Physicochemical and antioxidant properties of gelatin-based films containing oily tomato extract (Solanum lycopersicum L.)

Abstract

The aim of this work was to evaluate the effects of oily tomato extract (OTE) at concentrations of 0, 1, 3 and 5% on the physicochemical and antioxidant properties of gelatin-based films. Characterization of the extract showed lycopene and β-carotene concentrations of 159.15 and 20.38 μg/mL, respectively. The results showed that the addition of OTE was associated with a decrease in moisture content, a lower solubility, a lower water vapor permeability, and a lower Young’s modulus, while the elongation percentage showed a significant increase. The addition of OTE improved the barrier properties of the films against UV and visible light. The higher the OTE concentration was, the greater the amounts of lycopene and β-carotene within the films, and therefore, the higher the antioxidant activity was (2.49 μM Trolox equivalents per g of film). The results suggest that the addition of OTE to gelatin-based films can improve their mechanical properties and increase their antioxidant capacity.

Keywords

• oily tomato extract
• mechanical properties
• water vapor permeability
• uv-light protection
• antioxidant activity