Vol. 23, No. 3 (2024), Alim24326 https://doi.org/10.24275/rmiq/Alim24326

Biodegradable films based on tilapia collagen (Oreochromis sp): improvement of properties with PLA and PCL bilayers with potential use in sustainable food packaging

 

Authors

A.M. Muñoz-Suarez, M. Cortés-Rodríguez, R. Ortega-Toro

Abstract

The study aimed to develop biodegradable films from collagen (Col) obtained from tilapia by-products (Oreochromis Sp) in combination with polylactic acid (PLA) and polycaprolactone (PCL). For collagen extraction, 0.1 N NaOH was used in a solid-liquid ratio of 1:20 (w/v), the fat was removed from the tilapia skin using 10% butyl alcohol, and for the scale’s decalcification with 0.5 M EDTA. The yield of the collagen obtained in both by-products was determined and characterized by the UV-VIS and FTIR (Fourier transform infrared spectroscopy) spectra compared to commercial collagen. As a result, there was a notable reduction in water content of less than 20%, and F3+PLA obtained a lower solubility percentage than the other bilayers. Regarding the contact angle, the bilayers obtained values greater than 100°. In mechanical tests, PCL presented the highest percentage of elongation at the point of break, which was 1067%, which could be related to greater flexibility and stretchability before breakage. The permeability values in the bilayers decreased significantly; F2+PLA indicated better control in the film as a barrier against water vapor, 0.55 g-mm/kPa-h-m2. Therefore, mixing a hydrophilic and a hydrophobic layer could improve the characteristics, providing higher stability and obtaining films with optimal properties to produce food packaging.

Keywords

Eco-friendly packaging, Tilapia by-products, Collagen extraction, Bilayers.

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