title: Selective adsorption of flavor-active components on hydrophobic resins.
abstract: This work aims to propose an optimum resin that can be used in industrial adsorption process for tuning flavor-active components or removal of ethanol for producing an alcohol-free beer. A procedure is reported for selective adsorption of volatile aroma components from water/ethanol mixtures on synthetic hydrophobic resins. High throughput 96-well microtiter-plates batch uptake experimentation is applied for screening resins for adsorption of esters (i.e. isoamyl acetate, and ethyl acetate), higher alcohols (i.e. isoamyl alcohol and isobutyl alcohol), a diketone (diacetyl) and ethanol. The miniaturized batch uptake method is adapted for adsorption of volatile components, and validated with column breakthrough analysis. The results of single-component adsorption tests on Sepabeads SP20-SS are expressed in single-component Langmuir, Freundlich, and Sips isotherm models and multi-component versions of Langmuir and Sips models are applied for expressing multi-component adsorption results obtained on several tested resins. The adsorption parameters are regressed and the selectivity over ethanol is calculated for each tested component and tested resin. Resin scores for four different scenarios of selective adsorption of esters, higher alcohols, diacetyl, and ethanol are obtained. The optimal resin for adsorption of esters is Sepabeads SP20-SS with resin score of 87% and for selective removal of higher alcohols, XAD16N, and XAD4 from Amberlite resin series are proposed with scores of 80 and 74% respectively. For adsorption of diacetyl, XAD16N and XAD4 resins with score of 86% are the optimum choice and Sepabeads SP2MGS and XAD761 resins showed the highest affinity towards ethanol.
authors.affiliation: Delft University of Technology, Department of Biotechnology, Julianalaan 67, 2628 BC Delft, The Netherlands.
authors.forename: Shima
authors.initials: S
authors.lastname: Saffarionpour
authors.affiliation: Delft University of Technology, Department of Biotechnology, Julianalaan 67, 2628 BC Delft, The Netherlands.
authors.forename: David Mendez
authors.initials: DM
authors.lastname: Sevillano
authors.affiliation: Delft University of Technology, Department of Biotechnology, Julianalaan 67, 2628 BC Delft, The Netherlands.
authors.forename: Luuk A M
authors.initials: LA
authors.lastname: Van der Wielen
authors.affiliation: Heineken Supply Chain, Burgemeester Smeetsweg 1, 2382 PH, Zoeterwoude, The Netherlands.
authors.forename: T Reinoud
authors.initials: TR
authors.lastname: Noordman
authors.affiliation: Heineken Supply Chain, Burgemeester Smeetsweg 1, 2382 PH, Zoeterwoude, The Netherlands.
authors.forename: Eric
authors.initials: E
authors.lastname: Brouwer
authors.affiliation: Delft University of Technology, Department of Biotechnology, Julianalaan 67, 2628 BC Delft, The Netherlands. Electronic address: m.ottens@tudelft.nl.
authors.forename: Marcel
authors.initials: M
authors.lastname: Ottens
mesh_terms: D000327:Adsorption; D000440:Butanols / Q000737:chemistry; D003931:Diacetyl / Q000737:chemistry; D000431:Ethanol / Q000737:chemistry; D005421:Flavoring Agents / Q000737:chemistry*; D005524:Food Technology; D057927:Hydrophobic and Hydrophilic Interactions; D000439:Pentanols / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D000440:Butanols; D005421:Flavoring Agents; D000439:Pentanols; D012117:Resins, Synthetic; D014867:Water; D000431:Ethanol; C040507:isobutyl alcohol; C046797:amberlite; C029683:isopentyl alcohol; D003931:Diacetyl
keywords: Adsorption; Column breakthrough analysis; High throughput experimentation; Isotherm model; Multi-component adsorption; Resin selection