Abstract:

The effects of several extrinsic physical fields, such as the magnetic field, the ultrasonic wave and the microwave irradiation, on the rate and yield of chitosan-Fe（ Ⅱ ） complexing reaction were investigated. The results show that ultrasonic has the greatest effect on the reaction rate and complexing capacity, followed by the magnetic field and the microwave irradiation, and that there is a threshold for the enhancement by the physical fields. UV and IR spectra show that the structure of chitosan-Fe（ Ⅱ ） complex treated with magnetic field is almost the same as that of the control. The authors also propose the enhancement mechanisms of the complexing reaction by the three physical fields in the end.

Key words: chitosan, Fe（ Ⅱ ）, complexing reaction, magnetic field, ultrasonic, microwave irradiation