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

Pérez-Córdoba L.J.; Sánchez-Pizarro A.; Vélez-Erazo E.M.; Peña-Carrasco E.F.; Pasquel-Reátegui J.L.; Martínez-Tapia P.; Velezmoro-Sánchez C. · Journal of Applied Polymer Science (2024) · DOI: 10.1002/app.55243

Resumen

Films 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.

Instituciones: Universidad Nacional Agraria La Molina; Universidad Nacional de San Martín