Progress of study on preparation of oligochitosan and chitobiose by degrading chitosan;

The use of element analysis、infrared spectroscopy and x-ray diffraction for characterization of oligochitosan are examined,it was found that,comparing with raw material,both the degree of deacetylation and nitrogen content of oligochitosan prepared by radiation degradation were remarkably increased.

The oligochitosan with molecular mass about 5000 was obtained by cellulase depolymerization with membrane technology within 5 h and the recovery rate .

N-benzylidene chitosan oligosaccharide (NBCOS) and O-2-hydroxypropyltrimethylammonium chloride chitosan oligosaccharide(OHCOS) were synthesized from chitosan oligosaccharide (COS).

O-carboxymethyl chitosan oligosaccharides,having various degrees of substitution(DS were 0.

N,O-carboxymethyl chitosan oligosaccharides(NOA,NOB and NOC)with various degrees of substitution(DS) were prepared by the etherification of chitosan oligosaccharide and characterized by FTIR.

Effect of Mn (Ⅱ) on the degradation preparation of low molecular weight chitosan from chitosan;

The O ·- 2 scavenging activity of low molecular weight chitosan(LMC) and its complexes with Cu(Ⅱ), Co(Ⅱ), La(Ⅲ) was investigated.

Molecular weight of water soluble low molecular weight chitosan was determinated by GFC.

Preparation and anticancer activity of chitooligosaccharide porphyrins metallic complexes;

Study on Preparation of Chitooligosaccharide by Photocatalysis and Cellulase;

Study on the Chitooligosaccharide on Rice

The motivation for intending low-molecular-weight chitosan,the molecular of viscosity average was 1.

Study on Radiation Protection of Hemopoietic System of Oligo-Chitosan for Mice