Relationships between the molecular structure and moisture-absorption and moisture-retention abilities of succinyl chitosan

摘要

N-Succinyl chitosan(NSC)with various degrees of deacetylation(DD 6-94%)and substitution(DS 0.14-0.79)were successfully prepared from N-acetylchitosans in varying reaction time.Infrared spectroscopy(IR),~1H NMR and gel-permeation chromatographic(GPC)techniques were used to characterize their molecular structures.The moisture-absorption(R_a)and-retention(R_h)abilities of NSC are closely related to the DD and DS values.Under conditions of high relative humidity,the maximum R_a and R_b were obtained at DD values of about 50%,and when the DD value deviated from 50%,R_a and R_h decreased.Under dry conditions,when the DD value was 50%,the R_h was the lowest.The NSC with DS 0.65 to 0.79 exhibited better R_h than that of HA,and has the potential to prepare HA-like substances in pharmaceutical and cosmetics industries.