Table 1.
Physico-chemical properties of chitosan and chitosan derivatives (reported in [42]). Two commercial samples of Very-Low-MW and of Low-MW and three derivatives, a trimethyl-substituted (TM-chit), a galactosyl- (Gal-chit) and a glucosyl- (Glc-chit) substituted are reported. The molecular weight of the commercial LMW sample is given to be approximately 50,000–190,000 daltons based on viscosity. TM-chit contains also substitution on O6 and O3. The sugar substituent, gal or glc, is linked to ammine via an open sugar chain, since a disaccharide is the reactant. DS (non-acetyl substitution) determined by NMR. The column “Recovery” is a parameter relevant for the data to be representative of the sample investigated.
| DS | Mw | Mn | Mw/Mn | [η] | Rh | Rg | Recovery | |
|---|---|---|---|---|---|---|---|---|
| kg/mol | kg/mol | dL/g | nm | nm | % | |||
| VLMW-chit | - | 30 | 18 | 1.7 | 0.7 | 6.4 | - | 94 |
| LMW-chit | - | 128 | 56 | 2.3 | 2.3 | 15.3 | - | 82 |
| TM-chit | 0.71 | 109 | 46 | 2.3 | 0.7 | 9.7 | - | 80 |
| Gal-chit | 0.50 | 473 | 102 | 5.1 | 1.9 | 21.3 | 50.8 | 99 |
| Glc-chit | 0.42 | 554 | 96 | 6.4 | 2.4 | 23.8 | 61.7 | 93 |