An oxygen absorber, also known as an oxygen scavenger, is a small packet or sachet that is used to remove or reduce oxygen levels in packaged food and other products. It is a common tool in the food industry to maintain product freshness, extend shelf life, and prevent spoilage.

The principle behind oxygen absorbers is the chemical reaction between iron powder and the oxygen present in the packaging. The most commonly used oxygen absorbers contain iron powder, salt, and an activator, such as activated carbon. When the packet is exposed to oxygen, the iron powder reacts with it, forming iron oxide and effectively removing the oxygen from the surrounding environment.

Here are some key points about oxygen absorbers:

1. Function: Oxygen absorbers are designed to protect packaged goods by reducing or eliminating the presence of oxygen, which is a key factor in food spoilage. Oxygen can lead to oxidation, mold growth, rancidity, and the proliferation of aerobic bacteria.

2. Shelf Life Extension: By removing oxygen, oxygen absorbers help to extend the shelf life of various products, including dry foods, snacks, grains, cereals, dehydrated fruits and vegetables, nuts, processed meats, and other oxygen-sensitive items.

3. Preservation of Quality: Oxygen absorbers help preserve the color, flavor, texture, and nutritional value of packaged foods. They can prevent the oxidation of fats and oils, maintain crispness in snacks, and inhibit the growth of bacteria and molds.

4. Packaging Compatibility: Oxygen absorbers are typically used in packaging that provides a barrier to oxygen, such as vacuum-sealed bags, foil pouches, or cans. The packaging must be airtight to prevent oxygen from re-entering the package after the absorber has done its job.

5. Different Absorption Capacities: Oxygen absorbers come in various sizes and absorption capacities, measured in terms of oxygen-absorbing capacity, often referred to as CC (cubic centimeters) or O2 capacity. The appropriate absorber strength depends on the volume of the package and the oxygen levels to be reduced.

6. Safe and Non-Toxic: Oxygen absorbers are safe to use in food packaging. The materials used, such as iron powder and salt, are non-toxic and approved for use in food applications. However, the packets themselves are not edible and should be kept away from children and pets.

It is important to note that oxygen absorbers should be used as directed by the manufacturer and in conjunction with proper packaging techniques to ensure optimal results in preserving food quality and safety.