Flash release (FR) is a technique used in
wine pressing
In winemaking, pressing is the process where juice is extracted from the grapes with the aid of a wine-press, by hand, or even by the weight of the grape berries and clusters.Jeff Cox ''From Vines to Wines: The Complete Guide to Growing Grapes an ...
. The technique allows for a better extraction of
phenolic compounds and
wine polysaccharide
Sugars in wine are at the heart of what makes winemaking possible. During the process of fermentation, sugars from wine grapes are broken down and converted by yeast into alcohol (ethanol) and carbon dioxide. Grapes accumulate sugars as they gro ...
s.
The treatment consists of heating the grapes at 95 °C (203 °F) for several minutes with vapour and then submitting them to a strong
vacuum
A vacuum is a space devoid of matter. The word is derived from the Latin adjective ''vacuus'' for "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure. Physicists often dis ...
.
The technique can be applied to other type of juice extraction.
[Application of flash-release, a new extraction procedure (juice, pulp, essential oil); Brat P, 2001, Fruitrop (85), pages 11-13, Journée professionnelle Technofruits 2001, 2001-09-05, Montpellier, France.]
References
Winemaking
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