Erika Maria Vági

Erika Maria Vági
Budapest University of Technology and Economics · Department of Chemical and Environmental Process Engineering

PhD

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21
Publications
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857
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Publications

Publications (21)
Article
Full-text available
The integrated supercritical fluid extraction–impregnation process (SFE-SSI) was performed to fabricate material with antiviral properties against the herpes simplex virus (HSV). Cotton gauze and starch/chitosan polymer films (SCF) were impregnated with components extracted from Melissa officinalis at 10 MPa and 40 ◦C using a green medium, supercri...
Article
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Dry pomegranate peel was extracted with acetone and the extract was added to a Phillips type polyethylene. The concentration of the extract was changed from 0 to 1000 ppm in six steps and stabilization efficiency was checked by the multiple extrusion of the polymer followed by the characterization of chemical structure, processing, and residual sta...
Article
The first semi-continuous Pressurized Liquid Extraction (PLE) of hemp threshing residue with ethanol was carried out according to a 32 full factorial experimental design with pressure and temperature as independent variables at 8-10-12 MPa and 323-333-343 K, respectively. The total- and cannabidiol (CBD) yield curves were fitted to the modified two...
Article
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Active components with antioxidant activity were extracted from the powder of pomegranate peel and added to polyethylene at 1000 ppm. The stabilization effect of the extract was studied also in compounds containing a phosphorous secondary antioxidant. A commercial hindered phenolic antioxidant with and without a secondary stabilizer was used as ref...
Article
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Cannabidiol (CBD) and cannabidiolic acid (CBDA)- rich extracts were obtained from industrial hemp threshing residues by sub- and supercritical carbon dioxide extraction. The supercritical CO2 extraction yielded 2.5 - 9.2 g/100 g of lipophilic raw extracts containing 0.2 – 1.8 g of cannabinoids per 100 g of various threshing residues. Carrying out t...
Article
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Obtaining phytocannabinoids, associated with various medicinal and therapeutic properties with no reported side effects, is one of the hot topics. The phychotropic?9-tetrahydrocannabinol (THC) is less than 0.2 % in industrial cultivars therefore can be grown legally in many EU countries. Harvesting and processing of hemp for fiber or seeds generate...
Article
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Supercritical fluids are increasingly being used and promoted at a laboratory and pilot scale to produce high value, natural bioactives from biologically based raw materials. Supercritical CO2 is overwhelmingly the solvent of choice for these operations, but is largely limited to the processing of dry raw materials and the extraction of low polarit...
Article
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The state-of-the-art and progress achieved in the extraction and fractionation of selected specialty lipids using near critical fluids is briefly reviewed, and opinions are provided on what is still to be achieved, and future directions for further research and development. The selected specialty lipids are high value seed oils, polyunsaturated fat...
Article
The effects of supercritical fluid extraction (SFE) conditions (pressure and temperature) on extraction yield and recoveries of biologically active components were studied using a 32 full factorial design. Pilot plant SFE experiments were performed in a 5×10−3m3 volume high-pressure vessel. The pressure and temperature were varied over the ranges o...
Article
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The ATPase assay using membrane preparations from recombinant baculovirus-infected Spodoptera frugiperda ovarian (Sf9) cells is widely used to detect the interaction of compounds with different ATP-binding cassette transporters. However, Sf9 membrane preparations containing the wild-type ABCG2 transporter show an elevated baseline vanadate-sensitiv...
Article
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In this work the supercritical carbon dioxide extraction of biologically active, high valued compounds such as carotenoids (lycopene, β-carotene), tocopherols, fatty acids and sitosterols from industrial tomato waste was investigated. The differences of two samples of different sources and the effect of air-dried and deep-frozen storages were also...
Article
The different methods of making herbal tea used in various cultures may decrease the efficiency of herbal tea, therefore the purpose of the present study was to examine the changes in antioxidant activity and metal ion concentration in aqueous extracts of "Tieguanyin Stomach Tea" obtained with different steeping times. Partial phytochemical examina...
Article
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Antioxidant properties of marjoram (Origanum majorana L.) herb and extracts obtained with ethanol, n-hexane, and supercritical CO2 extraction are presented. Individual antioxidants, ursolic acid, carnosic acid, and carnosol, were quantified with high-performance liquid chromatography. The effects of different parameters (temperature and pressure) o...
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Volatile components of marjoram (Origanum majorana L.) essential oil obtained by hydrodistillation and extracts obtained by solvent extraction with ethyl alcohol and supercritical fluid extraction (SFE) were investigated. The compositions of volatile compounds in essential oil, ethanolic and SFE extracts were determined by GC and GC–MS. The antimic...
Article
Extraction of pigments (chlorophylls and carotenoids) from marjoram (Origanum majorana L.) with supercritical carbon dioxide was investigated. The aim of this study was to map the effects of extraction pressure and temperature on the yield of coloring materials by applying a 3(2) full factorial design with three repeated tests in the center of the...
Article
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INTRODUCTION Quercetin is an anticarcinogenic flavonoid mostly present in the form of ester, glycosides, or polymers in food such as onions, broccoli, blueberries, tea and red wine. During metabolism, quercetin is subjected to three major conjugations: methylation, sulfation, and glucuronidation, which modify its biological activity. One of the fac...

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