By Swalm C.M. (ed.)
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Extra info for Chemistry of food Packaging
As is apparently required of most higher molecular weight oxygen scavengers, a transition metal catalyst such as iron, cobalt, or nickel, with cobalt preferred, is required in the form of 2-ethylhexanoate or neodecanate. , all the common packaging thermoplastics. Films may be fabricated by most of the common plastics-fabrication procedures such as coextrusion, solvent casting, and/or extrusion coating, and more rigid containers by injection molding and/or stretch blow-molding. Scavenger compounds are incorporated in the range of less than 5% of the total weight of the package material.
SULFITES Sulfites and their analogues have been employed as oxygen scavengers for many decades. S. 2,825,651) (Loo and Jackson, 1958) described the use of sulfite salt with copper sulfate as a catalyst for oxygen scavenging. The sodium sulfite and its adjunct palletized powders were placed in a separate sachet. 5 cc of oxygen in 5 hours. If spread into a film, the particles could react without the presence of water because of their intimate contact with the food. In addition, since they could be ground to a fairly fine particle size, they should be able to be incorporated into a film.
Food Science Australia, formerly the Commonwealth Scientific and Industrial Research Organization (CSIRO), has been in the forefront of oxygenscavenging package materials for several years. Information from this organization has been discussed above; more is provided later in this chapter. A 1993 patent assigned to W. R. Grace and Company discussed the use of isoascorbates plus sulfites as oxygen scavengers in the plastic gasket liners of bottle closures. The concept in this patent was to remove oxygen from the headspace of glass or even plastic bottles and to significantly reduce or even eliminate the quantity of oxygen otherwise permeating through the liner compound.