Study of carbohydrate material isolated from ultrafiltrates in patients with chronic renal failure.

: We have isolated substances of molecular weight ranging between 350 and 2,000 daltons from ultrafiltrates of 3 patients treated by maintenance haemodialysis for chronic renal failure. Such substances might have a role in the genesis of uraemic toxicity. We have chiefly studied their carbohydrate content. Material was fractionated according to a procedure previously used to urine in healthy controls. Consecutive ion exchange, charcoal Celite and paper chromatography lead to the isolation and purification of oligosaccharides, glycopeptides, glucuronoconjugates and peptides. The different classes of carbohydrate material present in dialysis fluids from uraemic patients are close to those formed in normal urines. All the oligosaccharides in renal failure urine had have identified in normal urine. In a previous studies we have demonstrated that the levels of glucuronoconjugates are higher in the blood of uraemic patients. The glucuronoconjugates and their aglycones could have a toxic effect but a great part of them is removed by hemodialysis.