Albumin, total-cresol and IL-6 concentrations in ultrafiltrate samples collected before and after the HFR sorbent cartridge at the beginning and at the end of the dialysis session.

The data shown in the Table are the mean ± standard deviation of albumin, total cresol and IL-6 measured in samples of the UF collected before and after being adsorbed by the sorbent cartridge of the convection stage of the HFR Supra apparatus. Note the very low concentrations of albumin in pre-sorbent UF samples that is consistent with the low sieving coefficient (about 0.02 for albumin) of the polyphenylene membrane of the system. The values of total cresol concentration shown are the sum of p-cresol and p-cresol metabolite concentrations because, as we detail in the methods section, the acidic extraction method that we used converts all p-cresol derivatives in p-cresol.*p†p