1. Food preservation by modified atmosphere (Modified Atmosphere or MA-Storage)
- associated with electron transfer of food. Effect on the growth of microorganisms
- trying to get rid of the oxygen in the food preservation by
.- control vacuum conditions, use vacuum packaging
- add another gas such as CO2 N2 called storage controlled atmosphere (Controlled. Atmosphere)
control techniques, atmosphere (Controlled Atmosphere Packaging;CAP) is the treatment of the circumstances of food to stable during storage. Often used to transport food
- advantages: extend the shelf life 50 - 100%, reduce loss,. Transport further, maintain product quality CO2
.A colorless, no smell, no help for fire
CO2 not cause toxic residues in food
in solid form (dry ice). (- 78.5 ° C) volatile simply makes burns has
.The mixed gas in adjusting the atmosphere (MA) or control the atmosphere (CA) of food
effect of CO2 microorganism
- inhibition of microorganisms. Especially Gram-negative bacteria and fungi
.Education under low T concentration of CO2 increased pH increasing effective in inhibiting / destroy microbial
- CO2 compete with ethylene. The ripe fruit is slow. The fungus could grow
mechanism to destroy microorganisms
.Stretch lag phase phase, reduce the cleavage rate
. Inhibit transmission substances into cells membrane
inhibit the synthesis of enz and reduces the reaction function of the enz.
chemical properties change - Physics of membrane
. Reduce the pH in cells N2
.
Inert gas, not affecting the destruction of microorganisms directly
effects indirectly - to reduce the O2 conditions or no O2 (N2 100%) inhibit the growth of aerobic. Mo. And fungi
oxidation reduce lipid Ozone found in nature, the earth's atmosphere, or from the industry, chemical, chemical, nuclear
.Destroy microorganisms surface food used in drinking water production of mineral water
destroy enzyme, cell รบกวนระบบหายใจ
sterilization bottle water. Juice, soda
2. Temperature in food preservation
.- the microorganisms by temperature effects on growth, as follows:
1. Psychophiles: growing in the T < 7 ˚ C
2. Psychotrophs. : grow the T low and moderate
3. Mesophiles: growing in the T 20-45 ˚ C
4. Thermophiles: growing in the T 55-65 ˚ C.
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