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Probing structure–antifouling activity relationships of polyacrylamides and polyacrylates

Paper ID Volume ID Publish Year Pages File Format Full-Text
6525 499 2013 11 PDF Available
Title
Probing structure–antifouling activity relationships of polyacrylamides and polyacrylates
Abstract

We have synthesized two different polyacrylamide polymers with amide groups (polySBAA and polyHEAA) and two corresponding polyacrylate polymers without amide groups (polySBMA and polyHEA), with particular attention to the evaluation of the effect of amide group on the hydration and antifouling ability of these systems using both computational and experimental approaches. The influence of polymer architectures of brushes, hydrogels, and nanogels, prepared by different polymerization methods, on antifouling performance is also studied. SPR and ELISA data reveal that all polymers exhibit excellent antifouling ability to repel proteins from undiluted human blood serum/plasma, and such antifouling ability can be further enhanced by presenting amide groups in polySBAA and polyHEAA as compared to polySBMA and polyHEA. The antifouling performance is positively correlated with the hydration properties. Simulations confirm that four polymers indeed have different hydration characteristics, while all presenting a strong hydration overall. Integration of amide group with pendant hydroxyl or sulfobetaine group in polymer backbones is found to increase their surface hydration of polymer chains and thus to improve their antifouling ability. Importantly, we present a proof-of-concept experiment to synthesize polySBAA nanogels, which show a switchable property between antifouling and pH-responsive functions driven by acid–base conditions, while still maintaining high stability in undiluted fetal bovine serum and minimal toxicity to cultured cells. This work provides important structural insights into how very subtle structural changes in polymers can yield great improvement in biological activity, specifically the inclusion of amide group in polymer backbone/sidechain enables to obtain antifouling materials with better performance for biomedical applications.

Keywords
Antifouling materials; Polyacrylamide; Polyacrylate; Protein adsorption; Cell adhesion; Stimuli-responsive materials
First Page Preview
Probing structure–antifouling activity relationships of polyacrylamides and polyacrylates
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 34, Issue 20, July 2013, Pages 4714–4724
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering