II.3.2.8 Use of enzymes for improving filterability of wines

Classification :

II.3.2.6 Tannin addition

Definition:

Addition of tannins to wine.

Objectives:

a)        To facilitate the stabilisation of wines by partial precipitation of excess proteinaceous matter;

II.3.2.5 Decanting

Definition :

Operation consisting of transferring from one wine tank to another:

A still wine at normal pressure,

Objectives :

a)        To separate wines from their lees, deposited on the bottom of the container.

II.3.2.4 Treatment with silicon dioxide

Classification:

• Colloidal silicon dioxide solution: processing aid

Definition :

Addition to wine of a colloidal solution (gel) of silicon dioxide coupled with the addition of a gelatin solution or, possibly, with other proteinaceous finings.

Objective :

II.3.2.3 Racking

Classification:

• Nitrogen: processing aid
• Argon: processing aid

Definition :

Operation involving the transfer of wine from one wine container to another by allowing the separation of solid deposits from the liquid.

Objectives:

II.3.2.2.2 Sterilising filtration

Definition:

Filtration of wines on materials allowing the elimination of microorganisms.

Objective :

To obtain biologically stable wines for bottling.

Prescriptions :

II.3.2.2.1 Filtration by continuous deposition

Definition :

Filtration of the wine, after formation of a filter bed, which is then fed constantly by a continuous addition of filter material into the wine to be clarified.

Objective :

To obtain a suitable level of clarity, to a given technological stage, by the elimination of substances in suspension in the wine.

II.3.2.2 Filtration

Classification:

• Diatomite: processing aid
• Perlite: processing aid

Definition:

Physical process consisting of passing the wine through appropriate filters that retain particles in suspension.

Objectives:

II.3.2 Clarification of wine