Many supermarkets now pack fruits and vegetables in sealed bags to keep them in a vacuum environment for preservation purposes. The principle of doing this is to eliminate the oxygen in the bag, because oxygen can promote the proliferation of bacteria and microorganisms, thus causing food spoilage. However, as long as there is a little oxygen in the bag, the microorganisms may breed, so that the preservation time cannot be long.

In order to completely eliminate the oxygen in the bags and keep fruits and vegetables fresh for a longer period of time, a joint research team in Britain and Finland has now invented a new technology. They claim that the use of this technology can completely eliminate the residual oxygen in any package. The team's researchers washed the bags with nitrogen, which contained a small amount of hydrogen, and added a polymer fiber to the package. The fiber was filled with 0.1% platinum metal catalyst, and the bags were sealed. Metal platinum can react with the residual traces of oxygen in the bag to generate water, thus completely eliminating residual oxygen.

Some people think that this method is good, but platinum is a very expensive metal, making the entire technology costly. However, the inventors claimed that the amount of platinum used is very small, accounting for only 0.1% of the weight of the fiber, and it is still very cost-effective compared with the profit that can be obtained from long-term preservation of vegetables. For this reason they have applied for a patent in the United States.