TY - JOUR T1 - Response of a Hard-to-Press <em>Vitis rotundifolia</em> Cultivar and a Hard-to-Clarify <em>Euvitis</em> Hybrid to Commercial Enzyme Preparations JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 341 LP - 343 DO - 10.5344/ajev.1988.39.4.341 VL - 39 IS - 4 AU - C. A. Sims AU - R. P. Johnson AU - R. P. Bates Y1 - 1988/01/01 UR - http://www.ajevonline.org/content/39/4/341.abstract N2 - 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. ER -