Bio-based films prepared with soybean by-products and pine (Pinus densiflora) bark extract. (20th June 2018)

• Record Type: Journal Article
• Authors: Han, Yingying; Yu, Miao; Wang, Lijuan
• Is Part Of: Journal of cleaner production. Volume 187(2018)
• Page Start: 1
• Page End: 8
• Publication Date: 2018-06-20
• Subjects: Pine bark extract -- Soybean by-product -- Physical property -- Antioxidant activity; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2018.03.115
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: The increasing awareness of environmental protection associated to plastic waste has promoted the developments of biopackaging in food industry. Pine ( Pinus densiflora ) bark extract (PBE) obtained from waste dry bark from lumber processing is a good source of oligomeric procyanidins and has excellent antioxidant activity. In this study, bio-based antioxidant films were prepared by incorporating different concentrations of PBE (0 20, 50, and 80 g kg −1 ) into soy protein isolate (SPI) matrix and analyzed in terms of structure, as well as physical, mechanical, and antioxidant properties. Scanning electron microscopy results suggested that the structures of the films with PBE were rougher. X-ray diffraction analysis indicated cross-linking interactions formed between the phenolic hydroxyl group in PBE and the amino groups in the SPI matrix. Thermogravimetric analysis indicated that PBE enhanced the thermal stability of the films. Moreover, the addition of 50 g kg −1 PBE decreased the moisture content, water vapor permeability, and oxygen permeability of the SPI films by 30.7%, 9.1%, and 31.6%, respectively. The PBE-containing films exhibited good light-barrier property. They also exhibited high tensile strength and low elongation at break. Furthermore, PBE markedly increased the antioxidant activity of the SPI films. Antioxidant SPI films with PBE have potential application in food packaging. Highlights: The prepared films showed significant antioxidant activity. PBE incorporated into the films improved their water and oxygen barrier properties. PBE also enhanced the thermal stability of the films.