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Abstract
We reported previously inhibition of Na+,K+-ATPase by a fraction (fraction 2–3) of medium size uremic toxins. Due to considerable amount of sulfates in this fraction, a semi preparative high performance liquid chromatography turned out to be inadequate to isolate the active compound. Therefore we developed a novel chromatographic method using ion exchanger Sephadex QAE A25 in acidic medium. This method allows the elimination of sulfates and the partial purification of the active component.