The aim of our study was to investigate the antioxidant capacity of some ethanol extracts prepared from seeds and skins of different types of red grapes and corresponding commercial wines from Romanian Recas winery. The antioxidant activity was evaluated by UV-VIS and EPR spectroscopy using TEMPOL and DPPH free radicals. The changes in absorbance and in signals intensity were monitored. The experimental EPR spectra were double integrated and the

The formation and reaction of hydroxyl radicals in gamma-irradiated Metoclopramide (4-amino-5-chloro-N-[2-(diethylamino)ethyl]-2-methoxy benzamide monohydrochloride monohydrate ) and complex Fenton reaction was studied by Electron Spin Resonance spectroscopy (ESR). Specific radicals derived from purely chemical structures and reactions were detected using N-t-Butyl- α-phenylnitrone (PBN) as spin trap. Some spectroscopic properties and suggestions

Surface enhanced Raman scattering (SERS) and ATR-FTIR spectroscopy was applied in this work, in order to get information about the adsorption behavior of the title macromolecule with respect to different surfaces. In this case, the silver substrate can be considered as artificial substrate and the investigations regarding the mechanisms of adsorption can be useful in order to elucidate the active site properties of this enzyme. Our purpose is to

Structural information of barley aleurone at various temperatures is obtained by analysis of the conformationally-sensitive amide I band using FT-IR spectroscopy. The second derivative spectrum was performed in order to overcome the bands overlapping due to the different C=O stretching vibrations of each type of secondary structure (i.e. alpha-helix, beta-sheet, turns and unordered). The results of quantitative analysis by curve fitting to the inverted

The aim of the present work is to study the antioxidant characteristics of some irradiated natural extracts, like white Seaberry (Hippophae Rhamnoides) and Spirulina (Spirulina Platensis) using EPR (Electron Paramagnetic Resonance) spectroscopy technique. The methods used in this research concern the utilization of stable free radicals from nitrone classes,like nitroxide radical Tempol (2,2,6,6-tetramethyl-4 hydroxypiperidine-oxyl) and spin trap

Some varieties of grapes, namely, Burgund Mare (BMR), Cabernet-Sauvignon (CSR), Muscat-Hamburg (MHR), Merlot(MR), Merlot Dealu-Mare (MDM) from a wine production area in Romania,Recas, were investigated in order to find optimal efficiency of certain extraction procedures for satisfactory polyphenolic composition and to evaluate their antioxidant activities. Total polyphenols content of studied extracts, was determined according to Folin-Ciocalteu

Electron Paramagnetic Resonance (EPR) spectroscopy was used to study the behavior of the light-induced free radicals in the nifedipine [C17H18N2O6, 3,5-pyridine dicarboxylic acid, 1,4-dihydro-2,6-dimethyl-4-(2-nitro-phenyl)- dimethyl ester], and to characterize the specific features of these radicals. Powder samples of nifedipine were investigated for a comparison between radiation damage in drug and in active substance. The nifedipine has not EPR

The structure of xWO3 · (100 − x)[2P2O5 · PbO] glass system with 0 x 50 mol% was investigated by Raman spectroscopy. The characteristic bands of these glasses due to the stretching and bending vibrations were identified and analyzed by the increasing of WO3 content. This fact allowed us to identify the specific structural units which appear in these glasses and thus to point out the network modifier role of tungsten oxide for low concentrations