Bitter potato starch‐based film enriched with copaiba leaf extract obtained using supercritical carbon dioxide: Physical–mechanical, antioxidant, and disintegrability properties

Abstract

AbstractFilms based on bitter potato starch (BPS) and its blends with chitosan (BPS‐Ch) or soy protein isolate (BPS‐SPI) loaded with copaiba leaf extract (E) are prepared via the casting method. The physical–mechanical and antioxidant properties of the as‐prepared films are compared with those of a control. Moreover, the half‐maximal degradation (t50) of the prepared films is calculated by fitting the Hill model to disintegrability kinetic data. Among the analyzed films, BPS‐Ch‐E exhibits the lowest (p < 0.05) solubility in water and opacity, strongest water vapor‐barrier (3.58 × 10−11 g m−1 s−1 Pa−1), and highest tensile strength and elongation at break. The Fourier transform infrared spectra of BPS‐Ch‐E and BPS‐SPI‐E demonstrate new peaks at 1550, 1239, and 1070 cm−1 corresponding to NH and CO stretching. The BPS‐E and BPS‐Ch‐E surfaces are devoid of scratches and phase separation. The incorporation of E significantly increases the antioxidant activity of the films. BPS‐SPI‐E and BPS‐Ch‐E demonstrate the lowest (t50 ≈ 1.4 days) and highest (t50 ≈ 3.5 days) disintegration rates, respectively, among the prepared films. E loading facilitates the development of films possessing beneficial physical–mechanical and antioxidant properties as well as rapid disintegrability, enabling their potential application as a eco‐friendly packaging material.