Deoxidizer is also known as free oxygen absorber, free oxygen remover, etc. It is a substance that can absorb oxygen.

Introduction:

Deoxidizer, also known as deoxidizer, oxygen absorber, is an additive that can absorb oxygen and slow down the oxidizing effect of food, and it is a new product that is being used in food preservation. It is a group of easy to react with free oxygen or dissolved oxygen chemical mixture, it is installed in a certain degree of air permeability and strength of the sealed paper bag, as desiccant bag, in the food bag and food sealed package, can remove the bag of oxygen residue in the air, to prevent the food due to oxidation discoloration, deterioration and rancidity of fats and oils, but also on the growth of molds, aerobic bacteria and food pests have an inhibitory effect. At present, the deoxidizer is not only used to maintain the quality of food, but also used for grain, feed, medicine, clothing, fur, precision instruments and other types of items such as preservation, rust prevention.

Application:

Deoxidizer as a new material for food preservation has its unique advantages. It is installed in the same container with food, and the deoxidizer absorbs the oxygen in the container, so that the container is oxygen-free, and the food can be preserved. However, the raw material of deoxidizer must have stable reaction, no strange taste and no harmful gas generation and other side effects, in case of accidental consumption of human body is also harmless. Deoxidizer is generally iron powder as the basic raw material, used in general food, can maintain food quality and extend shelf life, used in health food can prevent oxidation of fats and oils, to prevent discoloration and maintain nutrients. Foreign countries have been deoxidizer widely used in wet bread flour, wet noodles, wet vermicelli, wet snacks, semi-dry fish products and other foods. At present, the form of deoxidizer in addition to bags, there are caps. Bagged for bagged food, cap is used for bottles, cans and other containers. In recent years, with the development of the food industry and the improvement of packaging materials, deoxidizer in the country more and more attention, the application is more and more extensive.

Principle:

Oxygen is one of the important factors causing food spoilage. Food has many components are closely related to the presence of oxygen. From the biochemical point of view, fat will oxidize in the presence of oxygen, vitamins and a variety of amino acids will lose nutritional value, oxygen will also make the unstable pigment discoloration or discoloration; from the microbiological point of view, most of the microorganisms will be in the presence of oxygen in a good environment, even if the content of oxygen in the packaging environment is as low as 2 ~ 3%, most of the aerobic and parthenogenetic anaerobic bacteria can still grow, and biochemical reactions will still be carried out. Therefore, it is of great practical significance to remove oxygen in packaging. Through the chemical reaction, a short period of time to remove the oxygen in the closed container, so that the food is in an anaerobic state (O2 concentration of 0.01% or less), effective control of bacteria, mold and other microbial growth, to prevent the oxidation of fats and oils, which can effectively maintain the color, aroma and taste of food, to prevent oxidative damage to vitamins and other nutrients, prolonging the shelf-life of food.

Deoxidizer can be divided into two kinds according to its composition: (1) is an inorganic matrix as the main body of the deoxidizer, such as Reduction of iron powder. The principle is that iron powder in the presence of oxygen and water vapor, is oxidized to iron hydroxide. Another example is sulfite deoxidizer, which is the main agent of Liandi sulfite, Ca(OH)2 and activated carbon as the secondary agent, and the reaction is carried out in the environment of water. (2) It is based on organic substrates as the main agent, such as enzymes, ascorbic acid and oleic acid. Ascorbic acid (AA) itself is a reducing agent, in the presence of oxygen, with copper ions as a catalyst can be oxidized or dehydrogenated ascorbic acid (DHAA), so as to remove oxygen in the environment, commonly used in this method to remove oxygen in liquid food, ascorbic acid deoxidant is currently used in the deoxidant of a higher security, enzyme deoxidants commonly used is glucose oxidant alcohol, which is used to use the consumption of oxygen when the glucose oxidation into gluconic acid. It uses the consumption of oxygen when glucose is oxidized to gluconic acid to achieve the purpose of deoxygenation.

The common reaction principle of deoxidizer is iron powder oxidation (iron system), enzyme oxidation (enzyme system), ascorbic acid oxidation, photosensitive dye oxidation and so on. Most of the deoxidizers currently in use are based on the iron powder oxidation reaction. This iron-based deoxidizer can be made into a bag and put into a package to reduce the oxygen concentration to 0.01%. It is generally required that 1g of iron powder can react with 300mL of oxygen, and the appropriate dosage can be selected according to the amount of oxygen remaining after packaging and the oxygen permeability of the packaging film when used. The applied products include candy, dried seafood snacks, cooked meat products, rice cakes, pasta, cheese, dried vegetables. In addition to bagged deoxidizers, plastic labels or various cards containing activated iron powder are inserted into the package.?

The iron deoxidizer, enzyme deoxidizer is also widely used. Enzymatic deoxidizers are sensitive to changes in pH, Aw, salt content, temperature and other factors, and also require the participation of water in the reaction, so the application of low moisture content of food is not effective. However, in bottled beer or white wine drinks, this deoxidizer can be directly made into a sachet and put into the bottle cap. Alternatively, the enzyme system can be immobilized on polypropylene or polyethylene membranes. There is also a class of deoxidants is light-sensitive dye deoxidants, this deoxidant technology is in the transparent bags of the top of the inner seal of an ethyl cellulose membrane booklet (internal dissolution of photosensitive dyes and single-line oxygen receptor), when the packaging film is subjected to appropriate wavelengths of light, the excitation of the dye molecules will be in the environment of oxygen molecules penetrate into the membrane of the oxygen sensitized into a single line of oxygen molecules, the single-line oxygen molecules with the acceptor molecules to be consumed by the reaction. This mono-linear oxygen molecule reacts with the receptor molecule and is consumed. Australia's 02TM is designed for a range of plastic packaging materials where the reactive components are activated by UV light or high energy and are therefore suitable for processing into films, sheets and coatings. Tests of 02TM in flexible layers have shown that mold is inhibited in the absence of carbon dioxide, even preventing ham from fading in visible light.