Abstract
The development of low fouling membranes to minimize protein adsorption has relevance in various biomedical applications. Here, electrically neutral peptoids containing 2-methoxyethyl glycine (NMEG) side chains were attached to polysulfone hollow fiber membranes via polydopamine. The number of side chains and grafting density were varied to determine the effect on coating properties and the ability to prevent fouling. NMEG peptoid coatings have high hydrophilicity compared to unmodified polysulfone membranes. The extent of biofouling was evaluated using bovine serum albumin, as well as platelet adhesion. The results suggest that both the number of side chains and grafting density play a role in the surface properties that drive biofouling. Protein adsorption decreased with increasing peptoid grafting density and is lowest above a critical grafting density specific to peptoid chain length. Our findings show that the optimization of grafting density and hydration of the surface are important factors for achieving the desired antifouling performance.
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Acknowledgments
The authors would like to thank Dr. Min Zou for assistance with contact angle measurements, Dr. Timothy Muldoon for assistance with fluorescence imaging, the Arkansas Statewide Mass Spectrometry Facility for assistance with MALDI, and the Arkansas Nano & Bio Materials Characterization Facility for assistance with SEM. The authors also acknowledge Nanostone (Oceanside, CA) for providing PSU pellets. The authors thank Dr. Philip Turner, Dr. Dmytro Demydov, Dr. Helya Najafi, Dr. German Raul Perez Bakovic, Dr. Kevin Roberts, John Moore, Lauren Reed, and Dr. Tammy Lutz-Rechtin for assistance in the laboratory and Peggy Anderson for assistance with the manuscript.
Funding
Support has been provided in part by the Arkansas Biosciences Institute, the major research component of the Arkansas Tobacco Settlement Proceeds Act of 2000, and the Center for Advanced Surface Engineering (CASE), under the National Science Foundation (NSF) Grant No. OIA-1457888 and the Arkansas EPSCoR Program.
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Mahmoudi, N., Roberts, J., Harrison, G. et al. Low Fouling, Peptoid-Coated Polysulfone Hollow Fiber Membranes—the Effect of Grafting Density and Number of Side Chains. Appl Biochem Biotechnol 191, 824–837 (2020). https://doi.org/10.1007/s12010-019-03218-4
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DOI: https://doi.org/10.1007/s12010-019-03218-4