resumo
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.
palavras-chave
DRUG-DELIVERY-SYSTEM; ELLAGIC ACID; ESSENTIAL OILS; ANTIOXIDANT PROPERTIES; IN-VITRO; ANTIBACTERIAL; NANOPARTICLES; METABOLITES
categoria
Chemistry; Food Science & Technology
autores
Vilela, C; Pinto, RJB; Coelho, J; Domingues, MRM; Daina, S; Sadocco, P; Santos, SAO; Freire, CSR
nossos autores
Carla Vilela
Investigador Auxiliar
Carmen Sofia da Rocha Freire Barros
Investigador Principal
Ricardo Pinto
Investigador
Sónia Andreia Oliveira Santos
InvestigadorGrupos
4 - biorrefinarias, materiais de origem biológica e reciclagem
5 - materiais biomédicos e biomiméticos
agradecimentos
This work was developed within the scope of the project CICECO - Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. The Portuguese Foundation for Science and Technology (FCT) is also acknowledged for the postdoctoral grants to C. Vilela (SFRH/BPD/84168/2012), R. J. B. Pinto (SFRH/BPD/89982/2012) and S. A. O. Santos (SFRH/BPD/84226/ 2012), and contract under Investigador FCT to C. S. R. Freire (IF/ 01407/2012).