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Abstract
Proteins represent complex biomolecules capable of wide-ranging but also highly specific functionalities. Their immobilization on material supports can enable broad applications from sensing and industrial biocatalysis to biomedical interfaces and materials. We demonstrate the advantages of using aqueous-processed cross-linked polyphenol coatings for immobilizing proteins, including IgG, avidin, and various single and multidomain enzymes on diverse materials, to enable active biofunctional structures (e.g., ca. 2.2, 1.7, 1.1, and 4.8 mg·m–2 active phosphatase on nanoporous cellulose and alumina, steel mesh, and polyester fabric, respectively). Enzyme assays, X-ray photoelectron spectroscopy, silver staining, supplemented with contact angle, solid-state 13C NMR, HPLC, and ESI-MS measurements were used to characterize the polyphenols, coatings, and protein layers. We show that the functionalization process may be advantageously optimized directly for protein activity rather than the traditional focus on the thickness of the coating layer. Higher activities (by more than an order of magnitude in some cases) and wider process pH and material compatibility are demonstrated with polyphenol coatings than other approaches such as polydopamine. Coatings formed from different plant polyphenol extracts, even at lowered purity (and cost), were also found to be highly functional. Chemically, our results indicate that polyphenol coatings differ from polydopamine mainly because of the elimination of amine groups, and that polyphenol layers with intermediate levels of reactivity may better lead to high immobilized protein activity. Overall, an improved understanding of simple-to-use polyphenol coatings has been obtained, which enabled a significant development in active protein surfaces that may be applied across diverse materials and nanostructured supports.
Original language | English |
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Pages (from-to) | 39353-39362 |
Number of pages | 10 |
Journal | ACS Applied Materials and Interfaces |
Volume | 10 |
Issue number | 45 |
Early online date | 9 Oct 2018 |
DOIs | |
Publication status | Published - 14 Nov 2018 |
Keywords
- immobilisation
- enzymes
- proteins
- polyphenols
- tannic acid
- XPS
- alumina
- cellulose
- nanoporous materials
- surface functionalisation
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Projects
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Datasets
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Data for: "Highly active protein surfaces enabled by plant-based polyphenol coatings"
Sousa, A. (Creator), Lau, K. H. A. (Creator), Halling, P. (Contributor), Li, T. (Data Collector) & Varghese, S. (Data Collector), University of Strathclyde, 10 Dec 2018
DOI: 10.15129/dd9a0723-686f-4212-8255-e5745f10a88e
Dataset
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10th International Conference on Materials for Advanced Technologies
K. H. Aaron Lau (Invited speaker)
23 Jun 2019 → 28 Jun 2019Activity: Participating in or organising an event types › Participation in conference
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257th American Chemical Society National Meeting - Orlando
K. H. Aaron Lau (Speaker)
4 Apr 2019Activity: Participating in or organising an event types › Participation in conference
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Invited lecture at IMRE Singapore (Advanced Surfaces Lecture Series)
K. H. Aaron Lau (Invited speaker)
14 Dec 2018Activity: Talk or presentation types › Invited talk