MICR-4070 Lecture Notes - Lecture 17: Germination, Electroporation, Organic Food
22 Mar 2018
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Micr 4070: food and dairy microbiology: test 2 (lecture 8, food irradiation, high hydrostatic. Lethal for microorganisms: no other preservatives need to be added since it will kill the desired of number of m/o. No detectable change in product taste or texture at <5 kgy. No/little heat generated: per 50 kgy, there is only a 12 c increase. Penetration of gamma rays is instant, deep, and uniform. Enzymes and toxins are not inactivated: enzymes can be eliminated through pasteurization. Chemical changes may produce unacceptable organoleptic (small, taste, etc. ) changes at >10 kgy levels: proteins -> co2h2, amides, ammonia, and carbonyls, lipids -> caronals, h2o2. Dose levels to kill m/o much higher than to kill man (0. 5-1 krad: in poultry, they use 4. 5 kgy. Monday, march 5, 2018: in a human (x-ray, etc), they use 1/2 mcgy, this difference is 9. 6 x 10^6 more. Potential induction of factors in that causing adverse effects in humans.
