Effect of UV-B radiation and liquid smoke on Physicochemical characterization of Salvia macrosiphon gum based edible films

Abstract

Abstract In this study, the impacts of UV-B radiation and liquid smoke (LS) on the barrier, physicochemical, thermal, and mechanical characteristics of Salvia macrosiphon seed gum (SSG) based edible films were evaluated. LS enabled a considerable rise in the SSG film thickness in comparison with the control, so the impact of raising UV-B irradiation was insignificant. Incorporating LS into film composition also influenced the films' colors, lowering the L* values. Solubility was reduced when LS was integrated into film composition. Furthermore, utilizing UV-B treatment declined the SSG film's solubility and water vapor permeability. The addition of LS raised the SSG films' tensile strength (TS). The SSG films' elongation at break declined in an LS-level manner. Further, UV-B treatment increased TS. Results of FTIR showed LS and UV-B radiation could produce new connections between the starch chains. UV-B-irradiation induced the polymer chain to dissociate. The control film possessed an uneven and coarse surface and lower thermal stability. However, the unevenness was reduced with the LS and UV-B radiation. The finding suggest the UV-B radiation and LS could be considered a sustainable, convenient, and accessible method for altering the properties of SSG-based films.