Journal
ULTRASONICS SONOCHEMISTRY
Volume 51, Issue -, Pages 386-394Publisher
ELSEVIER
DOI: 10.1016/j.ultsonch.2018.07.043
Keywords
Ultrasonic processing; Polyvinyl alcohol; Tea polyphenol; Composite film
Categories
Funding
- National Natural Science Foundation of China, China [51703147]
- Sichuan Science and Technology Program [2018RZ0034]
- Natural Science Fund of Education Department of Sichuan Province [16ZB0044, 035Z1373]
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In this study, polyvinyl alcohol (PVA) was used as a film-forming substrate, added to extracted tea polyphenols (TPs) in various ratios and processed with ultrasonication to form films using the tape-casting method. The effects of ultrasonic processing duration on the properties of PVA/TP antibacterial active materials were explored via material property testing. The results showed that, overall, ultrasonic processing degraded the tensile strength and elongation at break of the composite films. When PVA/TP composite films with a PVA-to-TP mass ratio of 8:2 were processed with ultrasonication for 30 min, the swelling capacity was (740.19 +/- 64.67)% and solubility was (5.26 +/- 1.31)%. Ultrasonication also improved the degradability and barrier properties of composite films. Moreover, 8/2 composite films with the PVA/TP ratio of 8:2 exhibited excellent bacteriostatic properties; after ultrasonication processing, the films had a bacteriostatic rate of (95.5 +/- 4.2)% and (91.8 +/- 3.7)% against Staphylococcus aureus and Escherichia coli, respectively, making them suitable for use as antibacterial active materials in food packaging.
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