The storage life at 43°F of ground dover sole fillets (Microstomas pacificus) was determined microbiologically after treatment with
ionizing radiation and antimicrobial agents. Sodium benzoate, potassium
sorbate and the sodium salts of the methyl and propyl esters
of parahydroxybenzoic acid (MPB and PPB) all approximately doubled
the refrigerated storage life of irradiated dover sole. The dose levels
employed were 0.1, 0.3, and 0.5 Mrad. The concentration of the
agents used in each case was 0.1 percent.
The normal spoilage of dover sole is caused predominately by
the outgrowth of pseudomonads. After irradiation, however, the spoilage
is due to the outgrowth of Achromobacter and certain Gram positive
organisms. The spoilage pattern was not changed by the antimicrobial
agents tested except at the higher dose level (0.5 Mrad),
at which the spoilage was caused by yeasts.
The additives had no effect on the growth rate of the microorganisms
of dover sole. They merely prolonged the length of microbial
dormancy that followed radiation exposure. Possible mechanisms
involved in the combined effect of antimicrobial agents and irradiation
are discussed. / Graduation date: 1965
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/27006 |
| Date | 19 April 1965 |
| Creators | Shiflett, Maureen Adele |
| Contributors | Lee, Jong S. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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