Dorina Simedru

Dorina Simedru
INCDO-INOE 2000, Research Institute for Analytical Instrumentation | ICIA · R&D

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26
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372
Citations

Publications

Publications (26)
Article
Full-text available
The aim of this study was to investigate the use of natural zeolite as support for microbial community formation during wastewater treatment. Scanning electron microscopy (SEM), thermal decomposition and differential thermogravimetric curves (TGA/DGT) techniques were used for the physicochemical and structural characterization of zeolites. The chem...
Article
Full-text available
The present work investigates the effect of freeze–thaw cycles on the porosity of three mixtures of road concrete containing blast furnace slag in comparison with two mixtures made with conventional materials. The main technique used in our investigations is nuclear magnetic resonance (NMR) relaxometry. This permitted the extraction of information...
Article
Hydroxyapatite (HAP), the main mineral component of bone and tooth enamel, has become an important biomaterial in orthopedic and dental applications. However, its low fracture toughness, poor tensile strength and wear resistance make it not suitable to be used in bone tissue engineering applications, the improvement of mechanical properties of HAP...
Article
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Mint (Mentha spp.), one of the most used plants in traditional medicine, is cultivated since antiquity, being mentioned by ancient writings. Besides its use for improving the human health, mint extracts are found in food, cosmetics, detergents, perfumes, biopesticides, etc. Due to its multiple benefits mint consumption has increased continuously in...
Article
In the present work, a procedure to determine three textile azo dyes, chromium-complexes [Nylosan Dark Brown (NDB), Lanasyn Dark Brown (LDB), and Lanasyn Red (LR)], from wastewater using solid-phase extraction (SPE) followed by LC-electrospray ionization negative mode tandem mass spectrometry (LC-ESI(-)-MS/MS) has been developed. The extraction/con...
Article
Full-text available
The transfer of active substances of pharmaceutical forms is influenced by several factors, among which the nature of the excipients used in compression. The objective of this study was to investigate the influence of cellulose and its derivatives (hydroxypropylcellulose, hydroxylpropylmethylcellulose, carboxymethylcellulose) on the release profile...
Article
A diet rich in antioxidants is a heath choice most people make when it comes to options in fighting free radicals, that are formed natural in the body, but that cause damage to DNA and are connected to aging. The study was done in order the evaluate fruit teas that are a sources of antioxidants that can be easily introduce in the diet and are found...
Article
Preservation of old entomology items, although very important, is very difficult due to the contamination which they were subjected. In order to test the items contamination level with the classical sampling method, one must be very careful because they are very easily to break and can develop mold spores due to the moistening. The subject of this...
Article
The purpose of this study was to develop a quick procedure for the determination of α-phosphatidylcholine from soybean. The procedure is based on a simple solid-liquid extraction followed by a quick analytical method carried out with an LC-ESI-MS/MS system. A chromatographic column of 2×50 mm with a particle size of 2.5 µm was used. The LC-ESI-MS/M...
Article
Celery is recently the subject of various studies due to its role in human nutrition and for medicine purposes. One of the most speculated ideas is that celery contains high quantities of androsterone which makes it suitable for infertility treatments. Due to this trend, the purpose of this study was to develop an analytical method suitable to conf...
Article
Full-text available
The aim of this study was to investigate the concentration level of some major-to-trace elements and toxic minerals and polyphenols (catechin, epicatechin and quercetin) in fruits belonging to different apple cultivars ('Auriu de Cluj', 'Florina', 'Generos', 'Golden Delicious', 'Prima', 'Productiv de Cluj' and 'Starkrimson'), under specific climate...
Article
The aim of this study was to investigate the concentration level of some major-to-trace elements and toxic minerals and polyphenols (catechin, epicatechin and quercetin) in fruits belonging to different apple cultivars (‘Auriu de Cluj’, ‘Florina’, ‘Generos’, ‘Golden Delicious’, ‘Prima’, ‘Productiv de Cluj’ and ‘Starkrimson...
Article
This study describes a procedure for the determination of two textile dyes (Nylosan Red N-2RBL-azo and Optilan Blue MF-GL-anthraquinone) from wastewater by solid phase extraction and liquid chromatography/electrospray ionization tandem mass spectrometry (SPE-LC/ESI-MS/MS) analysis. Four types of Strata SPE cartridges (C18-U, C18-E, WAX/NH2, and SAX...
Article
xV(2)O(5)center dot(100 - x)[0.7P(2)O(5)center dot 0.3CaO] glass system was obtained for 0 a parts per thousand currency sign x a parts per thousand currency sign 35 mol% V2O5. In order to obtain information regarding their structure, several techniques such as X-Ray diffraction, FT-IR, and EPR spectroscopies were used. X-Ray diffraction patterns o...
Article
Full-text available
The copolymers were synthesized by the microwave-assisted polycondensation of L-lactic acid (LA), ethylene glycol (EG) and terephthalic acid (TPA) (different ratio of monomers). Biodegradation tests of the obtained copolymers and microcrystalline cellulose (MC) were performed under controlled composting conditions using a standard test method (ISO...
Article
Pesticides are chemical compounds used in agriculture to destroy the pests and weeds but with great potential on environment contamination. An analytical method for screening and confirming the presence of 5 pesticides (acetamiprid, cymoxanil, mefenoxam, thiacloprid, thiametoxam) was developed. LC/MS/MS was proved to be a sensitive technique for th...
Article
xMnO·(100−x)[As2O3·TeO2] glass system, with 0≤x≤50 mol %, was prepared and investigated by FT-IR and Raman spectroscopies in order to determine its structure and the changes induced by the increasing of MnO content.The results offered by FT-IR and Raman spectroscopies suggest a structure formed by AsO3, TeO4 tbp and TeO3 tp units. The presence of M...
Article
Glasses from xFe2O3 · (100 − x)[P2O5 · TeO2] system, with 0 ≤ x ≤ 50 mol%, were investigated by X-ray diffraction, FT-IR and EPR spectroscopies. The XRD patterns show a vitreous state of studied samples for x ≤ 35 mol% Fe2O3. The FT-IR spectrum of the P2O5 · TeO2 glass matrix reveals a structure formed from PO4, TeO4 and TeO3 units. The addition an...
Article
EPR and FT-IR absorption measurements have been performed for xCuO·(100−x)[2Bi2O3·B2O3] glass system, with 0⩽x⩽50mol%. The mode in which the addition of the copper ions influences the structure of 2Bi2O3·B2O3 glass matrix was analyzed. The EPR absorption spectra revealed the presence in the glass structure of Cu2+ ions in axially distorted octahedr...
Article
xMnO·(100−x)[As2O3·PbO] glass system, with 0≤x≤5mol%, was studied by FT-IR and Raman spectroscopies in order to determine their structure and to point out the role of each component of the glass system in the formation of the glass network. FT-IR spectrum of the glass matrix shows the presence of AsO3, PbO4 and PbO3 structural units. The Raman spec...
Article
xFe2O3·(100 − x)[Bi2O3·CdO] system with 0 ≤ x ≤ 50 mol% was prepared and investigated by X-ray diffraction, density, FT-IR and Raman spectroscopies. The XRD patterns confirm the formation of a vitreous structure for x < 35 mol% Fe2O3. The evolution of density and molar volume with the addition and increasing of iron content indicates structural cha...
Article
A comparative structural study was made on the glass systems xFe 2O3·(100-x)Bi2O3 and xFe 2O3-(100-x)[Bi2O3·MO] (where MO => CdO, AS2O3 and GeO2), with 0 ≤ × ≤50 mol%. The samples were prepared and investigated by X - ray diffraction, FT-IR and Raman spectroscopies in order to determine their local structure. From FT - IR spectra it can be observed...
Article
\({x\hbox{V}_{2}\hbox{O}_{5}\cdot(100-\hbox{x})[\hbox{P}_{2}\hbox{O}_{5}\cdot\hbox{Li}_{2} \hbox{O}]}\) glass system, with 0 < x \({\le }\) 50 mol%, was prepared and investigated by EPR method. For low content of V2O5 all the spectra present a hyperfine structure typical for isolated V4+ ions. With the increasing of V2O5 content, the EPR absorption...
Article
Glasses from xMeO·(100−x)[P2O5·Li2O] (MeO⇒Fe2O3 or V2O5) systems, with 0≤x≤50 mol%, were prepared and investigated by Raman spectroscopy. The influence of Fe2O3 and V2O5 content on the structure of P2O5·Li2O glass matrix was followed.The P2O5·Li2O glass matrix presents three absorption bands characteristic to metaphosphate chain structures. The add...
Article
The structure of xFe2O3·(100-x)[3B2O3·BaO] system with 0≤x≤50 mol% was studied by DTA, X-ray diffraction, density, optical microscopy and EPR measurements in vitreous and partial crystallized state, the samples being obtained by under cooling method. The data obtained show that, by melting the samples at Te = 1200°C or Te = 1250°C, glasses for x≤35...

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