MMG 301 Study Guide L37

MMG 301 Study Guide L37 - MMG 301 Final Exam Study Guide...

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MMG 301 Final Exam Study Guide Lecture 37: - Food preservation: o Radiation- ionizing radiation kills microbes; can be used for a wide variety of foods (uncooked meats, produce, prepared meals); irradiation will reduce, but may not eliminate, microbes; controversial because of possible breakdown of nutrients and generation of toxic compounds. o Heat- Pasteurization- short-term heating to reduce microbes in food without significant reduction in quality. Canning- heating in a sealed container, often complete sterility is not achieved ( heat exposure damages food) o Refrigeration- inhibits growth of most microbes; lower temperature = slower growth of microbes; some microbes are psychrotolerant and can grow at refrigerator temps; freezing can prevent growth, but damages certain foods. o Acidity- acidic pH (less than 5) inhibits growth of most pathogens; can also add salt to the food (pickling) o Drying- reducing water content (water activity) inhibits growth; NaCl of >7.5% inhibits most bacteria, but fungi and some gram-positive can grow;
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MMG 301 Study Guide L37 - MMG 301 Final Exam Study Guide...

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