Q3. a) Briefly discuss the 2 physical methods of preservation.
ANS- Physical methods of food preservation are those that utilize physical treatments to inhibit, destroy, or remove undesirable microorganisms without involving antimicrobial additives or products of microbial metabolism as preservative factors. Microorganisms can be destroyed by established physical microbicide treatments such as heating (including microwave heat treatment), UV or ionizing radiation, and emerging methods of new nonthermal treatments, such as the use of high hydrostatic pressure, pulsed electric fields (PEFs), oscillating magnetic fields, photodynamic effects, and a combination of physical processes such as heat irradiation, dehydroirradiation, and manothermosonication. Mechanical removal of microorganisms from food may be accomplished by membrane filtration of food liquids.
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