Water swollen and ion exchange property of chitosan membranes

Water swollen and ion exchange property of chitosan membranes
การบวมน้ำและการแลกเปลี่ยนประจุของเยื่อบางไคโตแซน

Ratchanok Sungkum, Biophysics Laboratory, D. of Physics, F. of Sci., PSU.
Pikul Wanichapichart, Asst. Prof., D. of Physics, F. of Sci., PSU.
Darunee Bhongsuwan, D. of General Science, F. of Sci., PSU.
Corresponding e-mail : vpikul@ratree.psu.ac.th

Grant : Prince of Songkla University
Presented : The 26th Congress on Science and Technology of Thailand, 18-20 October 2000, Bangkok
Key words : water swelling, diffusion potentials, the Nernst-Planck Equation, permeability ratio

Five chitosan membranes were prepared from a mixture of chitosan and acetic acid as 1 : 100 (w/v). ZC5 membranes with 10% acetic showed greater percentage of water content than ZC10 membranes with 1% acetic. Home-made chitosan with 1% acetic content, ZH10, showed smaller percentage of water absorption than ZC10. It was found that 1% glutaraldehyde had no effect on the water swelling property of the membranes if the substance was added in the mixture containing 1% acetic acid. Tests on ionic exchange were made by allowing both membrance surfaces contact with different KCl concentration. Diffusion potentials measured implied that permeation of chloride ions through the subskin layer was in all cases slightly greater than through the skin layer. Permeability ratios between chloride and potassium ions (P_Cl/P_K) of ZHXI11 and ZHXI12 membranes were slight-ly greater than of ZH10, and P_Cl/P_K permeability of ZC10 was significantly different from that of ZHXI11.

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