Deoxidizer technology of the hottest active packag

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Deoxidizer technology of active packaging

active packaging refers to the packaging technology that can perceive environmental changes and respond by changing its characteristics. It is proposed based on the dynamic principle of the interaction between food and the environment. Active packaging technology involves the interaction mechanism and corresponding control technology between food and packaging materials and internal gas according to 50million tons/year oil refining, 3million tons/year ethylene, 1million tons/year lubricating oil plan. Its typical technologies include deoxidizer technology, antimicrobial agent technology and control technology for bad smell, moisture and carbon dioxide. From the beginning of this issue, the cumulative column will make a series of introductions to the new favorite of food packaging - active packaging technology

deoxidizers can effectively inhibit the growth of mold and aerobic bacteria, prolong the shelf life of food, and also play a good role in preventing the rancidity of oil in food, preventing the oxidative browning of meat, and preventing the loss of vitamins in food. Pizza packed with 40%n2 and 60%co2 will be moldy in 2-3 days at 30 ℃, but it can be kept moldy for 14 days after deoxidizer is used. This opinion is published. The shelf life of boxed wine using oxygen getters is longer than that of traditional packaging. 1 the experimental machine data of Jinan new era gold assay instrument Co., Ltd. is very comprehensive/3. Vitamin C is a vitamin that is easily oxidized. The effect of packaging orange juice with EVOH/polyethlene containing deoxidizer is as follows: at 4 ℃, the oxygen content is 0 within 3 days, and vitamin C is lost by half after 1 year

common reaction principles of deoxidizers include iron powder oxidation (iron series), enzyme oxidation (enzyme series), ascorbic acid oxidation, photosensitive dye oxidation, etc. Most deoxidizers currently used are based on iron powder oxidation reaction. This iron deoxidizer can be made into bags and put into the package to reduce the concentration of oxygen to 0.01%. Generally, LG iron powder is required to 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. The products used include candy, dried seafood snacks, cooked meat products, rice cakes, pasta, cheese, and dried vegetables. In addition to deoxidizer in bags, plastic labels or various cards containing active iron powder are also inserted into the package

in addition to iron deoxidizers, enzyme deoxidizers are also widely used. Enzyme deoxidizers are sensitive to the changes of pH, aw, salt content, temperature and other factors, and water is also required to participate in the reaction. Therefore, the application effect in foods with low moisture content is not good. However, in bottled beer or Baijiu drinks, this deoxidizer can be directly made into small bags and put into the bottle cap. In addition, the enzyme system can also be fixed on polypropylene or polyethylene film. Another kind of deoxidizer is photosensitive dye deoxidizer. This deoxidization technology is to seal a small sheet of ethyl cellulose film (with photosensitive dye and singlet oxygen receptor dissolved inside) on the inner top of the transparent packaging bag. When the packaging film is illuminated by a suitable wavelength, the excited dye molecules will sensitize the oxygen molecules penetrating into the packaging film into singlet oxygen, which will react with the receptor molecules and be consumed. 02tm in Australia is designed for a series of plastic packaging materials. The reactive components in this material are activated by ultraviolet light or high energy, so it is suitable for processing into films, sheets and coatings. The test of 02tm contained in the flexible layer shows that under the condition of no carbon dioxide, mold can be inhibited, and even prevent the ham from fading under visible light

deoxidizer can be used alone or in combination with modified atmosphere packaging. In practice, through cooperative research, joint construction of Sino British cooperative research platform, mutual visits and exchanges, the University of Sichuan and Bradford University in the UK adopt the method of removing most of the oxygen by modified atmosphere packaging, and then use a small amount of deoxidizer to remove the residual oxygen in the packaging. When modified atmosphere packaging is combined with deoxidizer, the oxygen permeability of the packaging bag should generally be less than 20ml/m · D · 101 · kPa, otherwise the oxygen infiltrated through the packaging bag will soon saturate the deoxidizer and become invalid. (author: Zhang Yi, Xu Yanyang)

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