Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 13, Pages 10647-10655Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b18166
Keywords
bioactive surface; sugar-responsive; dynamic covalent bond; beta-cyclodextrin; phenylboronic acid
Funding
- National Natural Science Foundation of China [21774086, 21334004]
- National Key Research and Development Program of China [2016YFC1100402]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Smart bioactive surfaces that can modulate interactions with biological systems are of great interest. In this work, a surface with switchable bioactivity in response to sugars has been developed. It is based on dynamic covalent bonding between phenylboronic acid (PBA) and secondary hydroxyls on the wide rim of beta-cyclodextrin (beta-CD). The system reported consists of gold surface modified with PBA-containing polymer brushes and a series of functional beta-CD derivatives conjugated to diverse bioactive ligands (CD-X). CD-X molecules are attached to the surface to give specified bioactivity such as capture of a specific protein or killing of attached bacteria. Subsequent treatment with cis-diol containing biomolecules having high affinity for PBA (e.g. fructose) leads to the release of CD-X together with the captured proteins, killed bacteria, and so forth from the surface. The surface bioactivity is thereby turned off. Effectively, this constitutes an on-off bioactivity switch in a mild and noninvasive way, which has the potential in the design of dynamic bioactive surfaces for biomedical applications.
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