Inhibiting effect of tannin in chokeberry must on the winemaking process
2006
Pogorzelski, E., E-mail: [email protected] | Wilkowska, A. | Kobus, M. (Lodz Technical University (Poland). Inst. of Fermentation Technology and Microbiology)
The method of high performance gel permeation chromatography (HPGPC) was used to determine molecular weights of polyphenols present in chokeberry wines. Three polyphenol fractions of the molecular weights 200, 600 and 994 Da were determined. In order to precipitate polyphenols, polyvinyl polypyrrolidone (0.2 and 0.8 g/L) and gelatin (0.2 and 0.4 g/L) were added to wines. The fermentation process of chokeberry must revealed faster completion in wines with the addition of gelatin and PVPP in contrary to wine with no additives. PVPP was shown to be more selective than gelatin in precipitating polyphenols of higher molecular weights above 600 Da, which strongly inhibit the fermentation process. In order to improve fermentation conditions, the addition of 0.8 g/L PVPP is recommended
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