Chemical name: β-(1→4)-2-amino-2- deoxy -D-dextran
Molecular formula: (C6H11NO4)n(n=2~20)
Molecular weight (MW):  less than 3000
Chemical structure:

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The absorptivity of chitosan oligosaccharide in human body is nearly 100%, and its efficiency is multiple times of that of chitosan. Chitosan oligosaccharide has functions such as raising immunity, restraining growth of cancer cell, promoting formation of liver and spleen antibody, promoting absorption of calcium and mineral substance, proliferating bacteria beneficial for human body such as bifidobacteria and bacterium acidi lactici, lowering blood lipids, blood pressure and blood sugar, regulating cholesterin, losing weight, preventing adult diseases. Therefore, it can be used in medicine field, functional food field and other fields. Chitosan oligosaccharide can obviously eliminate negative oxygen ion free radical from human body, activate body cells, defer senility, depress growth of harmful bacteria on skin surface and can keep moisturized very well, so it is fundamental raw material in daily chemical field. Chitosan oligosaccharide is not only water-soluble and used conveniently, but also is able to depress putrefying bacteria remarkably. With lots of functions, chitosan oligosaccharide is an excellent natural food antiseptic and preservation agent. Besides, chitosan oligosaccharide can effectively increase production of fruits and vegetables, prevent and cure insect attack and proliferate beneficial bacteria in soil and biological bacteria fertilizer, so it is named as a non-pesticide "pesticide" and non-chemical fertilizer "chemical fertilizer". With such special dual effect of pesticide and chemical fertilizer, chitosan oligosaccharide is therefore applied in agricultural field widely.