Abstract
Low molecular weight studies often exhibit elution characteristics on gel filtration columns which deviate from ideal behaviour. In many previous studies this anomalous behaviour was attributed to the existence of extremely narrow pores in the gel, inaccessible even to very small solute molecules, to explain K d values lower than unity. K d values of small solutes higher than unity were usually ascribed to adsorption of the solute to the gel matrix. In the present paper several observations are presented that contradict these suggestions. Experimental evidence indicates that with small solute molecules K d values differing from unity can be fully explained by the anomalous properties of vicinal water layers at the gel matrix-water interface.
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