Effects of addition of condensed tannin on the structure and properties of silk fibroin film |
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| Authors: | Mingbo Ma Suozhuai Dong Munir Hussain Wenlong Zhou |
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| Affiliation: | 1. Key Laboratory of Advanced Textile Materials and Manufacturing Technology (Ministry of Education), College of Materials and Textiles, Zhejiang Sci‐Tech University, Hangzhou, Zhejiang, China;2. Silk Inspection Center, Zhejiang Entry‐Exit Inspection and Quarantine Bureau, Hangzhou, Zhejiang, China |
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| Abstract: | Condensed tannin is a polymeric polyphenol compound, which has considerable protein‐binding ability and a variety of bioactivities, such as anti‐inflammatory, antithrombotic and antimicrobial activities. In this study, silk fibroin film was modified by adding condensed tannin. It was found that strong intermolecular interactions occurred between silk fibroin and tannin, and incorporation of 1–10% (w/w) tannin in the blend films resulted in more compact, stiffer but less elastic films. Swelling and dissolution trials showed that the addition of tannin significantly reduced the swelling and solubility of the films. The mechanical properties, swelling and solubility of the blend films varied as a function of tannin concentration, showing optimum values when containing 10% (w/w) tannin. The silk fibroin–tannin films all showed significant antioxidant activity and antibacterial activity against Gram‐positive bacteria, and the activities were positively related to the concentration of tannin. The results emphasized that the addition of condensed tannin could simultaneously improve the structural stability of silk fibroin film and impart functional properties. © 2016 Society of Chemical Industry |
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| Keywords: | silk fibroin condensed tannin protein– polyphenol interaction antioxidant antibacterial activity |
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