Volume 53, Issue 46 pp. 12600-12604
Communication

Formation of Polydopamine Nanofibers with the Aid of Folic Acid

Xiang Yu

Xiang Yu

Department of Chemistry, Renmin University of China, Beijing 100872 (P. R. China)

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Hailong Fan

Hailong Fan

Department of Chemistry, Renmin University of China, Beijing 100872 (P. R. China)

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Le Wang

Le Wang

Department of Chemistry, Renmin University of China, Beijing 100872 (P. R. China)

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Prof. Dr. Zhaoxia Jin

Corresponding Author

Prof. Dr. Zhaoxia Jin

Department of Chemistry, Renmin University of China, Beijing 100872 (P. R. China)

Department of Chemistry, Renmin University of China, Beijing 100872 (P. R. China)Search for more papers by this author
First published: 21 August 2014
Citations: 105

We gratefully acknowledge the National Natural Science Foundation of China (grants 21374132 and 51173201) for financial support. We thank Z. X. Nie and H. H. Liu at the Institute of Chemistry, Chinese Academy of Science, for MALDI-TOF characterization.

Graphical Abstract

The magic of folic acid: When the oxidative self-polymerization of dopamine (turquoise) was conducted in the presence of folic acid (yellow), novel aggregated nanostructures of polydopamine (PDA) were generated: nanobelts and nanofibers (see SEM image). Supramolecular interactions between folic acid and protomolecules of PDA, such as π–π interactions and hydrogen bonding, appear to contribute to the formation of the nanobelts and nanofibers.

Abstract

Polydopamine (PDA) generated by the oxidative self-polymerization of dopamine shows great potential for surface modification. Observed PDA nanostructures are nanoparticles and thin films. The formation mechanism of PDA is still unclear; thus, the manipulation of PDA nanostructures is a big challenge. In this study, we first demonstrated that folic acid shows a dramatic effect on the PDA nanostructure: New aggregated nanostructures of PDA, nanobelts and nanofibers, were generated in a dopamine/folic acid system. We hypothesized that folic acid may be involved in the stacking of protomolecules of PDA by π–π interactions and hydrogen bonding. Herein we describe the first experimental strategy to manipulate the aggregation of PDA by using small molecules. This study not only provides a new method for generating PDA nanofibers, which are proposed bioorganic electronic materials, but also a possible way to understand the formation mechanism of PDA and its analogues in nature, melanins.

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