Preparation and characterization of carboxymethylated beta-chitins and their abilities of moisture absorption and retention.
Carboxymethyl chitins (CM-chitins) with a high degree of substitution (DS), a low degree of deacetylation (DD), and high molecular weight were prepared directly from beta-chitin and characterized using (1)H NMR, FT-IR, TA, potentiometric titration, and elemental analysis methods. CM-chitins with different molecular weight were prepared using ultrasonic degradation method. Their abilities of moisture absorption and retention were investigated. The moisture-absorption ratio and moisture-retention ratio of CM-chitins increased as their DS increased. The moisture-absorption ratio and moisture-retention ratio of CM-chitins with high DS were close to that of hyaluronic acid (HA). The effect of molecular weight (>10(6)) of CM-chitin on its moisture-absorption ratio and moisture-retention ratio is neglectable.
Huang
Xinzheng
X
Faculty of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, PR China.
Wu
Yiguang
Y
Wei
Shaohui
S
Liao
Chuangdong
C
Chen
Qunying
Q
D000042:Absorption; D000818:Animals; D002686:Chitin / Q000737:chemistry*; D008970:Molecular Weight; D014867:Water / Q000737:chemistry
D014867:Water; D002686:Chitin