Cornel Munteanu
Romanian Academy
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Publication
Featured researches published by Cornel Munteanu.
Journal of Inorganic and Organometallic Polymers and Materials | 2016
Madalina Tudose; Daniela C. Culita; Adina Magdalena Musuc; Gabriela Marinescu; Simona Somacescu; Cornel Munteanu; Coralia Bleotu; Mariana C. Chifiriuc
The paper describes a rapid and simple method for preparing a multifunctional biomaterial based on retinoic acid covalently bound on silica@Ag particles. Monodispersed SiO2 particles were prepared by Stöber method and further used for loading the Ag nanoparticles on their surface. This composite was further functionalized with retinoic acid. Characterization of the hybrid materials was made by UV–Visible spectroscopy, Transmission electron microscopy, Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and Thermal analysis. The biological evaluation of the obtained materials revealed their potential use for multiple biomedical applications, from anti-proliferative agents to novel antimicrobial and antibiofilm strategies.
Journal of Thermal Analysis and Calorimetry | 2015
Adina Magdalena Musuc; Raluca Dumitru; Alina Stan; Cornel Munteanu; Ruxandra Birjega; Oana Carp
Abstract Two methylcellulose–ZnO and one methylcellulose–Zn2+ composites were obtained by precipitation and hydrothermal procedures. The thermal behavior of the composites was examined by simultaneous TG, DTG, DSC-FTIR thermal method. It was found that the thermal reactivity of the methylcellulose contained by the composites is strongly dependent on the composites’ synthetic procedure, but in all cases its stability is shifted toward lower temperatures. For each type of composites, the causes that lead to a change of methylcellulose thermoreactivity were highlighted. The structural, morphological and optical characteristics of the ZnO-based materials are also demonstrated.
Chemical Papers | 2015
Petre Ionita; Vasile Dinoiu; Cornel Munteanu; Ioana Maria Turcu; Victorita Tecuceanu; Traian Zaharescu; Eliza Oprea; Cornelia Ilie; Dan F. Anghel; Gabriela Ionita
The rosemary extract was encapsulated in polyethylene or in covalently-based network gels. The covalent gels were obtained by the reaction of isocyanate end-capped polyethylene glycol (PEG) with β-cyclodextrin or glycerol. The 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay was used to evaluate the antioxidant activity (AA) of rosemary extract entrapped in polymeric structures and in ethanol or water solutions. The AA of the rosemary extract was determined using a DPPH radical for samples prepared in ethanol, and a water-soluble derivative, the sulphonated DPPH radical (DPPH-SO3Na), for the rosemary extract in water. Formulation of the rosemary extract in polymeric gels ensures a rapid release which determines the AA values similar to those in solution.
Central European Journal of Chemistry | 2014
Ioan Călinescu; Diana Martin; Daniel Ighigeanu; Adina Ionuta Gavrila; Adrian Trifan; Mariana Patrascu; Cornel Munteanu; Aurel Diacon; Elena Manaila; Gabriela Craciun
AbstractElectron beam (EB) irradiation is a useful method to generate stable silver nanoparticles without the interference of inherent impurities generated from chemical reactions. Our experiments were carried out using linear electron beam accelerators with two different EB absorbed dose rates: 2 kGy min−1 and 7–8 kGy s−1, and with different absorbed dose levels. The optimum conditions for silver nanoparticles (AgNPs) generation by radiolysis, or by radiolysis combined with chemical reduction, were established. In order to obtain a good yield for AgNPs synthesized by radiolysis, a high dose rate is required, resulting in a rapid production process. At low absorbed dose rates, the utilization of a stabilization agent is advisable. By modifying the experimental conditions, the ratio between the chemical and radiolytic reduction process can be adjusted, thus it is possible to obtain nanoparticles with tailored characteristics, depending on the desired application.
Molecules | 2018
Crina Anastasescu; Silviu Preda; Adriana Rusu; Dana Culita; Gabriel Plavan; Stefan Strungaru; Jose Maria Calderon-Moreno; Cornel Munteanu; Catalina Gifu; Mirela Enache; Radu Socoteanu; Daniel G. Angelescu; Mihai Anastasescu; Mariuca Gartner; Ioan Balint; Maria Zaharescu
A wide range of hybrid biomaterials has been designed in order to sustain bioremediation processes by associating sol-gel SiO2 matrices with various biologically active compounds (enzymes, antibodies). SiO2 is a widespread, chemically stable and non-toxic material; thus, the immobilization of enzymes on silica may lead to improving the efficiency of biocatalysts in terms of endurance and economic costs. Our present work explores the potential of different hybrid morphologies, based on hollow tubes and solid spheres of amorphous SiO2, for enzyme immobilization and the development of competitive biocatalysts. The synthesis protocol and structural characterization of spherical and tubular SiO2 obtained by the sol gel method were fully investigated in connection with the subsequent immobilization of lipase from Rhizopus orizae. The immobilization is conducted at pH 6, lower than the isoelectric point of lipase and higher than the isoelectric point of silica, which is meant to sustain the physical interactions of the enzyme with the SiO2 matrix. The morphological, textural and surface properties of spherical and tubular SiO2 were investigated by SEM, nitrogen sorption, and electrokinetic potential measurements, while the formation and characterization of hybrid organic-inorganic complexes were studied by UV-VIS, FTIR-ATR and fluorescence spectroscopy. The highest degree of enzyme immobilization (as depicted from total organic carbon) was achieved for tubular morphology and the hydrolysis of p-nitrophenyl acetate was used as an enzymatic model reaction conducted in the presence of hybrid lipase–SiO2 complex.
Applied Catalysis A-general | 2013
Raluca Dumitru; Florica Papa; Ioan Balint; Daniela C. Culita; Cornel Munteanu; Nicolae Stanica; Adelina Ianculescu; Lucian Diamandescu; Oana Carp
Ceramics International | 2016
Irina Atkinson; Elena Maria Anghel; Luminita Predoana; Oana-Cătălina Mocioiu; L. Jecu; I. Raut; Cornel Munteanu; Daniela C. Culita; Maria Zaharescu
Ceramics International | 2014
Ligia Todan; Tiberiu Dascalescu; Silviu Preda; Cristian Andronescu; Cornel Munteanu; Daniela C. Culita; Adriana Rusu; Razvan State; Maria Zaharescu
Journal of Physical Chemistry C | 2015
Raul−Augustin Mitran; Daniela Berger; Cornel Munteanu; Cristian Matei
Catalysis Today | 2010
M. Caldararu; M. Scurtu; C. Hornoiu; Cornel Munteanu; Teresa Blasco; J.M. López Nieto