Kommission Önologie

Adopted

Gas control by GC

COEI-2-CONGAZ Analyses of gas control by gaseous chromatography

  1. Principle

The gases are controlled by chromatography in gaseous phase using a "molecular sieve" type column and detection by catharometer or flame ionisation.

  1. Sampling

Either use

Zeolite Y-faujasite

COEI-1-ZEOLIT Zeolite Y-Faujasite

  1. Object, origin and field of application

Zeolite Y-Faujasite is synthesized from alumina sources such as sodium aluminate and silica sources such as sodium silicate.

Zeolite Y-Faujasite incorporated in depth filtration filter sheets play an important role in simultaneously clarifying and selectively removing taint molecules which alter wine flavours

Grape sugar

COEI-1-SUCRAI Grape sugar (rectified concentrated grape musts)

  1. Objective, origin and scope of application

Grape sugar is obtained exclusively from grape musts.  The addition of grape sugar to wine is subject to regulation.

The label, or, when this is absent, the documentation accompanying the containers of grape sugar, must cite the sugar percentage.

Cation exchange resins

COEI-1-RESECA Cation exchange resins

  1. Objective, origin and scope of application

Ion exchange is the reversible exchange of ions between a liquid and a solid, during the course of which the solid does not undergo any substantial changes.  When this technique is applied to wine, the solid is an insoluble, permeable synthetic resin capable of exchanging ions with the wine with which it is in contact.

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