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Your search keyword '"Corici, Livia"' showing total 4 results
Start Over Author "Corici, Livia" Topic lipase
4 results on '"Corici, Livia"'

1. ENTRAPMENT OF LIPASES IN NOVEL SOL-GEL SYSTEMS.

Author

TOMIN, ANNA, WEISER, DIÁNA, BATA, ZSÓFIA, CORICI, LIVIA, PÁTER, FERENC, and POPPE, LÁSZLÓ

Subjects
LIPASES, INDUSTRIAL enzymology, ORGANIC synthesis, CATALYSIS, PSEUDOMONAS, GRAM-negative bacteria
Abstract

Lipases are the most widely used enzymes in synthetic organic chemistry. The search for efficient methods for immobilization of enzymes has emerged an important field of interest in order to increase their activity, stability and to facilitate their recovery because of the industrial application of lipases. In this study, the lipase immobilization by entrapment in sol-gel matrices was investigated to study the effect of enzymes, supports and enzyme/support ratios. [ABSTRACT FROM AUTHOR]

Published
2009

2. Turning biomass into functional composite materials: Rice husk for fully renewable immobilized biocatalysts

Author

Nicola Cefarin, Gilda Savonitto, Anamaria Todea, Mariachiara Spennato, Lucia Gardossi, Fioretta Asaro, Livia Corici, Caterina Deganutti, Spennato, Mariachiara, Todea, Anamaria, Corici, Livia, Asaro, Fioretta, Cefarin, Nicola, Savonitto, Gilda, Deganutti, Caterina, and Gardossi, Lucia

Subjects
Technology, Biomass, Economic growth, development, planning, Laccases, Reuse, engineering.material, Environmental protection, Husk, Laccase oxidation of cellulose, Biocatalysis, bioeconomy, Covalentimmobilization, lipases, Rice husk, chemistry.chemical_compound, Coating, TD169-171.8, lipase, Cellulose, Laccase, Renewable immobilization carriers, food and beverages, Biocatalysi, Covalent immobilization of lipases, Biocatalysis for bioeconomy, chemistry, Chemical engineering, Fluidized bed, HD72-88, engineering, Glutaraldehyde
Abstract

Rice husk is an underexploited, low density and highly robust composite material, massively available from rice processing. Here we report two new procedures for the formulation of immobilized lipases applicable in fats and oils transformations. The enzymes were covalently anchored on aldehyde groups introduced on rice husk by laccase-catalysed oxidation of the cellulose component. The method avoids the use of toxic glutaraldehyde while allows for the application and recycling of the biocatalysts in aqueous media. The second method used a fluidized bed granulator for the coating of the particles of rice husk (200–400 μm) in the presence of water-soluble binders. The formulations are mechanically stable and suitable for applications in different hydrophobic media. Both methods allow for the recovery and reuse of the rice husk at the end of the life cycle of the biocatalysts.

Published
2021

3. Fine-tuning the second generation sol–gel lipase immobilization with ternary alkoxysilane precursor systems

Author

Tomin, Anna, Weiser, Diana, Hellner, Gabriella, Bata, Zsófia, Corici, Livia, Péter, Francisc, Koczka, Béla, and Poppe, László

Subjects
*IMMOBILIZED enzymes, *PSEUDOMONAS, *LIPASES, *COMPARATIVE studies, *PARAMETER estimation, *SURFACE chemistry
Abstract

Abstract: The sol–gel immobilization of Celite-supported lipase from Pseudomonas fluorencens (Lipase AK) was systematically studied using ternary silane precursor systems consisting of alkyltriethoxysilane (alkylTEOS), phenyltriethoxysilane (PhTEOS) and tetraethoxysilane (TEOS). The parameters investigated were the surface coverage at various enzyme-Celite ratios (between 1:1 and 1:10) and the effect of molar ratio of alkylTEOS (alkyl=propyl, hexyl, octyl, 1H,1H,2H,2H-perfluorooctyl, decyl, dodecyl, octadecyl), PhTEOS and TEOS (seven series of alkylTEOS:PhTEOS:TEOS from 0.1:0.9:1 to 0.9:0.1:1 in 0.1 steps) on the catalytic properties of the sol–gel biocatalysts. For comparison, the corresponding binary systems (1:1 molar ratios of alkylTEOS:TEOS and PhTEOS:TEOS) were also studied. The ternary and binary sol–gel lipase preparations were evaluated by their catalytic behavior in enantiomer selective acetylation of racemic 1-phenylethanol and 2-heptanol. For each alkylTEOS precursor, one or more alkylTEOS/PhTEOS/TEOS ternary systems were superior biocatalysts compared to the corresponding alkylTEOS/TEOS preparations. The best overall results were achieved with the medium-chain octylTEOS and perfluorooctylTEOS-containing ternary systems. [ABSTRACT FROM AUTHOR]

Published
2011
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4. Large scale applications of immobilized enzymes call for sustainable and inexpensive solutions: rice husks as renewable alternatives to fossil-based organic resins

Author

Alessandro Pellis, Sara Cantone, Lucia Gardossi, Dario Voinovich, Simone Lotteria, Cynthia Ebert, Valerio Ferrario, Livia Corici, Corici, Livia, Ferrario, Valerio, Pellis, Alessandro, Ebert, Cynthia, Lotteria, Simone, Cantone, Sara, Voinovich, Dario, and Gardossi, Lucia

Subjects
biocatalysis, Immobilized enzyme, General Chemical Engineering, Biomass, Lignocellulosic biomass, 02 engineering and technology, polyesters, 7. Clean energy, 01 natural sciences, 12. Responsible consumption, biocatalysi, lipase, green chemistry, enzyme immobilization, bioeconomy, biomass, rice husk, polyester, 010405 organic chemistry, business.industry, Scale (chemistry), Industrial scale, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Renewable energy, Process conditions, Biochemistry, 13. Climate action, Sustainability, bioma, Biochemical engineering, 0210 nano-technology, business
Abstract

Despite the extensive efforts of the scientific community towards the development of a vast variety of immobilization methods, there is a limited number of immobilized biocatalysts used at an industrial scale. Most often, cost issues prevent the transfer of methodologies to large scale but more recently sustainability criteria are also becoming increasingly relevant, so that petroleum based carriers for enzyme immobilization appear unsuitable for responding to the new challenges of green and renewable chemistry. Here we report, for the first time, a preliminary overview of the potential of rice husks as carriers to be employed for both physical and covalent immobilization of enzymes. The data indicate that the chemical versatility of this lignocellulosic biomass, containing also silica, opens wide scenarios for optimizing different immobilization procedures requiring minimal pre-treatments and applicable to various enzymes and process conditions. The mechanical and chemical robustness of rice husks, along with their virtually unlimited availability worldwide, make this inexpensive natural matrix a promising candidate for replacing organic fossil-based carriers for enzyme immobilization.

Published
2016

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