Department of Food, Nutrition and Packaging Sciences, Clemson University, Clemson 29634, USA.
Guru Jambheshwar University of Science &Technology, Hisar 125001, Haryana, India.
Int J Biol Macromol. 2023 Feb 1;227:762-776. doi: 10.1016/j.ijbiomac.2022.12.199. Epub 2022 Dec 21.
Wheat straw (WS) is one of the abundant categories of agricultural waste, which is usually abandoned and burned yearly, thus creating environmental issues. Traditionally, it is used for low-value purposes, mainly in cattle feeding or agricultural mulch, and the rest is burnt or thrown away. WS is a valuable candidate as raw material for being used as reinforcing fibers to fabricate biocomposites. Among existing strategies, one of the potential strategies to utilize such lignocellulosic biomasses includes the extraction of cellulose as a potential candidate in the fabrication of sustainable packaging. Exploring WS as a valuable source of cellulose could be a key strategy for enabling biopolymers in packaging, which relies on developing tailor-made materials from non-food and low-cost resources. In this regard, the valorization of WSs for packaging can add value to these underutilized residues and successfully contribute to the circular economy concept. The review addresses the valorization of WS as a source of cellulose and its nanostructured forms for food packaging applications. The review also discusses cellulose derivatives extraction using conventional or innovative techniques (microwave-assisted extraction, fractionation, mechanical fibrillation, steam-explosion, microfludization, enzymatic hydrolysis, etc.). The different applications of these extracted biopolymers in the packaging are also summarized.
麦草(WS)是农业废弃物的主要类别之一,通常每年都会被废弃和焚烧,从而造成环境问题。传统上,它主要用于低价值的用途,如牛饲料或农业覆盖物,其余的则被焚烧或丢弃。WS 是一种很有价值的原料,可以作为增强纤维来制造生物复合材料。在现有的策略中,利用这种木质纤维素生物质的潜在策略之一包括提取纤维素,作为制造可持续包装的潜在候选材料。探索 WS 作为纤维素的有价值来源可能是在包装中使用生物聚合物的关键策略,这依赖于开发定制的材料,这些材料来自非食品和低成本的资源。在这方面,将 WS 作为包装材料的增值利用可以为这些未充分利用的废物增加价值,并成功为循环经济理念做出贡献。本文综述了 WS 作为纤维素及其纳米结构形式在食品包装应用中的增值利用。本文还讨论了使用传统或创新技术(微波辅助提取、分级、机械纤维化、蒸汽爆破、微流化、酶水解等)提取纤维素衍生物。总结了这些提取的生物聚合物在包装中的不同应用。