Action povyshenoj concentration of hydrogen ions

Kvashenie it is based on biochemical processes at which the dairy acid possessing preserving action is formed of carbohydrates and some other substances. For long storage received by this method of conservation of products it is necessary, that the maintenance of dairy acid made not less than 0,7%. Therefore in a product preliminary add chloride of sodium which in the beginning kvashenija interferes with reproduction of microorganisms, and then the sugar forming dairy acid. This method preserve vegetables, fruit, mushrooms.

Pickling is carried out by means of acetic acid in number of 1,2-1,8% and salt (8-10%). The principle of action of pickling consists in creation of the raised concentration of ions of hydrogen (change rn in the sour party), cytoplasm of cages of microorganisms changing dispersion. Thereof growth and reproduction of the putrefactive and pathogenic microorganisms actively breeding in the neutral environment (rn=7-8) stops.

To conservation of products by pickling it can be applied not only acetic, but also lemon, dairy and other acids. Pickle more often vegetables, fruit and mushrooms.

Atermichesky, or cold, sterilisation is reached by action of radiant energy radionuklidov or accelerated - nyh elektronov, possessing the big energy. Thus ^: there is an ionisation of contents of cages of microorganisms owing to what they cease to breed. At conservation by this method (milk, juice) remain vitamins, but change organolepticheskie properties of products - there is an unpleasant smell, colour changes, taste is lost.

Action of antibiotics. It is authorised to apply the limited quantity of antibiotics as they can change normal microflora of guts to conservation of foodstuff, raise ability of an organism to react to influence of external factors etc. biomitsin add in ice (5 g on 1 t ice) at storage of fish. Thus its residual quantity in a crude product should be no more than 0,25 mg/kg. biomitsin together with nystatin it is supposed to apply to storage of meat (hulks) at distant transportations in cars-refrigerators. Hulks thus are irrigated with a solution biomitsina (100 mg/l) and nystatin (200 mg/l).

Action of antiseptic tanks. It is authorised to apply the antiseptics which is not possessing cumulative action, not forming toxic connections which are not destroying vitamins and not reducing activity of enzymes of the food channel to conservation. So, sulphurous acid is applied to conservation of vegetative products of vegetables, fruit, berries. Destroying in products oxidising enzymes, this acid promotes preservation of ascorbic acid, tiamina, reproduction of an intestinal stick and other microorganisms brakes.

Sorbinovaja acid oppresses growth of microorganisms, plesnevyh mushrooms. In a human body it breaks up to carbonic acid and water, allocating thus certain quantity of energy. It is applied to conservation of plodovo-berry juice, soft drinks, processing of a surface of cheeses, bakery and confectionery products.

Boric acid is less favorable for conservation as possesses weak bactericidal action and is applied to the limited number of products: ketovoj caviar, melange. Benzojnaja acid is applied in connection with other substances in a kind abakterina and a microbin.