Concentration of must by reverse osmosis
II.2.1.12.1 Concentration
Definition :
Process consisting of concentrating must by elimination of part of the water through specific membranes under the action of a pressure greater than the osmotic pressure of the must.
Objective :
To obtain an enrichment of the must, especially in sugars.
Partial dehydratation of musts
II.2.1.12 Partial dehydratation of musts
Definition:
Process consisting in the elimination of a certain quantity of water in grape must.
Objectives:
a) To increase the sugar level of a must intended to be fermented;
Filtration on a filter bed
II.2.1.11.1 Filtration on a filter bed
Classification:
- Diatomite: processing aid
- Perlite : processing aid
Definition :
Filtration of the must through a bed of auxiliary filter material.
Objective :
Filtration
II.2.1.11 Filtration
Definition :
Physical process by which must is passed through appropriate filters that retain particles in suspension.
Objective :
Clarification of the must.
Prescriptions :
a) Filtration is practised with or without additives.
Treatment with silicon dioxide
II.2.1.10 Treatment with silicon dioxide
Classification
- Colloidal solution of silicon dioxide: Processing aid
Definition :
Addition to must of a colloidal solution of silicon dioxide coupled with the addition of a gelatin solution.
Objective :
Treatment with carbon
II.2.1.9 Treatment with carbon
Classification:
- Oenological carbon: processing aid
Definition :
Addition of carbon to musts.
Objectives :
Treatment with bentonites
II.2.1.8 Treatment with bentonites
Classification:
- Bentonites : processing aid
Definition :
Addition of bentonites to must.
Objective :
Preventive treatment for protein and copper hazes.
Prescription :
Tannin addition
II.2.1.7 Tanin addition
Definition :
Addition of tannin to must.
Objectives :
a) To facilitate the subsequent stabilisation of wines by partial precipitation of excess proteinaceous matter in musts;
Gelatin treatment
II.2.1.6 Gelatin treatment
Classification
- Gelatin: processing aid
Definition:
Addition of gelatin to the must
Objectives:
Settling
II.2.1.5 Settling
Definition :
Separation, before fermentation, of the more or less clear liquid from the solid matter suspended in the must.
Objectives :
a) To eliminate soil particles.