6533b82efe1ef96bd12938a0

RESEARCH PRODUCT

Interaction between armenian-clay-based ceramics and model wines

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The use of ceramics for the transformation or conservation of wine has existed since the origins of wine, but the impact of ceramics on wine has not received much attention.However, in contact with the wine, ceramics are generally not neutral materials and the constituent minerals of ceramics are led to dissolve. This work mainly aims to study the migration of elements from ceramics to wine.To our knowledge, this question has so not been addressed so far, at least with our chosen approach.This study required the prior characterization of the materials and the ceramics produced in the laboratory.The analyzes (XRF, XRD, and SEM/EDX) revealed that the natural material used for the manufacture of ceramics contains a large amount of silicon oxide (̴ 60%) and calcium oxide (15-21%). The clay is composed mainly of smectite, kaolinite, mixed-layer clay and illite. After firing, the ceramic is mainly composed of diopside, hematite, gehlenite and minerals from the plagioclase family. The interaction of the ceramic with a model wine has been studied: the natural acidity of the wine favors the dissolution of the ceramic, in response the pH of the wine increases, and the migration of all types of elements present in the ceramic occurs rapidly. The ICP-AES made it possible to follow the migration of 26 elements over 16 months. NMR (Time Domain) is used to guide the approach to questions regarding the impact of headspace volume and oxygen concentration on iron and ethanol redox processes in wine concomitant with the dissolution of the ceramic.The coating of ceramic tablets (for example with beeswax) can greatly reduce and limit the dissolution of the ceramic. Most of the results presented are original and address certain aspects of the interactions between ceramics and wine.