1. Food preservation by modified atmosphere (Modified Atmosphere, or MA-Storage)
• involves the transfer of electrons. Affect the growth of microorganisms
•. Try to eliminate oxygen in food preservation by
- controlled vacuum use Vacuum packaging
- gas instead as CO2 N2 called retention controlled atmosphere (Controlled Atmosphere)
techniques to control the atmosphere (Controlled Atmosphere Packaging; CAP) as a treatment for the condition. environment of stable during storage. Often used to transport food
• Advantages: extended shelf 50-100%, reduce waste, transport farther, maintaining product quality CO2 is colorless, odorless, non-flammable allows CO2. Does not cause toxic residues in the food industry in solid form (dry ice) (-78.5 ° C) was charred skin evaporates easily used in mixed gas in the modified atmosphere (MA) or a control (. CA) of the effects of CO2 per microorganisms •. Microorganisms Especially Gram-negative bacteria and fungi in the presence of T • Low concentrations of CO2 increase pH decreased more effective in inhibiting / phage • CO2 competes with ethylene gas. Make fruit ripen slowly The fungus can not grow phage mechanisms to extend the lag phase, reducing the rate of proliferation , inhibit the transmission of substances into the cell membrane synthesis inhibitor enz. and reduce reactive process works. enz. Changes treasure Chemistry - Physics of the membrane, reducing the pH in the cell N2 inert gas. Directly affecting the disinfecting effect indirectly - the condition without O2 or O2 (N2 100%) inhibition of aerobic mo. and fungi reduce lipid oxidation Ozone found in nature. Earth's atmosphere or from chemical, nuclear Chemical phage surface food. Used in the production of drinking water. Minerals, enzymes break Interfere with cell respiration sterilize bottles of water, juice, soft drinks 2. The temperature in food storage - microbial communities. BY optimum temperature for growth as follows: 1. Psychophiles: growth in a T <7 ˚C 2. Psychotrophs: T grew both low and moderate 3. Mesophiles: growing in a 20-45 ˚C T 4. Thermophiles: growth in a T 55-65 ˚C.
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