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RISS 인기검색어
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- 저자 : Adél Len (검색결과 3 건)
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Lívia Darnay,Adél Len,Ágota Koncz,László Friedrich,László Rosta 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.6
Small angle neutron scattering (SANS) studies of fermentation of bovine milk with and without microbial transglutaminase (mTG) are described. Use of mTG increased the quality of low-fat yogurt via cross-linking of milk proteins. The SANS method was suitable for simultaneous characterization of the fermentation process and the effect of mTG. A decrease of whey protein release into the supernatant of centrifuged low-fat yogurt samples showed how mTG was capable to cross-link them already after 1 h of fermentation. The applied SANS method can be used to follow the sol-gel transformation of fermented dairy products in general. Moreover it can be a special tool for detecting the activity of mTG during fermentation of low-fat yogurts.
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Ultrasonic preparation of mesoporous silica using pyridinium ionic liquid
László Almásy,Ana-Maria Putz,Adél Len,Catalin Ianăşi,Cecilia Savii 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.3
Mesoporous silica matrices have been prepared via classic acid catalyzed and sono-catalyzed sol-gel routes. Tetramethoxysilan (TMOS) and methyl-trimethoxysilane (MTMS) were used as silica precursors, and N-butyl-3-methylpyridinium tetrafluoroborate ([bmPy][BF4]) was employed as co-solvent and pore template. The ionic liquid (IL) to silica mole ratio was varied between 0.007 and 0.07. Nitrogen adsorption-desorption and small-angle neutron scattering measurements were used to characterize the obtained materials. The ionic liquid played the role of catalyst that affected the formation of the primary xerogel particles, and changed the porosity of the materials. Ultrasound treatment resulted in microstructure change on the level of the colloid particle aggregates. In comparison with IL containing xerogels, the IL containing sonogels show increased pore diameter, bigger pore volumes and diminished surface areas.
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Removal of cadmium from aqueous solutions using inorganic porous nanocomposites
Cătălin Ianăşi,Mirela Picioruş,Roxana Nicola,Mihaela Ciopec,Adina Negrea,Daniel Nižňanský,Adél Len,László Almásy,Ana-Maria Putz 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.5
The present paper reports a one-pot synthesis of magnetic nanocomposites samples through acid catalyzed sol-gel method. Fe(III) acetylacetonate was used as precursor of the iron oxide phase: tetraethylortosilicate for the silica phase and polyvinyl alcohol (PVA, molecular mass 49000) as pore former. Different concentrations of Fe2O3 in composites matrices were prepared and studied ranging from 0% to 20%. All reactions took place in one pot at room temperature; the materials were subsequently heat treated at 300 oC, to ensure the crystallinity for the iron oxide having spinel structure, forming nanoparticles confined in the silica matrix. The materials were characterized using X-ray diffraction, small-angle neutron scattering, FT-IR spectroscopy, nitrogen adsorption, Mössbauer spectroscopy and magnetization measurements. The maximum value of room temperature saturation magnetization of ~54 emu/g and 0.11 kOe coercive field was achieved for the magnetic nanocomposite sample with 20% Fe2O3. The highest surface area of 680m2/g was obtained for the sample with 10% Fe2O3. The potential applicability of the obtained materials was studied for adsorption performance for cadmium in aqueous solutions. The Langmuir isotherm model described well the adsorption data, indicating monolayer adsorption of Cd(II) on the heterogeneous composite surface.
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