Abstract
Table grapes are fumigated with SO2 to control decay during storage and marketing. The efficacy of the treatment is affected by the type of packaging material used. Most fumigation schedules in commercial use were developed for grapes packed in wooden or wood/kraft veneer (WKV) boxes. In laboratory experiments, grapes packed in expanded polystyrene foam (EPF) boxes sorbed ca 50% less SO2 as did those in WKV boxes; grapes packed in fiberboard boxes sorbed ca 50% more SO2 than did those in WKV boxes. Adjusted fumigation dosages were developed that compensated for sorption by packaging materials and provided comparable concentration x time (CT) products in the fumigation chamber. Free SO2 residues in grapes packed in the three types of boxes and treated with the adjusted dosages were similar (0.11 - 0.13 µg/g); total SO2 residues were 2.3, 1.8, and 1.0 µg/g in grapes packed in WKV, EPF, and fiberboard boxes, respectively. All residues were below a proposed tolerance of 10µg/g. The adjusted schedules had comparable effects on decay control, stem condition, and bleaching of the berries.
- Received November 1986.
- Copyright 1988 by the American Society for Enology and Viticulture
Sign in for ASEV members
ASEV Members, please sign in at ASEV to access the journal online.
Sign in for Institutional and Non-member Subscribers
Log in using your username and password
Pay Per Article - You may access this article (from the computer you are currently using) for 2 day for US$10.00
Regain Access - You can regain access to a recent Pay per Article purchase if your access period has not yet expired.