Abstract：
As the most abundant and renewable natural resource, cellulose has attracted significant attention and research interest for the production of hydrogels (HGs). To address environmental issues and emerging demands, the benefits of naturally produced HGs include excellent mechanical properties and superior biocompatibility. HGs are three-dimensional networks created by chemical or physical cross-linking of linear or branched hydrophilic polymers and have high capacity for absorption of water and biological fluids. Although widely used in the food and biomedical fields, most HGs are not biodegradable. Nanocellulose hydrogels (NC-HGs) have been extensively applied in the food industry for detection of freshness, chemical additives, and substitutes, as well as the biomedical field for use as bioengineering scaffolds and drug delivery systems owing to structural interchangeability and stimuli-responsive properties. In this review article, the sources, structures, and preparation methods of NC-HGs are described, applications in the food and biomedical industries are summarized, and current limitations and future trends are discussed.
摘要：
作为最丰富和可再生的自然资源，纤维素在水凝胶（HGs）的生产中引起了极大的关注和研究兴趣。为了解决环境问题和新出现的需求，天然产生的HGs的好处包括优异的机械性能和优越的生物相容性。HG是通过线性或支化亲水聚合物的化学或物理交联产生的三维网络,并且具有吸收水和生物流体的高容量。虽然广泛应用于食品和生物医学领域，大多数HGs是不可生物降解的。纳米纤维素水凝胶(NC-HGs)已广泛应用于食品工业中的新鲜度检测,化学添加剂,和替代品，以及生物医学领域，由于结构互换性和刺激响应性，可用作生物工程支架和药物输送系统。在这篇评论文章中，的来源,结构,描述了NC-HGs的制备方法，总结了在食品和生物医学行业的应用，并讨论了当前的局限性和未来趋势。
