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Characterization of the Concentration-Dependence of Solute Diffusivity and Partitioning in a Model Dextran–Agarose Transport System

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Abstract

This study reports experimental measurements of solute diffusivity and partition coefficient for various solute concentrations and gel porosities, and proposes novel constitutive relations to describe these observed values. The longer-term aim is to explore the theoretical ramifications of accommodating variations in diffusivity and partition coefficient with solute concentration and tissue porosity, and investigate whether they might suggest novel mechanisms not previously recognized in the field of solute transport in deformable porous media. The study implements a model transport system of agarose hydrogels to investigate the effect of solute concentration and hydrogel porosity on the transport of dextran polysaccharides. The proposed phenomenological constitutive relations are shown to provide better fits of experimental results than prior models proposed in the literature based on the microstructure of the gel. While these constitutive models were developed for the transport of dextran in agarose hydrogels, it is expected that they may also be applied to the transport of similar molecular weight solutes in other porous media. This quantification can assist in the application of biophysical models that describe biological transport in deformable tissues, as well as the cell cytoplasm.

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Acknowledgments

This study was supported with funds from the National Institute of Arthritis and Musculoskeletal and Skin Diseases of the US National Institutes of Health (AR 46532 and AR 52871).

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  1. Department of Biomedical Engineering, Columbia University, New York, USA

    Michael B. Albro, Vikram Rajan, Roland Li, Clark T. Hung & Gerard A. Ateshian

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  1. Michael B. Albro
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  2. Vikram Rajan
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  5. Gerard A. Ateshian
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Correspondence to Michael B. Albro.

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Albro, M.B., Rajan, V., Li, R. et al. Characterization of the Concentration-Dependence of Solute Diffusivity and Partitioning in a Model Dextran–Agarose Transport System. Cel. Mol. Bioeng. 2, 295–305 (2009). https://doi.org/10.1007/s12195-009-0076-4

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