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Membranes 2016, 6(4), 46; doi:10.3390/membranes6040046

Separation of Peptides with Forward Osmosis Biomimetic Membranes

1
Department of Environmental Engineering, Technical university of Denmark, Kongens Lyngby 2800, Denmark
2
Department of Chemistry and Bioscience, Aalborg University, Copenhagen 2450, Denmark
3
Department of Pharmacy, University of Copenhagen, Copenhagen 2100, Denmark
4
Department of Chemical Technology, University of Maribor, Maribor 2000, Slovenia
*
Authors to whom correspondence should be addressed.
Academic Editor: Chuyang Y. Tang
Received: 9 September 2016 / Revised: 2 November 2016 / Accepted: 10 November 2016 / Published: 15 November 2016
(This article belongs to the Special Issue Biological, Biomimetic, and Biomedical Applications of Membranes)
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Abstract

Forward osmosis (FO) membranes have gained interest in several disciplines for the rejection and concentration of various molecules. One application area for FO membranes that is becoming increasingly popular is the use of the membranes to concentrate or dilute high value compound solutions such as pharmaceuticals. It is crucial in such settings to control the transport over the membrane to avoid losses of valuable compounds, but little is known about the rejection and transport mechanisms of larger biomolecules with often flexible conformations. In this study, transport of two chemically similar peptides with molecular weight (Mw) of 375 and 692 Da across a thin film composite Aquaporin Inside™ Membrane (AIM) FO membrane was investigated. Despite the relative large size, both peptides were able to permeate the dense active layer of the AIM membrane and the transport mechanism was determined to be diffusion-based. Interestingly, the membrane permeability increased 3.65 times for the 692 Da peptide (1.39 × 10−12 m2·s−1) compared to the 375 Da peptide (0.38 × 10−12 m2·s−1). This increase thus occurs for an 85% increase in Mw but only for a 34% increase in peptide radius of gyration (Rg) as determined from molecular dynamics (MD) simulations. This suggests that Rg is a strong influencing factor for membrane permeability. Thus, an increased Rg reflects the larger peptide chains ability to sample a larger conformational space when interacting with the nanostructured active layer increasing the likelihood for permeation. View Full-Text
Keywords: forward osmosis; biomimetic; peptides; rejection forward osmosis; biomimetic; peptides; rejection
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bajraktari, N.; Madsen, H.T.; Gruber, M.F.; Truelsen, S.; Jensen, E.L.; Jensen, H.; Hélix-Nielsen, C. Separation of Peptides with Forward Osmosis Biomimetic Membranes. Membranes 2016, 6, 46.

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