In bottled wines, haze and turbidity are phenomena to be avoided. Since bentonite fining is a common process to clarify wines removing heat unstable proteins, a theoretical study on the adsorption of three Charged Model Molecules (CMMs, egg albumin, polyphenols and riboflavin) was carried out to deep comprehend this chemical phenomenon. Four bentonites were adopted and finely characterized together with the potential release of Na+ and Ca2+ cations, revealing suitable for RT albumin removal within 120 min. Better results in terms of adsorbed quantity were achieved by adopting 12%v/v EtOH/H2O solvent and by swelling bentonites for 24 h before use. With the most performing sample (Na/Ca_0.27), a comprehensive study on simultaneous adsorption of the three CMMs was performed, resulting in polyphenols adsorption increase due to their interactions with albumin. Notwithstanding the majority of albumin and riboflavin was successfully removed, ca. 40–50% of tested poly- phenols was preserved.

A comprehensive study on the effect of bentonite fining on wine charged model molecules / E. Pargoletti, L. Sanarica, M. Ceruti, F. Elli, C. Pisarra, G. Cappelletti. - In: FOOD CHEMISTRY. - ISSN 0308-8146. - 338(2021 Feb 15). [10.1016/j.foodchem.2020.127840]

A comprehensive study on the effect of bentonite fining on wine charged model molecules

E. Pargoletti;G. Cappelletti
2021-02-15

Abstract

In bottled wines, haze and turbidity are phenomena to be avoided. Since bentonite fining is a common process to clarify wines removing heat unstable proteins, a theoretical study on the adsorption of three Charged Model Molecules (CMMs, egg albumin, polyphenols and riboflavin) was carried out to deep comprehend this chemical phenomenon. Four bentonites were adopted and finely characterized together with the potential release of Na+ and Ca2+ cations, revealing suitable for RT albumin removal within 120 min. Better results in terms of adsorbed quantity were achieved by adopting 12%v/v EtOH/H2O solvent and by swelling bentonites for 24 h before use. With the most performing sample (Na/Ca_0.27), a comprehensive study on simultaneous adsorption of the three CMMs was performed, resulting in polyphenols adsorption increase due to their interactions with albumin. Notwithstanding the majority of albumin and riboflavin was successfully removed, ca. 40–50% of tested poly- phenols was preserved.
Adsorption; Bentonites; Wine charged model molecules; Kinetics; Wine fining.
Settore CHIM/02 - Chimica Fisica
13-ago-2020
FOOD CHEMISTRY
Article (author)
File in questo prodotto:
File Dimensione Formato  
pagination_FOCH_127840.pdf

embargo fino al 13/08/2021

Tipologia: Post-print, accepted manuscript ecc. (versione accettata dall'editore)
Dimensione 1.33 MB
Formato Adobe PDF
1.33 MB Adobe PDF Visualizza/Apri
1-s2.0-S0308814620317027-main.pdf

non disponibili

Tipologia: Publisher's version/PDF
Dimensione 4.59 MB
Formato Adobe PDF
4.59 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/769483
Citazioni
  • ???jsp.display-item.citation.pmc??? 1
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 2
social impact