The vacuum is literally a state of rarefaction of the air at a pressure lower than atmospheric pres

The vacuum is literally a state of rarefaction of the air at a pressure lower than atmospheric pressure e436 (of course the absolute vacuum is unattainable but the best packers can achieve a level of vacuum of 99.9%). The rarefaction of the air or its replacement with inert gases (gas mixtures food) has as a consequence e436 the fundamental reduction of the presence of oxygen, known as a gas is vital not only to humans but also to microorganisms such as bacteria and mold . The significant reduction of oxygen can then block the microrganisimi-proliferation of such activities and their fermentation also prevents alterations of the product to keep. The optimum condition of rarefaction of the air is created in a microenvironment, such as an envelope, a container, a pan thanks to a specific machine equipped with a pump for the extraction of air and sealing device, which allows to maintain e436 the lack of oxygen stable within the microenvironment. The cycle of food preservation involves several stages: 1. Preparation of foods to be preserved 2. Packaging (vacuum or in a protective e436 atmosphere) 3. Labelling 4. Refrigeration pasteurization / cooking according to the type of food 5. Abatement of temperature (in the case cooking) 6. Refrigeration 7. Restoring e436 the temperature according to the type of food to proceed to its use. Hygiene is an essential factor in the cycle of preparation e436 and storage of food, as well as the first objective of the applications of vacuum and modified. Failure to observe the rules of hygiene is not only due to a poor organoleptic quality of the products, but also the risk of food poisoning from the most trivial to the most serious. The presence of microbes nel'ambiente is a very important aspect e436 to keep in mind there are several situazioninelle which they proliferate (average temperatures, humidity, presence of oxygen) e436 and it is for this reason that the process of vacuum is a great tool for the presence inbirne and greatly e436 improve the preservation of food. In this context it is worth remembering always that the vacuum is not a means to recover or improve e436 food leftovers of already poor quality.
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