Assessing of Biowaste Whey Protein as Films for Biodegradable Electronics and Packaging Applications

Carmen R Tubio*, Ander Garcia, Xabier Valle, Miriam Pinto, Susana Virgel, Josu Martinez-Perdiguero, Joana Moreira and Senentxu Lanceros-Mendez, 
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Abstract

Conversion and utilization of biowaste from the agriculture sector into useful value-added products have been of increasing interest in recent years. Special emphasis has been placed on the use of biowaste whey protein (WP) in packaging applications. In this study, WP from cheese production waste was investigated as potential material for developing films in combination with a synthetic water-soluble biopolymer poly(vinyl alcohol) (PVA) at WP contents ranging from 25 to 50 wt %. Morphology, structure, surface contact angle, and mechanical characteristics were evaluated to assess the relationship between blend composition and materials properties. WP content plays a significant role in determining the morphology of the films, with a high WP content leading to a less compact film. It leads to strong variations in the mechanical properties. The results of the electrical properties demonstrated that the electrical conductivity increases from 1.77 × 10–11 S/cm for neat PVA to 2.06 × 10–10 S/cm for the sample with 50 wt % WP, which is accompanied by variations in dielectric constant from 19.5 to 38 at 1 Hz, respectively. In addition, the presence of WP results in a low antibacterial activity, with the maximum bacterial growth inhibition for Staphylococcus aureus (22.2%) and Escherichia coli (11.5%) being obtained for PVA neat films. Finally, the degradation test revealed that after 146 days PVA neat reached 100% degradation in soil, while the sample with 50 wt % WP was only 47% degraded. Overall, the findings of this study contribute to advance toward the development of polymer blends from biowaste with tailorable characteristics for biodegradable electronic and packaging applications.

Abstract Image

评估生物废弃物乳清蛋白作为薄膜在可生物降解电子产品和包装中的应用
近年来,将农业部门产生的生物废料转化和利用为有用的增值产品越来越受到关注。生物废料乳清蛋白(WP)在包装中的应用受到了特别关注。在这项研究中,研究人员将奶酪生产废料中的乳清蛋白与合成水溶性生物聚合物聚乙烯醇(PVA)结合起来,在乳清蛋白含量为 25 至 50 wt % 的情况下,将其作为开发薄膜的潜在材料。对形态、结构、表面接触角和机械特性进行了评估,以评估混合成分与材料特性之间的关系。可湿性粉末含量在决定薄膜形态方面起着重要作用,可湿性粉末含量越高,薄膜的致密性越差。可湿性粉末的含量越高,薄膜的致密性越差,从而导致机械性能的强烈变化。电学特性结果表明,导电率从纯 PVA 的 1.77 × 10-11 S/cm 上升到含有 50 wt % WP 的样品的 2.06 × 10-10 S/cm,同时介电常数在 1 Hz 时分别从 19.5 到 38 变化。此外,可湿性粉剂的存在导致抗菌活性较低,对金黄色葡萄球菌(22.2%)和大肠杆菌(11.5%)的最大细菌生长抑制是在纯 PVA 薄膜中获得的。最后,降解测试表明,146 天后,纯 PVA 在土壤中的降解率达到 100%,而含有 50 wt % WP 的样品降解率仅为 47%。总之,这项研究的结果有助于从生物废弃物中开发出具有可定制特性的聚合物混合物,用于可生物降解的电子和包装应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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