A Natural Antibacterial-Antioxidant Film from Soy Protein Isolate Incorporated with Cortex Phellodendron Extract

Abstract

An active film was prepared by incorporating cortex Phellodendron extract (CPE, an active agent) into a soybean protein isolate (SPI). Different concentrations of CPE (0%, 10%, 12.5%, 15%, 17.5%, 20%, or 22.5%, w/w, based on SPI) were mixed into the films characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, thermogravimetry, tensile tests, and barrier properties. The rheological properties of the solutions were also tested. The effects of the CPE content on the antibacterial and antioxidant activities of the films were examined. The results indicated that new hydrogen bonds formed between molecules in the films, and the crystallinity of the films decreased. The incorporation of CPE had no significant influence on the thermal stability of the films. Films containing 15% CPE had the maximum tensile strength of 6.00 MPa. The barrier properties against water vapor, oxygen, and light enhanced with the incorporation of CPE. The antioxidant activity of the SPI film was also improved. The films were effective against Staphylococcus aureus (S. aureus, Gram-positive bacteria). These results suggest that the SPI/CPE film can potentially extend the shelf lives of foods.

Fabrication of Functional Bioelastomer for Food Packaging from Aronia (Aronia melanocarpa) Juice Processing By-Products

“…The presence of bacteria such as S. aureus and E. coli in food causes food spoilage, food-borne diseases, reduced shelf life, and economic loss [51]. Growth inhibition of these bacteria is considered an indicator of food safety [52]. Figure 5 demonstrates the antibacterial activity of the bioelastomers using agar plates for S. aureus and E. coli.…”

Recent Developments in the Reduction of Oxidative Stress through Antioxidant Polymeric Formulations

“…The hydrofilm was tested by ex vivo assay in human skin showing to be biocompatible and allowing the healing process. Liang and Wang incorporated into a soybean protein isolate different concentrations of cortex Phellodendron extract (CPE) obtaining an active film with good rheological properties, but additional antioxidant and antimicrobial properties against Staphylococcus aureus bacteria (the best compromise being 15% CPE w/w ), which is potentially useful for improving food products’ shelf life [64].…”

Application of a Natural Antioxidant from Grape Pomace Extract in the Development of Bioactive Jute Fibers for Food Packaging

“…However, the applicability of RGPE go beyond their direct addition in food formulation and it has been also investigated in material engineering. Besides its use as a natural dyeing colorant for wood, silk, cotton, polyamide or acrylic fabrics [ 9 , 10 , 11 ], anthocyanins and proanthocyanidins from red grape and other sources have been recently used as pH-sensitive compounds in intelligent packaging and as an active substance in active film-packaging formulation [ 12 , 13 , 14 , 15 ]. For example, Kurek et al evaluated the antioxidant properties of chitosan and carboxymethyl cellulose films enriched with blueberry and red grape pomace extracts [ 16 ].…”