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Micro of Eggs2

Micro of Eggs2 - Microbiology of Eggs Microflora of Eggs...

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Microbiology of Eggs Harrison FDST 4030/6030 1 Harrison FDST 8090 Microbiology of Eggs Harrison FDST 8090 Microflora of Eggs Primary sources Intestinal tract of bird, nest, dust, feed, shipping and storage containers, humans, etc. Numbers on shells varies - 10 2 -10 7 /shell Depends on source and handling Normally more Gr + than Gr - on shell Micrococci, Pseudomonas, Moraxella, etc . Harrison FDST 8090 Shell Eggs Contents are highly perishable Intact, dry shelled eggs may have shelf life of months (even at room temperature) Most in commerce contain no bacteria within the shell Harrison FDST 8090 Eggs: Factors Affecting Microbial Growth Shell Mechanical barrier Albumen components Lysozyme - lysis cell walls of Gr + Conalbumin - chelates iron, copper pH - increases from 7.7 to ~9.4 CO 2 that is present is lost; pH increases Conalbumin activity is greater at higher pH Others - 8-10 other factors Harrison FDST 8090 Harrison FDST 8090 Egg Processing
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