PT - JOURNAL ARTICLE AU - K. E. Nelson AU - M. Ahmedullah TI - Effect of Type of In-Package Sulfur Dioxide Generator and Packaging Materials on Quality of Stored Table Grapes AID - 10.5344/ajev.1972.23.2.78 DP - 1972 Jan 01 TA - American Journal of Enology and Viticulture PG - 78--85 VI - 23 IP - 2 4099 - http://www.ajevonline.org/content/23/2/78.short 4100 - http://www.ajevonline.org/content/23/2/78.full SO - Am J Enol Vitic.1972 Jan 01; 23 AB - Storage tests were held to determine the effect of the kind and thickness of the plastic film of inpackage SO2 generators on the release rate of SO2 and amounts of SO2 and water vapor retained within unvented containers of table grapes. An emulsion of NaHSO3 with plastic polymers extruded as a thin layer on kraft paper was as effective for a firststage generator as was a two-ply tea-bag stock generator with pouches containing NaHSO3 powder, and is cheaper to manufacture. As a first-stage generator, however, neither extruded strips of the emulsion on kraft paper nor perforated polyethylene film pouches containing NaHSO3 powder generated SO2 soon enough. Further, emulsion strips heat-sealed between polyethylene-coated paper sheets generated SO2 only long enough to be satisfactory for a month as second-stage generators. The thickness of polyethylene film around the pouches of NaHSO3 was more significant in rate of release of SO2 than was the dose of NaHSO3 up to 10 weeks of storage. Thereafter dose of the NaHSO3 was marked in effect. Cellulose acetate showed considerable promise as a film regulating release of SO2 for storage periods of three months. Polyethylene-coated curtains in wood lugs were more effective than kraft curtains in retaining SO2 and water vapor in the unvented container.