Abstract
The rotational mobility of a cationic nitroxide spin probe in carboxyethyl cellulose, sulfoethyl cellulose and phosphoric cellulose membranes was investigated by electron spin resonance (ESR). The rotational motion of the probe was observed to be almost isotropic. The mobility of the probe in these membranes decreased to 30_??_50% of that in aqueous solution and was thought to be affected by the charge density and the state of water in the membranes. The rotational correlation time, τR, in water-swollen membranes was smaller than that in dried membranes by a factor of 103_??_104
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