Lecture+21+Microbial+Food+Spoilage+_color_

Lecture+21+Microbial+Food+Spoilage+_color_ - Microbial...

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Microbial Food Spoilage Patterns Microbial Food Spoilage Patterns Qingwen(Fairy) Fan FST 104 March 2 Microbial Food Spoilage Patterns Microbial Food Spoilage Patterns What is food spoilage? Food Spoilage Food Spoilage Spoilage Microbes Microbes Spoilage Evaluation Spoilage Evaluation What microbes may cause spoilage in food? How to evaluate food spoilage?
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Food Spoilage Food Spoilage Food Spoilage Food Spoilage Generally, there are 3 causes of food spoilage: Microbial spoilage Autolysis Other factors Enzymes can cause undesirable changes in color, texture and flavor of uncooked foods. (meat) E.g. Low temperature injury(refrigerated cucumbers)
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Food spoilage evaluation Food spoilage evaluation Identifying Food Characteristics Identifying Food Characteristics Microbes Likely to be Present Microbes Capable of Growing Microbes Capable of Growing The Fastest Growing Group(FGG) The Fastest Growing Group(FGG) Effects Caused by the FGG Effects Caused by the FGG Identifying food characteristics Identifying food characteristics Water Activity Storage Temp Others Chemical Constituents pH value? Reducing or oxidizing environment? Is the food kept in fridge? Food texture etc. Acidity Redox potential Available Energy sources Large molecular weight barriers Specific inhibitors
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Normal flora of plants or animal Microbes likely to be present Microbes likely to be present
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Lecture+21+Microbial+Food+Spoilage+_color_ - Microbial...

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