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Inactivation-rate studies on a radiation-resistant spoilage microorganism. III. Thermal inactivation rates in beef

Journal Article · · Journal of Food Science (U.S.)
; ;
Micrococcus radiodurans, a nonsporing spoilage bacterium highly resistant to ionizing radiation and to ultraviolet light, can be isolated from spoiled meats that had been irradiated to 2 or 3 megarep. The extreme resistance to radiation of this microorganism makes commercial sterility by irradiation difficult to obtain without adverse effects on flavor. Survival curves for cultures of this organism exhibiting the highest radiation resistance were determined at several temperatures in a beef substrate, and a thermal resistance curve was constructed. A modified thermal-death-time tube was used, with cells uniformly suspended in a raw meat puree reconstituted from freeze-dried and powdered beef that had been screened to remove pipette-plugging fibers and irradiated to eliminate viable organisms before use. Thermal death rate, unlike the radiation death rate, approximated an exponential form, as indicated by survival curves. Heat treatment reduced the resistance of this organism to subsequent irradiation, and it was also shown that irradiation at higher temperatures (40 and 50°C) is more effective in inactivating this organism than irradiation at temperatures below 40°C. It may be of some advantage, then, to use radiation and heat treatment concomitantly in attempting to limit spoilage due to this organism.
Research Organization:
Univ. of Kansas School of Medicine, Kansas City
Sponsoring Organization:
USDOE
NSA Number:
NSA-17-036096
OSTI ID:
4636228
Journal Information:
Journal of Food Science (U.S.), Journal Name: Journal of Food Science (U.S.) Vol. Vol: 28; ISSN JFDSA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BACTERIA
EFFICIENCY
GAMMA RADIATION
IRRADIATION
MEAT
MICROCOCCUS RADIODURANS
MICROORGANISMS
ODOR
STABILITY
TEMPERATURE
ULTRAVIOLET RADIATION
X RADIATION