Glutaraldehyde is a colorless or yellowish clear liquid with a slightly irritating special smell, which is soluble in water, ether, ethanol and other organic solvents. There are not many free forms in aqueous solutions, with a large number of different forms of hydrates, while most of them are in the form of cyclic hydrates. Glutaraldehyde is active, easy to polymerize and oxidize, and will react with compounds containing active oxygen and nitrogen. The reaction with protein is mainly the reaction between carbonyl group and amino group in protein molecule. Among known aldehydes, Glutaraldehyde is the best protein crosslinker. Glutaraldehyde has excellent bactericidal properties. Glutaraldehyde has little effect on the activity of this enzyme. Most enzymes can be fixed, cross-linked and not inactivated under controlled conditions. Because Glutaraldehyde has many excellent characteristics, it has attracted great attention and has been widely used.