeleanu, and Mariana Pinteala
Wiley
A siloxane-crown ether polyamide copolymer (PDMS-PA-DB18C6) was electrochemically investigated for fabrication of lead-sensitive electrodes for trace analysis in aqueous solutions. The PDMS-PA-DB18C6 electrodes were successfully evaluated for anodic stripping voltammetric determination of lead(II) as a promising alternative for the detection of lead at ppb levels. By a judicious choice of the deposition time, electrolyte concentration and pulse amplitude, good analytical performance of the developed sensor could be achieved, with a linear response in the range of 20–700 ppb, when LOD of 3.5 ppb could be attained. This method showed a good degree of selectivity and sensitivity for lead, suitable for the determination of Pb2+ in wastewater sample.
Angelica Vlad, Maria Cazacu, Constantin Turta, Radu Ionut Tigoianu, Anton Airinei, and Adina Arvinte
Elsevier BV
Adina Arvinte, Mika Mahosenaho, Mariana Pinteala, Adama-Marie Sesay, and Vesa Virtanen
Springer Science and Business Media LLC
Adina Arvinte, Adama-Marie Sesay, and Vesa Virtanen
Elsevier BV