%0 Journal Article %A C. A. Sims %A R. P. Johnson %A R. P. Bates %T Response of a Hard-to-Press Vitis rotundifolia Cultivar and a Hard-to-Clarify Euvitis Hybrid to Commercial Enzyme Preparations %D 1988 %R 10.5344/ajev.1988.39.4.341 %J American Journal of Enology and Viticulture %P 341-343 %V 39 %N 4 %X 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. %U https://www.ajevonline.org/content/ajev/39/4/341.full.pdf