Permeability properties of gels and membranes derived from chitosan

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Abstract
A series of membranes was prepared by air-drying the thin layers of N-acyl- and N-arylidene-chitosan gels. Their flow rates of water and permeabilities of various compounds were examined. N-Acylchitosan membranes were stable in both dilute acid and alkali, but N-arylidene-chitosan membranes were unstable in dilute acid. N-Acetylchitosan membranes were stable in formic acid at room temperature for up to 7 hr. The flow rates of water through N-acetylchitosan membranes were 10.0–23.6 × 10−3 ml/cm2 min under a pressure of 3 kg/cm2, and were unchanged by the membrane thickness (12–60 μm). The increase of carbon numbers for N-acyl groups caused a slight decrease in the flow rates, and the flow rates were decreased by partial O-acetylation of N-acetylchitosan membranes. The flow rate of water through chitosan membranes (thickness 30–35 μm) was 7.1 × 10−4 ml/cm2 min, which was decreased by an increase in the membranes thickness. Low-molecular-weight compounds (MW < 2900) passed through these membranes, but high molecular-weight compounds (MW > 13,000) did not pass through.