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[579.22+663.2]:54.06 (1) |
General microbiology (132) |
Wine. Winemaking. Oenology (442) |
Analysis, investigation and handling in general (25) |
SM ISO690:2012 CEBAN (GÎNSARI), Irina, NASTAS, Raisa, LUPASCU, Tudor. Adsorption of p-coumaric acid on oenological activated carbons. In: Ecological and environmental chemistry : - 2022, Ed. 7, 3-4 martie 2022, Chișinău. Chisinau: Centrul Editorial-Poligrafic al USM, 2022, Ediția 7, Vol.1, p. 176. ISBN 978-9975-159-07-4.. 10.19261/eec.2022.v1 |
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Ecological and environmental chemistry Ediția 7, Vol.1, 2022 |
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Conferința "Ecological and environmental chemistry 2022" 7, Chișinău, Moldova, 3-4 martie 2022 | |||||||
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CZU: [579.22+663.2]:54.06 | |||||||
Pag. 176-176 | |||||||
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Phenolic substances have been reported as being responsible for wine colour, mouthfeel perception and flavour. From the phenolic compounds, the p-coumaric acid is of great interest because in wines its bioconversion by Brettanomyces sp. Into ethylphenols damages the quality product. Nowadays, activated carbons have great applicability in the conditioning of wines: discoloration, removal of foreign taste and smell, correction of organoleptic parameters, etc. The purpose of this work was to perform adsorption experiments of p-coumaric acid from water solutions on two activated carbons: (i) commercial activated carbon FA (Granucol, Germany) and (ii) of local origin ones AC-C, obtained from apricot stones (Republic of Moldova). The adsorption kinetics of p-coumaric acid from solution on activated carbons was studied at different initial concentrations (1, 3, 4.5 mM), at a solid/liquid ratio of 1/1000, for 4-6 hours of contacting. For both activated carbons studied (FA, AC-C), the adsorption equilibrium of p-coumaric acid is established in 1-2 hours. At the same time, in the first 10-15 minutes of contact, about 70% of the total amount of p-coumaric acid is absorbed. The adsorption capacity of the studied activated carbons (FA, AC-C) for p-coumaric acid was determined from the adsorption isotherms, constituting 1.8 and 2.5 mmol/g for FA and AC-C, respectively. The obtained experimental results were analyzed by applying the kinetic models: pseudo-first order model, pseudo-second order model and intraparticle diffusion model, as well as theoretic isotherms models of Langmuir, Freundlich, Temkin-Pyzhev and Dubinin-Radushkevich. The experimental data are best described by the pseudo-second kinetic model and Langmuir model suggesting that the adsorption of p-coumaric acid onto activated carbons is based on chemisorption. |
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