Effects of the addition of ultrasound‐pulsed gelatin to chitosan on physicochemical and antioxidant properties of casting films

Abstract

This study investigated the performance of chitosan based films with added, high‐intensity ultrasound‐pulsed, gelatins (42, 52, 71 and 84 W cm−2). The mechanical, structural, chemical and antioxidant properties were investigated, to evaluate the potential of ultrasound as a technique to improve film properties. The tensile strength and elastic modulus of films containing ultrasound‐pulsed gelatins showed a significant increase, while the elongation parameter showed a significant decrease. Micrographs showed that all films presented agglomerations. The infrared spectra of the films displayed characteristic shifts in the chitosan and gelatin spectra, which may be the result of hydrogen bridge interactions and electrostatic interactions between the two polymers. The antioxidant capacity was analyzed through the ferric reducing antioxidant power (FRAP) assay and the 2,2′‐azino‐bis(3‐ethylbenzthiazoline‐6‐sulfonic acid) (ABTS) assay of films and showed that gelatins treated with higher acoustic intensity had improved antioxidant capacity. High‐intensity ultrasound‐treated gelatin enhanced the strength, elasticity and antioxidant properties of the chitosan based films. © 2020 Society of Chemical Industry

Ultrasound-assisted preparation of chitosan/nano-silica aerogel/tea polyphenol biodegradable films: Physical and functional properties

“…This may be because more TP particles are protected by the three-dimensional network structure composed of CS and nSA after ultrasonic treatment [45] . Cuevas-acuna et al [46] also found that short time and high amplitude high-intensity ultrasonication treatment could improve the free radical scavenging ability of chitosan-gelatin film. Here, the high DPPH free radical scavenging activity was mainly based on the synergistic effect of TP and CS.…”

Improved Antioxidant and Mechanical Properties of Food Packaging Films Based on Chitosan/Deep Eutectic Solvent, Containing Açaí-Filled Microcapsules

“…When taking the F0/0 film as control, the films F5/0.5, F5/1, F5/2, F5/5 and F5/10 were statistically different ( p < 0.05 by Dunnett’s test). Cuevas-Acuña et al [ 63 ] studied the antioxidant properties of chitosan–gelatin composite films by FRAP and found values ranging from ~300 to 600 µmol TE mg −1 of film. In another study, conjugated chitosan grafted with stearic acid and gallic acid exhibited an antioxidant activity by FRAP assay, expressed as IC50, ranging from ~141 to 367 µg mL −1 [ 64 ].…”

“…The açaí oil had an antioxidant capacity against the ABTS radical around 120.21 ± 2.77 mg TE g −1 , as shown in Figure 10 . Cuevas-Acuña et al [ 63 ] studied the antioxidant properties of chitosan–gelatin composite films by ABTS radical scavenging assay and found values ranging from ~200 to 900 µmol TE mg −1 of film. In another work, CS films incorporated with mango leaf extract presented an antioxidant capacity by ABTS radical scavenging assay ranging from ~2 to 8 µg GAE g −1 film [ 65 ].…”