Journal
FOOD HYDROCOLLOIDS
Volume 73, Issue -, Pages 120-128Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2017.06.037
Keywords
Active packaging; Antioxidant activity; Antimicrobial activity; Chitosan; Ellagic acid; UV protection
Categories
Funding
- FCT/MEC
- FEDER
- Portuguese Foundation for Science and Technology (FCT) [SFRH/BPD/84168/2012, SFRH/BPD/89982/2012, SFRH/BPD/84226/ 2012]
- FCT [IF/01407/2012]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/84226/2012] Funding Source: FCT
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Homogeneous, translucent and flexible films of chitosan (CH) and ellagic acid (EA) were prepared by solvent casting. Various concentrations of EA (0.5, 1.0, 2.5 and 5.0% w/w relative to CH) were used in order to evaluate their UV-blocking properties. In addition, the photochemical stability of the films was also studied via artificial solar light irradiation. These set of films display high mechanical properties (Young's modulus = 3.21e3.57 GPa), thermal stability up to 215e220 degrees C, UVA-and UVB-barrier properties, moderate water vapor permeability (WVP = 2.82e3.70 g mm m(-2) day(-1) kPa(-1)) and maximum antioxidant activity around 28% (DPPH scavenging activity). Furthermore, all CH/EA films show antimicrobial activity against food-borne pathogens such as Gram-positive (Staphylococcus aureus) and Gram-negative (Pseudomonas aeruginosa) bacteria due to the CH antimicrobial effectiveness. These bioactive UV-blocking CH/EA films open the way to materials with potential for eco-friendly active packaging. (C) 2017 Elsevier Ltd. All rights reserved.
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