Abstract
In a previous work, we produced highly specific, polyclonal antibodies against the total proteins or individual polypeptides of a Portuguese wine prepared from the single grape variety Assario. Using immunological methods, immunoblotting in particular, we have applied these antibodies to analyze the origin of the wine proteins and to detect the presence of identical or similar proteins in distinct wines or in wines prepared from different grape varieties. The results obtained indicate that the different Assario wine proteins show some degree of structural similarity. Furthermore, when the total protein composition of grape skin, pulp, seed, stem, leaf and yeast was analyzed, the Assario proteins were found to originate entirely from the pulp. However, important changes were noted to occur in the pulp proteins during vinification. On the other hand, grapes from different, white or red varieties, were found to contain a set of polypeptides identical to those present in the Assario grapes. In addition, wines appear to contain a structurally identical or very similar set of polypeptides, regardless of the variety, year or region of the grapes utilized in their production.
- Received December 1998.
- Revision received October 1999.
- Copyright 2000 by the American Society for Enology and Viticulture
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