Since the introduction of the Green Analytical Chemistry guidelines, there has been an increasing concern on the sustainability of sample preparation approaches, particularly if considering they constitute the most time-consuming step of the analytical method and the main source of laboratory wastes. Among the alternatives explored, it is important to highlight the miniaturization of the extraction methods, which has been accompanied by the seek of greener solvents and sorbents. Biopolymers emerge as potential candidates to be used as sorbents in microextraction schemes given their biodegradability, versatility, and easily functionalization. This review offers an overview on biopolymers (chitosan, cellulose, alginate, and agarose) in sorbent-based microextraction approaches, paying attention to the preparation of the sorbent and the format in which biopolymers are incorporated into the sorbent/device, thus implying a specific microextraction approach, their role in the resulting sorbent material, and the reported analytical applications, covering environmental, food, and bioclinical analysis.

自从引入绿色分析化学指南以来，人们对样品制备方法的可持续性越来越关注，尤其是考虑到它们构成分析方法中最耗时的步骤以及实验室废物的主要来源时。在探索的替代方法中，重要的是突出提取方法的小型化，同时伴随着对绿色溶剂和吸附剂的寻求。鉴于生物聚合物的生物降解性，多功能性和易于功能化作用，它们有望在微萃取方案中用作吸附剂。这篇评论概述了基于吸附剂的微萃取方法中的生物聚合物（壳聚糖，纤维素，藻酸盐和琼脂糖），