Science HOFIGAL SA

Bucharest, Romania

Science HOFIGAL SA

Bucharest, Romania

Time filter

Source Type

Pascu D.-E.,Polytechnic University of Bucharest | Nechifor A.C.,Polytechnic University of Bucharest | Pascu M.,Science HOFIGAL S.A. | Traistaru G.A.,Science ENECO Consulting S.R.L | And 3 more authors.
Revista de Chimie | Year: 2015

In the literature, the kinetics of the adsorption process is described by the help of mathematical models, which attempt to approximate as closely as possible the process' mechanism. In this study, for modelling were chosen two dynamic models namely: Thomas model and Yoon-Nelson model. It was pursued the investigation of nitrate, sulphate, chloride and phosphate ions in aqueous solutions in a dynamic flow(flowthrough) adsorption process, an adsorbent material made of a composite membrane. It was aimed to establish an optimum ratio between the adsorbent material and solution volume for each pollutant separatelly.


Segarceanu M.,Polytechnic University of Bucharest | Pascu D.E.,Polytechnic University of Bucharest | Traistarif G.A.,Science ENECO Consulting S.R.L | Pascu M.,Polytechnic University of Bucharest | And 3 more authors.
Revista de Chimie | Year: 2014

In this paper we studied the optimization of the process parameters of membranes. We studied four ions: nitrate, sulfate, chloride and phosphate. The results of the experimental study were processed using the following mathematical models: Langmuir, Freundlich and Temkin - Pyzhev. The four ions were microfiltered through a composite membrane with pores of different sizes (0.1 μm and 0.5 μm). The four ions analyzed were: nitrates, sulfates, phosphates and chlorides. To determine these, ions were used together with spectrophotometric and titrimetric methods. Experiments were conducted at three different temperatures: 288K, 308K, 328k. The sorption parameters and the fitting of the models were determined by nonlinear regression and then discussed. Wastewaters containing these ions were filtered through polysuifone! polyaniiine (PSf/PANI) membrane composites. The morphological characterization of the membrane was performed using scanning electron microscopy SEM and the stmctural characterization was performed using infrared spectroscopy (FT-IR). The best results were obtained using the Langmuir model for nitrate ions and Temkin- Pyzheu for chloride ions. The following parameters for each ion in part were: initial ion concentration, solution pH, working adsorption capacity, size and thickness of the composite membrane and temperature. The best results for the adsorption capacity were obtained with 0.1pm composite membranes for nitrate and sulfate ions.


Untea A.E.,Institute for Biology and Animal Nutrition IBNA Balotesti | Criste R.D.,Institute for Biology and Animal Nutrition IBNA Balotesti | Vladescu L.,University of Bucharest | Tamas V.,Science Hofigal SA | And 2 more authors.
Romanian Biotechnological Letters | Year: 2016

The decrease of some trace minerals (Cu, Fe, Mn, Zn) concentration in faeces from weaned piglets, by partially replacing the inorganic forms of trace minerals in the diet with a botanical mix: Jerusalem artichoke, (Helianthus tuberosus) and buckthorn (Hippophae rhamnoides), was studied. Two experiments were conducted: a mineral balance experiment performed on piglets housed in metabolic cages and a second one involving piglets housed under farm conditions. The piglets were assigned to 2 groups for each experiment (CB and EB for the balance experiment; CF and EF for the farm experiment), housed in individual metabolic cages, respectively in collective pens, fed on corn-soybean meal-based diets. The diet of the C groups included 1% inorganic mineral premix and contained 25 mg.kg-1Cu. The diet of the E groups included 3% botanical mix and mineral premix having 50% less Cu, Fe, Zn, Mn salts. The experimental data show that, the 50% reduction of the minerals included in the premix for E groups, decreased significantly (P≤0.05) the trace elements concentration in excreta. The coefficients of apparent absorption of the minerals were comparable between CB and EB. At the end of experiments (d 26) the values of trace elements concentrations in the main organs of storage (liver, spleen) were comparable between groups. © 2016 University of Bucharest.


Bunaciu A.A.,Science HOFIGAL SA | Aboul-Enein H.Y.,Pharmaceutical and Drug Industries Research Division | Fleschin S.,University of Bucharest
Applied Spectroscopy Reviews | Year: 2012

Abstract: Fourier transform infrared spectroscopy (FTIR) is a fast and nondestructive analytical method. Associated with chemometrics, it is a powerful tool for research and industry. The present review discusses the antioxidant activities assay of some plants (fruits, leaves, aerian part) with medicinal properties using an FTIR spectrophotometric method in comparison with other ultraviolet-visible (UV-Vis) spectrophotometric methods. A good correlation was found between the different methods used for measuring the antioxidant capacity of some of these herbs. © 2012 Copyright Taylor and Francis Group, LLC.


Pascu D.-E.,University of Bucharest | Pascu M.,University of Bucharest | Pascu M.,Science Hofigal S.A. | Traistaru G.A.,Science Eneco Consulting S.R.L | And 3 more authors.
Revista de Chimie | Year: 2015

In this paper we intended to study the ability of iron adsorption from drinking water by two types of membranes: cellulose and composite. Adsorption studies were highlighted by means of adsorption isotherms: Langmuir, Freundlich, Flory-Huggins and Frumkin. The results revealed that iron adsorption was influenced by pH increase. The identification of iron in drinking water was done using two methods: spectrophotometry method and potentiometric redox titration with cerium sulphate method. The adsorption capacity of composite membrane increased when temperature was increased. Spectrophotometry method has proved to be better than potentiometric redox titration with cerium sulphate method. After 150 min was recorded the total iron removal from aqueous solution using the composite membrane. The pH value influenced significantly the adsorption capacity. As the pH increased, the adsorption capacity for both membranes decreased.


Al-Sabha T.N.,University of Mosul | Bunaciu A.A.,Science HOFIGAL SA | Aboul-Enein H.Y.,National Research Center of Egypt
Applied Spectroscopy Reviews | Year: 2011

The H-point standard addition method (HPSAM) is a modification of the standard addition method that transforms the incorrigible error resulting from the presence of a direct interferent in the determination of an analyte into a constant systematic error. This error can then be evaluated and eliminated. The method was established for resolving strongly overlapping spectra of two analytes and permits both proportional and constant errors produced by the matrix of the sample to be corrected directly. The technique is based on the principle of dual-wavelength spectrophotometry and the standard addition method. The application of the method requires only two wavelengths, and the analytical signal caused by one of the species should be constant and that of the other should differ as much as possible. This overview discusses both the theoretical and practical aspects of HPSAM applications. © 2011 Copyright Taylor and Francis Group, LLC.


Pascu M.,Science HOFIGAL S.A. | Pascu M.,Polytechnic University of Bucharest | Pascu D.-E.,Polytechnic University of Bucharest | Traistaru G.A.,Science HOFIGAL S.A. | And 3 more authors.
Journal of the Iranian Chemical Society | Year: 2014

The present study investigates the antioxidant activities of some Romanian plants, using different spectrophotometric methods (FRAP I, FRAP II, and CUPRAC). The plants investigated are hawthorn (Crataegus oxyacantha), bilberry (Vaccinium myrtillus L.), rosehip (Rosa canina), and chokeberries (Aronia melanocarpa). Hawthorn is used to treat a wide variety of inflammatory conditions, but the primary use is generally restricted for treating hypertension, ischemic heart disease, congestive heart failure, and arrhythmia. Investigations have proved the safe and reliable use of plant and plant extracts for treatment of cardiovascular disorders. © 2013 Iranian Chemical Society.


Pascu M.,Science HOFIGAL S.A. | Pascu M.,Polytechnic University of Bucharest | Pascu D.-E.,Polytechnic University of Bucharest | Cozea A.,Science HOFIGAL S.A. | And 4 more authors.
Applied Surface Science | Year: 2015

This paper is aimed to select plant materials rich in bioflavonoid compounds, made from herbs known for their application performances in the prevention and therapy of renal diseases, namely kidney stones and urinary infections (renal lithiasis, nephritis, urethritis, cystitis, etc.). This paper presents a comparative study of the medicinal plant extracts composition belonging to Ericaceae-Cranberry (fruit and leaves) - Vaccinium vitis-idaea L. and Bilberry (fruit) - Vaccinium myrtillus L. Concentrated extracts obtained from medicinal plants used in this work were analyzed from structural, morphological and compositional points of view using different techniques: chromatographic methods (HPLC), scanning electronic microscopy, infrared, and UV spectrophotometry, also by using kinetic model. Liquid chromatography was able to identify the specific compounds of the Ericaceae family, present in all three extracts, arbutosid, as well as specific components of each species, mostly from the class of polyphenols. The identification and quantitative determination of the active ingredients from these extracts can give information related to their therapeutic effects. © 2015 Elsevier B.V. All rights reserved.


Pascu D.E.,Polytechnic University of Bucharest | Pascu M.,Polytechnic University of Bucharest | Pascu M.,Science Hofigal S.A. | Segarceanu M.,Polytechnic University of Bucharest | And 2 more authors.
Revista de Chimie | Year: 2016

The work consists in studying the kinetics of aluminum ion adsorption from drinking water on two types of membranes: cellulose and composite. The two types of membranes are characterized by: pore shape (cylindrical) and pore size (40 μm). In this study there has been carried out a comparison of the adsorption capacities of the two membranes types. Also, the influence of the main operational parameters (temperature, concentration and membrane type), adsorption capacity variation has been tracked in this study. The experimental data were processed and interpreted using the following mathematical models: Morris-Weber, Lagergren, Elovich, pseudo second order model Ho & Mckay.


Nechifor G.,Polytechnic University of Bucharest | Pascu M.,Polytechnic University of Bucharest | Pascu M.,Science HOFIGAL S.A. | Pascu D.E.,Polytechnic University of Bucharest | And 2 more authors.
UPB Scientific Bulletin, Series B: Chemistry and Materials Science | Year: 2014

This paper presents the physical-chemical analysis of the extracts from some indigenous medicinal fruits for their added value in phytotherapy for heart disease (preparation-food suplements), for improving the blood circulation. The studied fruits were: Chokeberry (Aronia melanocarpa), Rosehip (Rosa canina), Bilberry (Vaccinium myrtillus) and Hawthorn (Crateagus monogyna), with high content in antioxidant compounds. The main compounds studied compared in this paper are: flavones, phenols and anthocyanins. The fruit extracts studied are an important source of antioxidants.

Loading Science HOFIGAL SA collaborators
Loading Science HOFIGAL SA collaborators