Advances in Food Dehydration by Cristina Ratti download in iPad, ePub, pdf
Spoilage mechanisms Food spoilage may be defined as any change that renders food unfit for human consumption. The advantages of reduced bulk later came to be appreciated by campers and backpackers and also by relief agencies that provide food in times of emergency and disaster. Freeze-drying benefits heat-sensitive products by dehydrating in the frozen state without intermediate thaw.
Drying under vacuum is especially beneficial to fruits and vegetables. Freeze-drying of meat yields a product of excellent stability, which on rehydration closely resembles fresh meat. When bacteria contaminate a food substrate, it takes some time before they start growing. Advanced monitoring and control systems are developed to facilitate automation and flexible food manufacturing.
This growth is the result of the division of one bacterial cell into two identical bacterial cells, a process called binary fission. Diuresis can be accomplished either at home with subcutaneous fluids or in the clinic with intravenous or subcutaneous fluids. When conditions become favourable for growth e.
These enzymes begin to break down the cellular material. Foods may be contaminated by microorganisms at any time during harvest, storage, processing, distribution, handling, or preparation. Garlic and onion are often dried.
In addition to oxygen concentration, the oxygen reduction potential of the growth medium influences bacterial growth. The oxygen reduction potential is a relative measure of the oxidizing or reducing capacity of the growth medium. During the stationary phase, the rate of bacterial cell growth is equal to the rate of bacterial cell death.
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