Abstract
A theoretical model for filtration of large solutes through a pore in the presence of transmembrane pressures, applied/induced electric fields, and dissimilar interactions at the pore entrance and exit is developed to characterize and predict the experimental performance of a hemofiltration membrane with nanometer scale pores designed for a proposed implantable Renal Assist Device (RAD). The model reveals that the sieving characteristics of the membrane can be improved by applying an external electric field, and ensuring a smaller ratio of the pore-feed and pore-permeate equilibrium partitioning coefficients when diffusion is present. The model is then customized to study the sieving characteristics for both charged and uncharged solutes in the slit-shaped nanopores of the hemofiltration device for the RAD. The effect of streaming potential or induced fields are found to be negligible under representative operating conditions. Experimental data on the sieving coefficient of bovine serum albumin, carbonic anhydrase and thyroglobulin are reported and compared with the theoretical predictions. Both steric and electrostatic partitioning are considered and the comparison suggests that in general electrostatic effects are present in the filtration of proteins though some data, particularly those recorded in a strongly hypertonic solution (10× PBS), show better agreement with the steric partitioning theory.
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Acknowledgments
The project described was supported by NIH Grant Number R01EB008049 from the National Institute of Biomedical Imaging and Bioengineering. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute of Biomedical Imaging and Bioengineering or the National Institutes of Health. The authors thank Prof. Andrew L. Zydney (AZ) of Pennsylvania State University for reviewing the manuscript and for helpful suggestions. The writing and model development for this paper was principally undertaken by SD under guidance from TC and additional guidance from SR and AZ; the experimental results were contributed by WHF and SR.
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Co-authors, WHF and SR, are inventors on one or more patents related to the subject material in this paper, and are entitled to a share of any royalty payments that may derive from commercialization of the patent(s).
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Conlisk, A.T., Datta, S., Fissell, W.H. et al. Biomolecular Transport Through Hemofiltration Membranes. Ann Biomed Eng 37, 722–736 (2009). https://doi.org/10.1007/s10439-009-9642-0
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DOI: https://doi.org/10.1007/s10439-009-9642-0