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108 results on '"Maganu, Maria"'

1. Immobilization of natural betalain pigments in inorganic hosts

Author

Todan Ligia, Culita Daniela C., Soare Mirabela E., Ion Rodica M., Fierascu Radu C., and Maganu Maria

Subjects
betanin, encapsulation, mesoporous silica, aluminosilicate, color parameters, Chemistry, QD1-999
Abstract

In search of new food-grade pH sensitive formulations, red beet extract rich in betacyanin was included in different inorganic matrices based on silica and aluminosilicate to improve the stability of the dye. By the direct method of encapsulation of the pigments in silica support, stabilizing agents such as inclusion complex forming β-cyclodextrin and ascorbic acid were added. The post loading system assumes the synthesis of porous silica and aluminosilicate powders and the adsorption of the beet extract by these supports. The unloaded carriers were structurally and texturally characterized (X-ray diffraction, FTIR, N2-physisorption). The presence of betanin, approved as a red food colorant, was evidenced by UV–Vis spectroscopy in all the hosts. Color properties were investigated as well as the pH generated color variations of the powders exposed to ammonia in the head-space of a sealed vessel. The obtained results could widen the field of applications of beet extract, the prepared ecological formulations could provide added value to edible products packaging.

Published
2024
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16. Synthesis and Products Properties

Author

Cristea, Mihaela, Bîrzan, Liviu, Dumitrascu, Florea, Enache, Cristian, Tecuceanu, Victorita, Hanganu, Anamaria, Drăghici, Constantin, Deleanu, Călin, Nicolescu, Alina, Maganu, Maria, and Razus, Alexandru C.

Subjects
1-vinylazulene, Erlenmeyer–Plöchl synthesis, UV-Vis and NMR spectra, oxazolonic ring
Abstract

As a continuation of research on 1-vinylazulenes synthesis, on their physico–chemical properties as well as on their use as colorimetric and electrochemical materials for the detection of heavy metals ions, new compounds, 4-(azulen-1-ylmethylene)-2-phenyloxazol-5(4H)-ones, are reported. The exceptional structure of azulene moiety with symmetrical electron distribution only with respect to the x-axis gives some special chemical and physical properties to compounds in which it is inserted. Various azulene-1-carbaldehydes and hippuric acids are condensed with good yields in Erlenmeyer—Plöchl reaction conditions. The obtained 1-vinylzulenes were characterized and their UV-Vis and NMR spectra were briefly discussed.

Published
2021
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18. 1-Vinylazulenes with Oxazolonic Ring-Potential Ligands for Metal Ion Detectors; Synthesis and Products Properties

Author

Cristea, Mihaela, primary, Bîrzan, Liviu, additional, Dumitrascu, Florea, additional, Enache, Cristian, additional, Tecuceanu, Victorita, additional, Hanganu, Anamaria, additional, Drăghici, Constantin, additional, Deleanu, Călin, additional, Nicolescu, Alina, additional, Maganu, Maria, additional, and Razus, Alexandru C., additional

Published
2021
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26. Anomeric ratio and dihedral angles of α,β-iodo-methyl-D-ribofuranose

Author

Mitan, Carmen-Irena, primary, Stavarache, Carmen, primary, Bartha, Emerik, primary, Teodorescu, Florina, primary, Hartopeanu, Anca, primary, Draghici, Constantin, primary, Maganu, Maria, primary, Man, Isabela, primary, Teodor Caproiu, Miron, primary, Deleanu, Calin, primary, Tarko, Lazlo, primary, Bartha, Emerich, primary, Hirtopeanu, Anca, primary, Miron Teodor, Caproiu, primary, Maria, Maganu, primary, Isabela, Man, primary, Florina, Teodorescu, primary, and Calin, Deleanu, primary

Published
2020
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29. New Carbocyclic Nucleosides with a Constrained Bicyclo[2.2.1]Heptane Fragment as a Glycoside Moiety

Author

Tanase, Constantin I., primary, Draghici, Constantin, additional, Hanganu, Anamaria, additional, Pintilie, Lucia, additional, Maganu, Maria, additional, Munteanu, Cristian V. A., additional, Volobueva, Alexandrina, additional, Sinegubova, Ekaterina, additional, Zarubaev, Vladimir V., additional, Neyts, Johan, additional, Jochmans, Dirck, additional, and Slita, Alexander V., additional

Published
2019
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35. SOL-GEL OBTAINED SILICA BASED PARTICLES - SENSING PLATFORMS FOR FLUORESCENT PH PROBES.

Author

TODAN, LIGIA, VOICESCU, MARIANA, CULIȚĂ, DANA C., PETRESCU, SIMONA, MAGANU, MARIA, and CIUCULESCU, CRINU

Subjects
SILICA, SOL-gel processes, FLUORESCENT probes, RHODAMINE B, ORGANOSILICON compounds, ETHYL silicate, FOURIER transform infrared spectroscopy, PH effect
Abstract

Copyright of Romanian Journal of Materials / Revista Romana de Materiale is the property of Foundation for Materials Science & Engineering Serban Solacolu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2018

37. Novel 1,1-diphenylhydrazine derivatives of benzofurazan and their dimerization

Author

Hristea, Elena N., primary, Bem, Marioara, additional, Balaban, Teodor Silviu, additional, Eichhöfer, Andreas, additional, Caproiu, Miron T., additional, Draghici, Constantin, additional, Ionita, Gabriela, additional, Spataru, Tanta, additional, Enache, Cristian, additional, Maganu, Maria, additional, Beteringhe, Adrian, additional, Hillebrand, Mihaela, additional, Constantinescu, Titus, additional, and Balaban, Alexandru T., additional

Published
2011
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40. 3,5-Dinitro-N-(4’-benzo-15-crown-5)-benzamide derivatives. Synthesis and properties

Author

Baratoiu, Rodica D., primary, Mutihac, Lucia, additional, Caproiu, Miron T., additional, Draghici, Constantin, additional, Dumitrascu, Florin, additional, Socoteanu, Radu, additional, Beteringhe, Adrian, additional, Maganu, Maria, additional, Covaci, Irina C., additional, Bem, Marioara, additional, Constantinescu, Titus, additional, and Balaban, Alexandru T., additional

Published
2008
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41. 4-(D-Glucosamino)-7-nitrobenzoxadiazole: synthesis, anomers, spectra, TLC behavior, and applications

Author

Bem, Marioara, primary, Badea, Florin, additional, Draghici, Constantin, additional, Caproiu, Miron Teodor, additional, Vasilescu, Marilena, additional, Voicescu, Mariana, additional, Pencu, Gabriela, additional, Beteringhe, Adrian, additional, Maganu, Maria, additional, Covaci, Irina Cristina, additional, Constantinescu, Titus, additional, and Balaban, Alexandru T., additional

Published
2008
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44. Carbonic anhydrase inhibitors: sulfonamides incorporating furan-, thiophene- and pyrrole-carboxamido groups possess strong topical intraocular pressure lowering properties as aqueous suspensions

Author

Ilies, Monica, primary, Supuran, Claudiu T., additional, Scozzafava, Andrea, additional, Casini, Angela, additional, Mincione, Francesco, additional, Menabuoni, Luca, additional, Caproiu, Miron T., additional, Maganu, Maria, additional, and Banciu, Mircea D., additional

Published
2000
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45. New approaches in layer by layer synthesis of collagen/hydroxyapatite composite materials.

Author

Ilie, Andreia, Andronescu, Ecaterina, Ficai, Denisa, Voicu, Georgeta, Ficai, Maria, Maganu, Maria, and Ficai, Anton

Abstract

The aim of this work was to increase our understanding of collagen (COLL)/ hydroxyapatite (HA) composite materials; more specifically, we focused on the study of the influence of the precursorconcentrations over the final content of deposited HA. We found that the increase of the precursor concentrations led to better mineralization (on the basis of the content of deposited mineral phase). Regardless of the precursor concentrations, the content of the deposited amount was found to increase with the increase of the number of deposited layers. Quantification of the mineral phase amount was achieved by gravimetric determination. Based on the determined deposition equation the number of layers can be easily determined in order to obtain composite materials with desired content of mineral phase. [ABSTRACT FROM AUTHOR]

Published
2011
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46. New N-aryloxy-phthalimide derivatives. Synthesis, physico-chemical properties, and QSPR studies.

Author

Tudose, Madalina, Badea, Florin D., Caproiu, Miron T., Beteringhe, Adrian, Maganu, Maria, Ionita, Petre, Constantinescu, Titus, and Balaban, Alexandru T.

Abstract

Starting from N-hydroxyphthalimide 1 and the reactive fluoro- or chloro-nitroaryl derivatives 2, 3 and 4a-e (2-chloro-3,5-dinitropyridine; 3, NBD-chloride; 4a, 1-fluoro-2,4-dinitrobenzene; 4b, picryl chloride; 4c, 4-chloro-3,5-dinitrobenzotrifluoride; 4d, 2-chloro-3,5- dinitrobenzotrifluoride; 4e, 4-chloro-3,5-dinitrobenzoic acid) the corresponding N-(2-nitroaryloxy)-phthalimide derivatives 5a-e, or 6 and 7 were obtained and characterized by IR, UV-Vis 1H-NMR and 13C-NMR spectroscopy. The TLC behavior and the hydrophobicity of these derivatives have been experimentally evaluated by RM0 parameters (using RP-TLC). The experimental RM0 parameters were compared with the calculated partition coefficient, log P. A QSPR study was also performed to establish possible correlations between the structure and physical properties (λmax and RM0) of compounds 5a-e, 6, and 7. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

Published
2010
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47. New HSV-1 Anti-Viral 1′-Homocarbocyclic Nucleoside Analogs with an Optically Active Substituted Bicyclo[2.2.1]Heptane Fragment as a Glycoside Moiety.

Author

Tănase, Constantin I., Drăghici, Constantin, Hanganu, Anamaria, Pintilie, Lucia, Maganu, Maria, Volobueva, Alexandrina, Sinegubova, Ekaterina, Zarubaev, Vladimir V., Neyts, Johan, Jochmans, Dirk, and Slita, Alexander V.

Subjects
MITSUNOBU reaction, YELLOW fever, BASE pairs, ADENINE, HEPTANE, AMINES
Abstract

New 1′-homocarbanucleoside analogs with an optically active substituted bicyclo[2.2.1]heptane skeleton as sugar moiety were synthesized. The pyrimidine analogs with uracil, 5-fluorouracil, thymine and cytosine and key intermediate with 6-chloropurine (5) as nucleobases were synthesized by a selective Mitsunobu reaction on the primary hydroxymethyl group in the presence of 5-endo-hydroxyl group. Adenine and 6-substituted adenine homonucleosides were obtained by the substitution of the 6-chlorine atom of the key intermediate 5 with ammonia and selected amines, and 6-methoxy- and 6-ethoxy substituted purine homonucleosides by reaction with the corresponding alkoxides. No derivatives appeared active against entero, yellow fever, chikungunya, and adeno type 1viruses. Two compounds (6j and 6d) had lower IC50 (15 ± 2 and 21 ± 4 µM) and compound 6f had an identical value of IC50 (28 ± 4 µM) to that of acyclovir, suggesting that the bicyclo[2.2.1]heptane skeleton could be further studied to find a candidate for sugar moiety of the nucleosides. [ABSTRACT FROM AUTHOR]

Published
2019
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