1、origin: snow crab shell

2、preparation: monomers of chitosan oligosaccharide are made from crab shell, and obtained by enzymatic hydrolysis, chemical derivatization and column chromatography, the degree of polymerization is from 2 to 10.

3、character: they are white or light yellow power or flocculent lyophilized things, with odor free and humidifying.

4、toxicity: non-toxic

5、shelf life: ≥ 3 years under frozen state

6、inspection: tlc, hplc, esi-ms

7、application: chitosan oligosaccharide standards can be developing chitosan oligosaccharide’s applications in pharmaceuticals, foods, modern agriculture, feed, daily chemical industry and biochemical reagents. they are reference substances in assay, analysis and quality control. they could also be applied in research fields of carbohydrate chemistry and glycobiology, such as preparation of oligosaccharide microarray, the interaction between oligosaccharide and protein, and structure-activity relationship and mechanism of oligosaccharide-derived medicine.