Chitosan oligosaccharide, also known as chitosan oligosaccharide and oligochitosan, is an oligosaccharide product with a polymerization degree of 2 ~ 20 obtained by degrading chitosan by special biological enzyme technology (chemical degradation and microwave degradation technology are also reported). Its molecular weight is ≤ 3200da. It is a low molecular weight product with good water solubility, great function and high biological activity. It has many unique functions, such as high solubility, completely soluble in water, easy to be absorbed and utilized by organisms, and its effect is 14 times that of chitosan.

Gold chitosan oligosaccharide indicates that chitosan oligosaccharide is the only positively charged cationic basic amino oligosaccharide in nature. It is animal cellulose. Chitosan oligosaccharide is a small molecular oligosaccharide with amino group, which is degraded from chitosan derived from shrimp and crab shell. It is a sugar chain with polymerization degree of 2 ~ 20.