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Materials 2016, 9(9), 757; doi:10.3390/ma9090757

Electrospun Polymer Nanofibers Reinforced by Tannic Acid/Fe+++ Complexes

1
Department of Agriculture, Dairy and Functional Foods Research Unit, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, PA 19038, USA
2
Key Laboratory of Food Nutrition and Safety (Ministry of Education), Tianjin University of Science and Technology, Tianjin 300072, China
Mention of trade names or commercial products in this article is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture.
*
Author to whom correspondence should be addressed.
Academic Editor: Nicole Zander
Received: 8 June 2016 / Revised: 29 August 2016 / Accepted: 30 August 2016 / Published: 6 September 2016
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Abstract

We report the successful preparation of reinforced electrospun nanofibers and fibrous mats of polyvinyl alcohol (PVA) via a simple and inexpensive method using stable tannic acid (TA) and ferric ion (Fe+++) assemblies formed by solution mixing and pH adjustment. Changes in solution pH change the number of TA galloyl groups attached to the Fe+++ from one (pH < 2) to two (3 < pH < 6) to three (pH < 7.4) and affect the interactions between PVA and TA. At pH ~ 5.5, the morphology and fiber diameter size (FDS) examined by SEM are determinant for the mechanical properties of the fibrous mats and depend on the PVA content. At an optimal 8 wt % concentration, PVA becomes fully entangled and forms uniform nanofibers with smaller FDS (p < 0.05) and improved mechanical properties when compared to mats of PVA alone and of PVA with TA (p < 0.05). Changes in solution pH lead to beads formation, more irregular FDS and poorer mechanical properties (p < 0.05). The Fe+++ inclusion does not alter the oxidation activity of TA (p > 0.05) suggesting the potential of TA-Fe+++ assemblies to reinforce polymer nanofibers with high functionality for use in diverse applications including food, biomedical and pharmaceutical. View Full-Text
Keywords: complexation; polyphenol; antioxidant; mechanical reinforcement; electrospinning complexation; polyphenol; antioxidant; mechanical reinforcement; electrospinning
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yang, W.; Sousa, A.M.M.; Thomas-Gahring, A.; Fan, X.; Jin, T.; Li, X.; Tomasula, P.M.; Liu, L. Electrospun Polymer Nanofibers Reinforced by Tannic Acid/Fe+++ Complexes
. Materials 2016, 9, 757.

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