4. Conclusion
Ethylamine hydroxyethyl chitosan (EHCs) with good
water solubility was prepared via a novel processing technique,
the optimum reaction conditions were determined
as follows: temperature 70–80 C; the molar ratio of HECs
to chloroethylamine hydrochloricde, 2:1 and reaction time,
12 h. FTIR and 13C NMR confirmed that the quaternary
amino salt group was introduced onto chitosan. The paper
suggested that EHCs decreased the intermolecular interactions,
such as van der Waals forces, and then increased
water solubility. Derivate showed good inhibition effects
against E. coli, while the factor which affected the antibacterial
activity most was NH2%.