Lecture%2019

Lecture%2019 - Parameters of Microbial Growth and Food...

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Parameters of Microbial Growth and Food Spoilage Atmosphere and Oxidation/Reduction Potential Part 1 What is the role of atmosphere in microbial growth? What is an oxidation-reduction reaction? What are electron carriers? Why is oxygen an important molecule for respiration? What are the drawbacks of respiration? How is this knowledge applied to food preservation?
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H 2 Electron-donating half reaction 2e - + 2H + O + 2e - Electron-accepting half reaction O 2- Oxidation-Reduction Reactions O 2- 2H + + H 2 O Formation of water
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Electron Carriers of Cells NAD+ accepts one electron from a hydrogen It also binds to a second hydrogen. H + NAD Reduced H + Oxidized NAD + H H NAD + is a co-factor for several enzymes of the cell Electron acceptor Electron donor Oxidized Reduced
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Electron Carriers are Important for Metabolism Example 1: Glycolysis and Glyceraldehyde-3-Phosphate Dehydrogenase NAD + accepts electrons when metabolites are oxidized for energy H + NAD Reduced NAD + Oxidized
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Electron Carriers are Important for Metabolism
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Lecture%2019 - Parameters of Microbial Growth and Food...

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