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Citation: CHEN Ling-Yun, DU Yu-Min, XIAO Ling, QIN Cai-Qin. Study on the Substitution and Moisture-Retention Capacity of Carboxymethyl Chitosan[J]. Chinese Journal of Applied Chemistry, ;2001, 18(1): 5-8. shu

Study on the Substitution and Moisture-Retention Capacity of Carboxymethyl Chitosan

1.
college of chemistry and Environment Science, Wuhan University, Wuhan 430072

Received Date: 29 March 2000
Available Online: 19 July 2000
Fund Project: 国家自然科学基金资助课题(29977014) (29977014)

A series of N,O-carboxymethylchitosan(CM-chitosan) were prepared. The position and degree of substitution were determined by potentiometric titration, IR and ¹³C NMR. The results indicated that the degree of substitution of the compounds increased significantly with decrease of molecular weight of chitosan and the carboxymethylation reactivity decreased in the order OH-6 >OH-3 >NH₂. The moisture-absorption and moisture retentio-properties of CM-chitosans and moisture-retention properties of CM-chitosans were found quite similar to those of hyaluronic acid. The moisture absorbability increased with increasing in molecular weight and moisture retention capacity of CM-chitosas with the degree of substitution. The CM-chitosans with molecular weight from 0.56×10⁴ to 8.6×10⁴ and degree of substitution greater than 1.0 had better moisture-absorption moisture retention capacity than hyaluronic acid.
- carboxymethylchitosan,
- moisture-absorption,
- moisture retention,
- substitution degree,
- molecular weight
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