Gelatin-sodium alginate based films with Pseuderanthemum palatiferum (Nees) Radlk. freeze-dried powder obtained by subcritical water extraction

Publication date: June 2020Source: Food Packaging and Shelf Life, Volume 24Author(s): Truc Cong Ho, Myoung Hwan Kim, Yeon-Jin Cho, Jin-Seok Park, Seung Yun Nam, Byung-Soo ChunAbstractIn the present study, gelatin-sodium alginate (GSA) based films were integrated with Pseuderanthemum palatiferum (Nees) Radlk. freeze-dried powder (PFP) obtained by subcritical water extraction. The influences of PFP at different concentrations on physical properties and antioxidant activity of GSA based films were investigated. Total phenolic content, antioxidant activity increased with the increase in PFP concentrations. Moisture content (MC) of films was not significantly different, water vapor permeability (WVP) decreased, while water solubility (WS) increased with the growth of PFP concentrations. Regarding mechanical properties, tensile strength (Ts) of GSA based films was improved; however, elongation at break (EAB) decreased when the content of PFP in film-forming solutions increased. GSA based films exhibited good microstructure, thermal resistance, and interaction between gelatin and phenolic compounds. From the obtained results, composite GSA based films blended with PFP can be potentially applied in the food packing to extend food shelf life.Graphical abstract
Source: Food Packaging and Shelf Life - Category: Food Science Source Type: research