According to overseas media reports, Mitsubishi Heavy Industries Japan and Takara Bio Inc. of Japan have successfully developed an "allergen removal filter" that uses enzymes to decompose and inactivate bacteria, fungi, viruses, and allergens such as alfalfa and pollen.
In the past, Mitsubishi Heavy Industries has developed an "enzyme-intensive sterilizing filter" for bacteria and fungi that have been collected through water decomposition and elimination of filters by natural enzymes. In 2002, it has been used in home air conditioners, commercial air-fallers, and air purifiers. Through further research, this development has succeeded in removing bacteria, fungi and viruses, as well as decomposing and inactivating allergens such as mite allergens, cat allergens and pollen.
Because allergens bind strongly and their chemical properties are stable, they are particularly difficult to decompose. The "allergen removal filter" adds urea to the enzyme. First, the secondary structure of allergens is destroyed by the aid of urea, and then the primary structure of the allergen is decomposed by enzymes, so that it can be effectively inactivated.
Mitsubishi Heavy Industries will deploy an "allergen removal filter" in a new home air conditioner scheduled for release in January 2004. After that, it is planned to gradually apply it to products such as commercial air conditioners, automotive air conditioners and air purifiers.

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