lecture 12

lecture 12 - FDT 4010-Lecture 12 Processing using electric...

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FDT 4010-Lecture 12 Processing using electric fields, high hydrostatic pressure, light or ultrasound 1. How does A w affect microbial resistance to pulsed electrical fields? Only suitable for liquids or particles in liquids; i.e. pasteurization of fruit juices, soups, liquid eggs, and milks Foods should have ~40% free water for anti-microbial effect i. Table 9.2 A decrease in A w represses the killing effect of the PEF Intensity of the field, ionic strength, pH, electrical activity, cell membranes, 2. How does high pressure affect enzyme activity in foods? Little effect on food enzyme activity i. Table 9.2 Enzymes that are related to food quality vary in their barosensitivity (sensitivity to high pressures); Some can be inactivated at room temperature by pressures of a few hundred MPa; others can withstand 1000 MPa; others have t heir activity enhanced by high pressures. i.
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lecture 12 - FDT 4010-Lecture 12 Processing using electric...

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