Abstract
A hard-to-press white grape cultivar, Dixie (Vitis rotundifolia), and a hard-to-clarify white cultivar, Stover (Euvitis hybrid), were treated with three concentrations of a commercial pectinase preparation and a pectinase-cellulase-hemicellulase preparation in an effort to improve press yields and/or the degree of settling. Both the standard pectinase preparation and the pectinase-cellulase-hemicellulase preparation were effective in increasing total press yields and free-run juice from both cultivars. However, the pectinase-cellulase-hemicellulase mixture did not increase settleable solids or total suspended solids in the Euvitis hybrid to nearly the extent of the pectinase preparation. The pectinase-cellulase-hemicellulase preparation was slightly more effective in increasing free-run yields than was the standard pectinase preparation.
- Received March 1988.
- Copyright 1988 by the American Society for Enology and Viticulture
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