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Clarification of apple juice using activated sepiolite as a new fining clay

Authors
  • Mirzaaghaei, Marzieh
  • Goli, Sayed Amir Hossein
  • Fathi, Milad
Type
Published Article
Journal
Clay Minerals
Publisher
The Mineralogical Society
Publication Date
Dec 20, 2017
Volume
52
Issue
4
Pages
497–508
Identifiers
DOI: 10.1180/claymin.2017.052.4.07
Source
De Gruyter
Keywords
License
Yellow

Abstract

The function of acid-activated sepiolite clay was evaluated for use in the clarification of apple juice. Optimizing the clarification process was done using response surface methodology (RSM) considering juice turbidity as a response. The efficiency of sepiolite in terms of clarification was compared to that of bentonite and a combination of these fining agents with gelatin and silica gel at optimal conditions. The conditions of 0.05% clay concentration at a temperature of 50°C for 7 h were deemed optimal in terms of juice clarification. The present results showed that treatment of sepiolitegelatin- silica gel was the most active fining agent with 99.7% reduction in apple-juice turbidity. The rate of turbidity, the viscosity, the total phenolic contents and the colour changes were fitted to first-, zero-, first- and zero-order kinetic models, respectively.

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