Oxygen absorber development.
Earlier in the 20th century, a number of chemicals were incorporated into food products to absorb residual oxygen, including ascorbic acid and glucose oxidase/catalase (Brody et al. 2001). During the 1960s dithionite, calcium hydroxide, activated carbon, and water were incorporated into a system and used in Japan for oxygen scavenging properties which was also patented (Bloch 1965). By the 1970s, the use of plastic packaging varying in oxygen permeability started to be widely used. Concerns regarding the oxidation by residual oxygen and also the oxygen which transmits through the packaging material lead to the development of chemical means of oxygen removal by using packets or sachets within the package, which saw the beginnings of new category of packaging called active packaging, including oxygen absorbers.
Why does the foods need to use oxygen absorber?
Oxygen absorbers absorb oxygen and effectively reduce the aerobic environment to 0% oxygen. Therefore aerobic bacteria and fungi are unable to grow in this environment. Then the oxygen adsorbent bags can protect packaged food and other products against spoilage, mold growth, color change, loss of nutritive values and loss of quality by removing residual oxygen inside the packaging (to below .01%). The components of an oxygen absorber vary greatly, depending on what it is being used for. Most adsorptions, an admixture of iron powder, sodium and activated carbon (charcoal) etc. have been proven quite effective. Meanwhile, the contents are safely contained in the packet and does not contaminate the food.
Oxygen and moisture are the two most important elements to lead foods damp, mildew and spoiled. Our factory - Hongda have a special type of adsorbent with dual functions which can not only take out the oxygen but also absorb the moisture from a sealed package products.
How to measure the oxygen in product's container?
Oxygen in container(mL)= ( Air volume of container( ml ) - weight of product(g)/ specific gravity) * 0.21
Models & oxygen adsorption
How to test the oxygen absorber's adsorption capacity?
There are two testing methods here for you.