In:
Hemodialysis International, Wiley, Vol. 19, No. S3 ( 2015-10)
Abstract:
Vitamin E (vit E ) is coated on polysulfone ( PS ) dialysis membrane for antioxidative purpose. The membrane, however, has not yet been evaluated from the mass transfer point of view. We investigated this PS membrane with and without vit E coating in vitro ultrafiltration experiments to identify whether or not the coating influences the mass transfer. Dialyzers that included PS membrane with and without vit E coating were investigated. Aqueous test solution of various solutes including vitamin B 12 ( VB 12 , MW 1355), chymotrypsin (chymo, MW 25000), and albumin (alb, MW 66000) was prepared, and normal ultrafiltration experiments were performed at 310 K . Reverse ultrafiltration experiments in which test solution was filtered from outside to inside the hollow fiber were also performed. Sieving coefficients ( SC ) were computed for evaluation. SC for VB 12 was the same regardless of vit E coating; however, chymo was 0.82 ± 0.01 and 0.86 ± 0.01, respectively, for the membrane with and without vit E. Thus, it would be understood that vit E coating reduces the pore size of the membrane, resulting the reduced transport of larger solutes. Like other PS membrane, SC for alb was decreased over time regardless of vit E coating. More importantly, although the steady‐state SC for alb was almost identical in two membranes, PS without vit E showed much greater decrease for the first 2 h, while that with vit E showed very little decrease over time, which suggested the reduced fouling effect due to vit E coating. All the SC values found in reverse ultrafiltration were higher than those found in normal ultrafiltration; moreover, the degree of increase with chymo was approximately 5%, whereas that with alb was approximately 430%, which may be explained by a new model in which wedge effect is taken into consideration for the membrane transport. Vit E coating not only has antioxidative effect but also reduces the fouling that is usually caused by various proteins.
Type of Medium:
Online Resource
ISSN:
1492-7535
,
1542-4758
DOI:
10.1111/hdi.2015.19.issue-s3
Language:
English
Publisher:
Wiley
Publication Date:
2015
detail.hit.zdb_id:
2103570-2
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