Sodium benzoate, potassium sorbate, sodium dehydroacetate, calcium propionate, sodium diacetate, sodium lactate, Propyl Paraben, Lactococcus lactis element, such as hydrogen peroxide.

Preservative is used to maintain the original quality and nutritional value of food for the purpose of food additives, it can inhibit the growth and reproduction of microorganisms to prevent food spoilage and prolong shelf life. The antiseptic principle, roughly has the following 3 kinds: one is the enzyme system which interferes with the microorganism, destroys its normal metabolism, inhibits the enzyme activity. Two is to make the microbial protein coagulation and degeneration, interfere with its survival and reproduction. The three is the change of permeability of the cell membrane, exclusion of enzymes and metabolites in product inhibition, leading to its inactivation.

When it comes to preservatives, people tend to think that harmful, in fact, in the safe use of the human body is non-toxic side effects. The use of preservative in our country has strict rules, and the preservative should meet the following standards:

1 reasonable use of the human body harmless;

2 does not affect the digestive tract bacteria;

3 in the digestive tract can be degraded to the normal composition of food;

The use of 4 antibiotics did not affect the drug;

5 do not produce harmful ingredients in the heat treatment of food.

China has so far approved the use of 32 kinds of food preservatives, which are the most commonly used sodium benzoate, potassium, potassium and so on. Sodium benzoate is more toxic than potassium potassium, and in the same pH value, the inhibitory effect is only 1/3 of the acid. But because of the low price of sodium benzoate, it is still widely used in our country, mainly used in carbonated drinks and fruit juice drinks. Potassium, potassium, strong antibacterial ability, little toxic, can participate in the normal metabolism of the human body, into CO2 and water. From the perspective of the development trend of preservatives, biological fermentation and biological preservatives, will become the future trend of development.

One, the following brief introduction of the products used in China, the product performance, corrosion protection mechanism and scope of use.

1, benzoic acid and its salts, white granule or crystalline powder, odorless or slightly benzoin smell. Antiseptic mechanism: sodium benzoate Pro oily big, penetrating cell membrane into the cell body, interfere with the cell membrane permeability, inhibit the absorption of the cell membrane of amino acids, and inhibit the activity of the cells of the respiratory enzyme system, in order to achieve a preservative. The anti-corrosion of the best PH for 2.5 - 4, in more than PH5.0 products, the bactericidal effect is not very ideal. Because of its security is equivalent to the potassium potassium 1/40, Japan has banned its application in food.

2, the acid and its salts, white crystalline powder or slightly yellow crystalline powder or scale. Potassium sorbate acidic preservative, has high antibacterial properties, inhibit the growth of fungi reproduction, which is mainly through the inhibition of microorganisms dehydrogenase system, so as to achieve the inhibition of microbial and antiseptic role. Have inhibitory effect on bacteria, mold and yeast. Anticorrosive effect was significantly higher than that of benzoic acid, which is 5-10 times of benzoate. Product toxicity is low, equivalent to half of salt. The anti-corrosion effect of the PH is decreased with the increase of PH, and the corrosion protection effect is best when = 3. PH value reached 6 when there is still antibacterial capacity, but the minimum concentration can not be less than 0.2%. The toxicity of Binibojin ester is smaller. In our country can be used for soy sauce, vinegar, sauce, beverage, jam etc..

3, the dehydrogenation of acetic acid and sodium salts, dehydrogenation of acetic acid and its sodium salt are white or light yellow crystalline powder, light and thermal stability, degradation in aqueous solution of acetic acid, non-toxic to human body. It is a broad-spectrum preservative, which has a strong inhibitory effect on bacteria, mold and yeast in food. Widely used in meat, fish, vegetables, fruits, beverages, cakes, etc..

4, Nipagin Esters (parabens), the product has the hydroxyl benzoic acid methyl, ethyl, propyl, butyl. Among them, the antiseptic effect of butyl acrylate is best. Our main use of ethyl and propyl paraben. Japan uses the most is the butyl hydroxy butyl benzoate. Parabens antiseptic mechanism is: the destruction of the cell membrane of microorganisms, the intracellular protein denaturation, and can inhibit the activity of the cells of the respiratory enzymes. Nipagin Esters of antibacterial active components is mainly state molecules, due to the hydroxyl groups in the molecule has been esterification, no longer ionization, the pH value is 8 still 60% of the molecules in the presence of. Therefore, in the PH4 range of Nipagin Esters in 8 have good results. Does not change with the change of pH value, the performance is stable and the toxicity is lower than that of benzoic acid. Is a broad-spectrum preservative.

Because of Nipagin Esters are difficult to dissolve in water, so when the first dissolved in ethanol. In order to better play the role of preservatives, it is better to use more than two kinds of the ester mixture. Ethyl-p-hydroxybenzoate used fruit drinks, Propylparaben generally used in fruit drinks.

5, sodium diacetate is a commonly used in pickles preservative, safe, non-toxic, good preservation effect, in the human body final decomposition product into water and carbon dioxide. To Hagen bacteria, Aspergillus flavus, Lester bacteria inhibition effect is obvious. Used in pickles products with 0.2% sodium diacetate and 0.1% potassium sorbate in mixed pickles class, have a very good preservation effect.

6, calcium propionate, white crystalline granules or powder, no odor or slightly slightly acid smell, to light and heat stability, easily soluble in water. Acid is the product of human body amino acid and fatty acid oxidation, so calcium propionate is a good safety preservatives.ADI (human daily per kilogram allowed intake) without