Active Biodegradable Polyvinyl Alcohol–Hemicellulose/Tea Polyphenol Films with Excellent Moisture Resistance Prepared via Ultrasound Assistance for Food Packaging

Abstract

Poor water-vapor barriers and mechanical properties are common problems of biobased films. To maintain food quality, the barrier and its strength performance need to be improved. Tea polyphenols (TP) are a natural active substance, and their benzene ring structure provides a barrier for them as a film material. Films that incorporate TP also have enriched functionalities, e.g., as antioxidants. Here, active poly (vinyl alcohol) (PVA)-hemicellulose (HC)/TP films with good moisture resistance and antioxidant capacity were prepared via ultrasound assistance. The effects of TP incorporation and ultrasonication on the physical, antioxidant, and micromorphological properties of the films were investigated. Results showed that the addition of TP improved the thermal stability and water-vapor permeability (WVP) of the composite films. When a PVA-HC/TP composite film with a PVA-HC to TP mass ratio of 100:10 was treated with ultrasonication for 45 min, tensile strength was 25.61 Mpa, which was increased by 54% from the film without any treatment, and water-vapor permeability (WVP) value declined from 49% to 4.29 × 10−12 g·cm/cm2·s·Pa. More importantly, the films’ DPPH scavenging activity increased to the maximal levels of 85.45%. In short, these observations create a feasible strategy for preparing high-performance biodegradable active-packaging films.

Structural, antioxidant, antibacterial and biodegradation properties of rice straw xylan (native and modified) based biofilms

“…Free radical scavenging activity of biofilms was analysed with the help of 2, 2‐diphenyl‐1‐picrylhydrazyl assay (Wang et al ., 2021). Firstly, 25 mg of samples were dissolved in distilled water (3 mL).…”

Oxygen Barrier Performance of Poly(vinyl alcohol) Coating Films with Different Induced Crystallinity and Model Predictions

“…In addition, PVOH's low oxygen permeability, adhesive qualities, and effectiveness in film-forming are attractive properties for dispersion barrier coating applications. Moreover, PVOH is a recyclable, odour barrier, and food contact compliant, appropriate for active and antibacterial packaging [4,5], dry, and bulk food packaging applications [6,7]. The gas barrier property of PVOH is partially attributed to the crystalline regions/phases within its Coatings 2021, 11, 1253 2 of 12 matrix.…”