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Hydrophilic Modification of Dialysis Membranes Sustains Middle Molecule Removal and Filtration Characteristics

Authors :
Adam M. Zawada
Karlee Emal
Eva Förster
Saeedeh Saremi
Dirk Delinski
Lukas Theis
Florian Küng
Wenhao Xie
Joanie Werner
Manuela Stauss-Grabo
Matthias Faust
Skyler Boyington
James P. Kennedy
Source :
Membranes, Vol 14, Iss 4, p 83 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

While efficient removal of uremic toxins and accumulated water is pivotal for the well-being of dialysis patients, protein adsorption to the dialyzer membrane reduces the performance of a dialyzer. Hydrophilic membrane modification with polyvinylpyrrolidone (PVP) has been shown to reduce protein adsorption and to stabilize membrane permeability. In this study we compared middle molecule clearance and filtration performance of nine polysulfone-, polyethersulfone-, and cellulose-based dialyzers over time. Protein adsorption was simulated in recirculation experiments, while β2-microglobulin clearance as well as transmembrane pressure (TMP) and filtrate flow were determined over time. The results of this study showed that β2-microglobulin clearance (−7.2 mL/min/m2) and filtrate flow (−54.4 mL/min) decreased strongly during the first 30 min and slowly afterwards (−0.7 mL/min/m2 and −6.8 mL/min, respectively, for the next 30 min); the TMP increase (+37.2 mmHg and +8.6 mmHg, respectively) showed comparable kinetics. Across all tested dialyzers, the dialyzer with a hydrophilic modified membrane (FX CorAL) had the highest β2-microglobulin clearance after protein fouling and the most stable filtration characteristics. In conclusion, hydrophilic membrane modification with PVP stabilizes the removal capacity of middle molecules and filtration performance over time. Such dialyzers may have benefits during hemodiafiltration treatments which aim to achieve high exchange volumes.

Details

Language :
English
ISSN :
20770375
Volume :
14
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Membranes
Publication Type :
Academic Journal
Accession number :
edsdoj.bd54689e804a66a0d761278b956152
Document Type :
article
Full Text :
https://doi.org/10.3390/membranes14040083