样品前处理-离子色谱法应用于食品分析的研究进展

Recent applications of sample pretreatment techniques in food analysis by ion chromatography

离子色谱是无机和有机离子分析中的重要手段,已经广泛应用于食品分析领域。但是样品的前处理往往占去大部分的分析时间,而且是决定分析结果成败的关键因素。探索快速、高效、简便、自动化的样品前处理新方法已成为目前离子色谱研究中的前沿课题。本文综述了离子色谱样品前处理技术应用于食品分析的研究进展。通过分析样品的提取、净化、浓缩与富集痕量物质3个方面,总结了样品前处理-离子色谱法在食品分析中的应用现状。其中,样品的提取主要阐述了加速溶剂萃取和微波辅助萃取的研究;样品的净化主要包括在线超滤法、在线渗析法等膜技术和采用了反相材料、离子交换树脂、螯合树脂和其他新型材料的固相萃取技术;浓缩方法主要综述了微波浓缩和柱切换法的进展。

Ion chromatography was an important tool for the determination of organic and inorganic ions. It was widely used for analyzing food samples. However, the conventional sample pretreatments were always time-consuming, costly and complex. To date, many techniques were developed to eliminate the matrix and enrich the trace analytes in food samples. The applications of novel sample pretreatment techniques in ion chromatography were reviewed in this paper. The sample extraction, clean-up procedures and enrichments in food samples were described respectively. The extraction methods included the accelerated solvent extrac-tion and microwave-assisted extraction;the clean-up methods included membrane techniques (on-line ultra-filtration and on-line dialysis) and solid phase extractions (reverse phase materials, ion exchange resins, chelate resins and carbon materials); the enrichment methods included microwave preconcentration and column switching technique.