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Clinical Chemistry 36: 1906-1910, 1990;
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Clinical Chemistry, Vol 36, 1906-1910, Copyright © 1990 by American Association for Clinical Chemistry

Evaluation of dialysis treatment in uremic patients by gel filtration of serum

J Osada, T Gea, C Sanz, I Millan and J Botella
Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111.

A group of substances of molecular masses between 300 and 1500 Da have been found to be toxic metabolites in patients with uremia. We determined the concentration in serum of these molecules in the following groups of patients: two hemodialyzed groups (one with cuprophane and the other with polyacrylonitrile dialyzers), one group treated with continuous ambulatory peritoneal dialysis, one group of nondialyzed azotemic patients, and one control group of healthy persons. Ultrafiltrates of the subjects' sera were fractionated on Sephadex G-15 followed by ion-exchange chromatography. Eluates were monitored by absorbance at 254 and 206 nm. Partially characterized peaks P1 and P2, obtained by gel filtration, correlated with the concentration of creatinine in serum; their concentrations were significantly (P less than 0.01) larger in hemodialyzed groups than in peritoneal dialyzed or in nondialyzed azotemic patients. After ion- exchange chromatography, two peaks (P'5 and P'6) correlated with serum creatinine and also were larger in hemodialyzed patients than in the other groups. Apparently, adequate discrimination is obtained by gel- filtration analysis and further analysis by ion-exchange chromatography does not provide additional information in most of the affected patients.


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Copyright © 1990 by the American Association for Clinical Chemistry.