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Podu Iloaiei, Romania

Gherman S.,Grigore T. Popa University of Medicine and Pharmacy | Zavastin D.,Grigore T. Popa University of Medicine and Pharmacy | Spac A.,Grigore T. Popa University of Medicine and Pharmacy | Mircea C.,Grigore T. Popa University of Medicine and Pharmacy | And 3 more authors.
Revista de Chimie | Year: 2015

A simple, rapid and sensitive capillary electrophoresis (CE) technique for the determination of Enalapril was developed and validated. The influence of buffer pH, buffer concentration, capillary temperature, applied voltage and injection time was investigated in a fused silica capillary (50 cm× 50 μm ID). Detection wavelength was set at 214 nm. Optimum results were found with 0.067 M phosphate buffer at pH 7.0, capillary temperature 25°C and applied voltage 25 kV. The samples were injected hydrodynamically for 10 s at 35 mbar. The proposed method was validated by testing linearity, precision, accuracy, recovery, detection limit and quantification limit. The method presented a good linearity in the concentration range 10-100 μg/ml and the correlation coefficient was r = 0.9994. The relative standard deviation (RSD) for the precision system was 0.3864 %. The RSD value for the within-day and between-day precision was 1.7880 % and 1.8590 % respectively. The limit of detection (LOD) was 2.43 μg/mL and the limit quantification (LOQ) was 7.38 μg/mL. The percentage of recovery of the Enalapril was 100.91 %. The method was successfully applied to the quantitative determination of Enalapril from pharmaceutical forms. Source

Orbecp C.,Polytechnic University of Bucharest | Pascu L.F.,INCD ECOIND Bucharest | Modrogan C.,Polytechnic University of Bucharest
Revista de Chimie | Year: 2015

This paper presents an experimental study focused on the degradation of an industrial pharmaceutical effluent through advanced oxidation processes. In the present study, two procedures (Fenton and photo- Fenton) were applied to the degradation of organic compounds from the pharmaceutical effluent; these are focused on the influence of the operational parameters on the efficiency of the oxidation of the organic compounds from the effluent and determining the optimal operating conditions in view to obtain a greater process performance. The degradation process was studied by monitoring the changes in the organic substrate concentration using chemical oxygen demand (COD), total organic carbon (TOC) and high-performance liquid chromatography (HPLC) analyses. The results suggest that the techniques applied could be used to remove organic compounds from industrial pharmaceutical effluent. Source

Rikabi A.A.K.K.,Polytechnic University of Bucharest | Rikabi A.A.K.K.,Al-Furat University | Cuciureanu A.,INCD ECOIND Bucharest | Chelu M.,Polytechnic University of Bucharest | And 5 more authors.
Revista de Chimie | Year: 2015

In this paper are presented the results of bovine serum albumin (BSA) aqueous solutions ultrafiltration using composite membranes based on polysulfone (PSf), polyaniline (PANI) or magnetite nanoparticles (NM). Operating the protein solutions ultrafiltration at 5 bars, pH 4.9 and 7.4, at BSA concentrations of 1 g/L and 1.5 gl / were obtained the results regarding specific permeate flow ranging from 80 to 110 L/m2 × h and retentions between 85 and 99%. Flow-retention results are the best for PSf-PANI composite membrane, and regarding the retention PSf-NM composite membrane is superior to PSf membrane at the same permeate now. Along with increasing protein concentration in the feed, flow slightly decreases, while retention increases with 1 to 3 units reaching ideal retention threshold (98%). Source

Dabuleanu I.,University of Craiova | Dumitru M.G.,University of Craiova | Pascu L.F.,INCD ECOIND Bucharest | Reiss A.,University of Craiova
Revista de Chimie | Year: 2015

The consumption of plant nutrients is often very high, especially for vegetables, and especially those grown in protected systems. The use of fertilizers in order to assure the nutritional needs of plants is a very widely tool used in agriculture. This study is based on the effect of the fertilizer obtained from 0.1 % humic acids, 1 % calcium chloride, 1 % zinc sulfate, 0.1 % boron and 1% galactomannans extracted from the seeds of Gleditsia triacanthos on a culture of Prekos variety tomatoes which was nursed in a protected space. The fertilizer was applied on the leaves of the tomato culture in a concentration of 10 mL/L at 4 weeks after planting, in four stages and an interval of 10 days. The effect of the bio fertilizer on the content of total polyphenols, flavonoids and rutin has been studied by measurements made on tomatoes fruits which were harvested at physiological maturity, and selected according to their firmness, without bumps or visible degradation. The content of total polyphenols from fertilized samples showed values of350 mg/100 g fresh product and the unfertilized samples had the value of 110 mg/100 g fresh product. The content of total flavonoids was also different from 53.1 mg/100 g fresh product for the fertilized samples as compared to 22.5 mg/100 g fresh product for the unfertilized samples. The rutin concentration was 3.24 times higher in the fertlized samples as compared to the unfertilized samples. Source

Stroia A.,Polytechnic University of Bucharest | Covaliu C.,Polytechnic University of Bucharest | Oprea O.,Polytechnic University of Bucharest | Pascu L.F.,INCD ECOIND Bucharest | Jitaru I.,Polytechnic University of Bucharest
Revista de Chimie | Year: 2015

Synthesis of a Pd/Ag nanopowder was achieved by reduction of tetraaminopalladium(II) sulphate with formic acid in the presence ofmacroporous granular silver support. The product was characterized by chemical and structural analyses as: inductively coupled plasma-mass spectroscopy (ICP-MS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM). The nanomaterial may have potential electrochemical and/or catalytic applications, being a more economical alternative to pure palladium nanoparticles due to high silver content. Source

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