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Effect of tannic acid as crosslinking agent on fish skin gelatin-silver nanocomposite film

2018; Elsevier BV; Volume: 19; Linguagem: Inglês

10.1016/j.fpsl.2018.11.005

2214-2894

Maria do Livramento Linhares Rodrigues Menezes, Natália da Rocha Pires, Pablyana Leila Rodrigues da Cunha, Morsyleide de Freitas Rosa, Bartolomeu Warlene Silva de Souza, Judith Pessoa de Andrade Feitosa, Mén de Sá Moreira de Souza Filho,

Collagen: Extraction and Characterization

Gelatin was obtained from the Nile tilapia skin and used to prepare and stabilize silver nanoparticles (AgNPs) at a pH of 11.0. The properties gelatin-AgNP and gelatin-AgNP films with tannic acid (TA) were evaluated. TA is a non-toxic cross-linker agent and was add to enhance the mechanical properties of the gelatin-AgNPs nanocomposite. The films were studied by UV–vis and infrared (FT-IR) spectroscopy, thermal gravimetric analysis (TGA), mechanical analysis (tensile strength and elongation at break), water vapor permeability, solubility, scanning electron microscopy and antimicrobial activities (tested against two pathogens: S. aureus (gram-positive) and E. coli (gram-negative)). The gelatin films containing 5.0 wt% of TA, 0.2 wt% of AgNPs and 20 wt% of glycerol exhibited high mechanical strength, low water barrier, and antimicrobial activity against both pathogens. The presence of TA in gelatin-AgNPs nanocomposite was essential to promote these properties. Therefore, films with TA presented greater possibility to be used as food packaging.