Sample preparation is a step of huge importance in many modern analytical methodologies; it is often the limiting step. Within this context, the use of membranes has been an interesting research field. Several studies have been performed to make them suitable alternatives to replace more traditional procedures. The advantages of the use of membranes are simplicity, innocuousness, low-cost and easy incorporation within automatic systems. This short review provides a glimpse towards, in particular, membrane-mediated liquid-liquid extraction and membrane-mediated gas diffusion in recent years (i.e., with and without solvent impregnation, respectively), as well as membrane-mediated solid-phase extraction.

在许多现代分析方法中，样品制备是非常重要的一步。这通常是限制步骤。在这种情况下，膜的使用一直是一个有趣的研究领域。已经进行了一些研究，使它们成为替代更传统的程序的合适选择。使用膜的优点是简单，无害，低成本并且易于结合在自动系统中。这篇简短的评论特别概述了近年来的膜介导的液-液萃取和膜介导的气体扩散（即分别具有和不具有溶剂浸渍）以及膜介导的固相萃取。