Yeast assimilable nitrogen, or YAN, as it is more commonly referred to, comprises ammonia and alpha amino acids and is,
apart from sugar, by far the most important nutritional requirement in wine fermentations.
To determine the YAN value of a juice, the FAN or the free alpha-amino groups of the primary amino acids is measured.
This value is then added to the ammonia concentration value.
Proline, a very dominant amino acid in grape juices, is excluded from YAN measurements because yeast cannot utilise it
under the anaerobic conditions of fermentation.
Yeast assimilable nitrogen, or YAN, as it is more commonly referred to, comprises ammonia and alpha amino acids and is,apart from sugar, by far the most important nutritional requirement in wine fermentations. To determine the YAN value of a juice, the FAN or the free alpha-amino groups of the primary amino acids is measured. This value is then added to the ammonia concentration value. Proline, a very dominant amino acid in grape juices, is excluded from YAN measurements because yeast cannot utilise itunder the anaerobic conditions of fermentation.
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