Code International des pratiques œnologiques

Download document

Promoting secondary fermentation by the use of nutritive salts and of yeast growth factors

II.4.1.7 Promoting secondary fermentation by the use of nutritive salts and of yeasts growth factors

 

Classification:

  • Ammonium sulphate: processing aid
  • Diammonium hydrogen phosphate: processing aid
  • Thiamine hydrochloride: processing aid

Definition :

Addition of ammonium salts and of thiamin to base wines destined for secondary fermentation.

Objective :

To facilitate the multiplication of yeasts during secondary fermentation in a bottle or in a closed tank still containing grape sugars or with the addition of a tirage liqueur.

Prescriptions :

Nutrititive salts and other growth factors added shall be:

a)        For nutritive salts, diammonium phosphate, or ammonium sulphate to a maximum dose of 0.3 g/l (expressed as the salt).

b)       For growth factors, thiamin in the form of thiamin hydrochlorid to a maximum dose of 0.6 mg/l. (expressed as thiamin).

c)        These substances shall comply with the prescriptions of the International Oenological Codex .

Recommendation of OIV:

Admitted