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The combined use of steam-treated bentonites and natural zeolites in the oenological refining process

Published online by Cambridge University Press:  02 January 2018

M. Mercurio*
Affiliation:
Dipartimento di Scienze e Tecnologie, Università degli Studi del Sannio, Via dei Mulini 59/A, 82100 Benevento, Italy
D. L. Bish
Affiliation:
Department of Geological Sciences, Indiana University, Bloomington, IN 47405, USA
P. Cappelletti
Affiliation:
Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse (DiSTAR), Università di Napoli Federico II, Via Mezzocannone 8, 80134 Naples, Italy
B. de Gennaro
Affiliation:
Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale (DICMAPI), Università di Napoli, Federico II, P.le Tecchio 80, 80125 Naples, Italy
M. de Gennaro
Affiliation:
INNOVA SCaRL, Via Campi Flegrei 34, 80078, Pozzuoli (Naples), Italy
C. Grifa
Affiliation:
Dipartimento di Scienze e Tecnologie, Università degli Studi del Sannio, Via dei Mulini 59/A, 82100 Benevento, Italy
F. Izzo
Affiliation:
Dipartimento di Scienze e Tecnologie, Università degli Studi del Sannio, Via dei Mulini 59/A, 82100 Benevento, Italy
V. Mercurio
Affiliation:
Winemaker, Salita Santa Croce 27, 80053 Castellammare di Stabia (Naples), Italy
V. Morra
Affiliation:
Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse (DiSTAR), Università di Napoli Federico II, Via Mezzocannone 8, 80134 Naples, Italy
A. Langella
Affiliation:
Dipartimento di Scienze e Tecnologie, Università degli Studi del Sannio, Via dei Mulini 59/A, 82100 Benevento, Italy
*

Abstract

Industrial minerals, particularly bentonites, have long been used in treatments to improve the stability and shelf life of white wines. We evaluated a new combination of rocks and minerals, including steam-treated bentonites and natural zeolites (chabazite and phillipsite), to greatly reduce the risk of protein and tartaric instability of wines. Detailed mineralogical, chemical and electrokinetic studies of these materials were conducted using powder X-ray diffraction (PXRD), X-ray fluorescence (XRF), microporosimetry, BET surface-area analysis and zeta-potential measurements. Several model wine solutions containing Bovine Serum Albumin (BSA) were prepared to evaluate the oenological performance of the rock/mineral combinations. UV-VIS spectrophotometry and ion chromatography were used to evaluate the degree of wine stabilization from the protein and tartaric point of view.

The experimental results showed that steam treatment modifies both the microporosity and external surface area of the bentonite. These changes in surface area, along with creation of hydrophobic surfaces, significantly modified the behaviour of the steam-treated bentonites, requiring an increase in the amount of material necessary to bring the protein content to required levels. An important benefit derived from the use of steam-treated bentonites is that the pre-mixing with water before addition to wine is not necessary, as the material is readily dispersed. Finally, the addition of natural zeolites effectively decreased the potassium content, thereby improving the tartaric stability of white wines. In addition, this procedure results in minimal waste, as the bentonite-zeolite mixture can be reused as soil amendments in agriculture.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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