Odor-active compound adsorption onto bentonite in a model white wine solution.

Milena Lambri, Roberta Dordoni, Angela Silva, Dante Marco De Faveri

Risultato della ricerca: Contributo in libroContributo a convegno

20 Citazioni (Scopus)

Abstract

This work extends the concepts proposed in a previous research paper about the interaction between the aroma of two white wines and bentonites. Such previous results led to hypothesized that some odor-active compounds were removed through direct adsorption mechanism on the clays. As a consequence, this paper examined the adsorption isotherms at 17±1°C of three bentonite samples added in three different amounts to a model white wine without the presence of wine macromolecule. The clays were analyzed for the elemental composition, the surface charge density, and the specific surface area (SSA) and differences were analyzed by Tukey’s test. The analysis of variance (ANOVA) was used to demonstrate the significance of the bentonite on the aroma reduction. The Langmuir and the Freundlich models were fitted to the adsorption data. The most experimental adsorption isotherms were robustly fitted by the Freundlich equation indicating that, under the condition of the study, the adsorption process more frequently occurred with a heterogeneous energy distribution of an infinite number of surface active sites. Overall, the modeling prediction ability tested by the error on r2 in cross validation enhanced differences both among the odor-active compounds and among the clays. Samples having a lower SSA value and a greater charge density per surface unit seemed to interact with most of the odor-active compounds primarily through physical mechanisms. Differently, the clay with a large SSA value and a low charge density per surface unit promoted stronger adsorptions that were probably driven by chemical interactions especially for ethyl esters. For the tested odor-active compounds differences in the adsorption intensity and capacity depended mainly on the bentonite characteristics rather than on the properties of the substances.
Lingua originaleEnglish
Titolo della pubblicazione ospiteACOS - AIDIC Conference Series
Pagine201-210
Numero di pagine10
DOI
Stato di pubblicazionePubblicato - 2013
EventoACOS - AIDIC Conference Series, Vol XI, 2013 - selected pspers of ICheaP-ll Proceedìngs' (1lth International Conference on Chemical and Process Engineering) by AIDIC Servizi S.r.l. - Milano
Durata: 2 giu 20135 giu 2013

Serie di pubblicazioni

NomeAIDIC CONFERENCE SERIES

Convegno

ConvegnoACOS - AIDIC Conference Series, Vol XI, 2013 - selected pspers of ICheaP-ll Proceedìngs' (1lth International Conference on Chemical and Process Engineering) by AIDIC Servizi S.r.l.
CittàMilano
Periodo2/6/135/6/13

Keywords

  • adsorption
  • bentonite
  • model wine
  • odor-active compound

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