QuEChERS样品制备方法
QuEChERS是一种分散固相萃取（dSPE）样品制备技术。QuEChERS是“快速、简便、经济、高效、耐用且安全”（Quick, Easy, Cheap, Effective, Rugged and Safe）的简称。此方法最初针对水果和蔬菜农残分析样品制备而开发，现可用于分析其他类型化学物质，包括PAH（多环芳烃）、PCB（多氯联苯）、PBDE（多溴联苯醚）和阻燃剂。这一概念于2002年推出，现已成为分析化学家协会（AOAC 2007.01）和欧洲标准化委员会（EN 15662：2008）官方方法指定内容。
相关技术文章
- Supel™ QuE Verde combines a novel carbon with zirconia coated silica (Z-Sep+) to provide an optimum balance between planar pesticide recovery and color removal.
- Compared to conventional PSA/C18/GCB cleanup, cannabis extracts cleaned with the Supel QuE Verde mixture showed lower GC/MS background, and better recoveries for many pesticides.
- The odor and pungency of ginger is due to the presence of terpenes, gingerols and shogaols. These compounds contribute to the highly complex matrix of ginger, which subsequently presents a challenge in low level analyses of contaminants. A novel 2-layer SPE cartridge efficiently reduces background for pesticide determination.
- QuEChERs is a solid phase extraction (SPE) technique for sample preparation. Supelco's innovative Z-Sep and Z-Sep+ sorbents demonstrated here extract more fat and pigment than traditional PSA/C18 phases while showing greater analyte recovery and greater reproducibility.
- A procedure for cleanup of green tea extracts provides low background and allowed for the analysis of more pesticides at lower levels than QuEChERS. Uses less solvents and no toluene.
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相关实验方案
- Potency testing in marijuana-infused edibles is an important problem that analytical labs are facing due to the complexity of the involved matrices. Concentration of active ingredients in these edibles can range from a few parts per million to 3.5 parts per thousand. This application demonstrates the extraction and HPLC-UV analysis of the active compounds.
- A short abstract on a method using QuEChERS and GC/MS/MS for determination of fipronil & fipronil sulfone.
- QuEChERS method for pesticide residue analysis requires only small quantities of solvent and is capable of generating recoveries of 70-120% with RSDs <5% for a wide range of compounds.
- Extraction and Analysis of Agricultural Pesticides from Oranges Using the “QuEChERS” Method
- LC/MS/MS Analysis of Pesticide Residues in Pistachios on the Ascentis® Express RP-Amide Column after QuEChERS Extraction
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QuEChERS样品萃取
溶剂萃取技术旨在最大限度提高基底基质中的分析物得率。此技术使用与水混溶的溶剂（通常为乙腈）和高浓度盐和/或缓冲剂，从样品基质中提取目标分析物。溶剂选择对于减少化合物共萃取非常重要。萃取步骤使用盐实现相分离。这类盐充当缓冲剂调节pH值，并从样品中析出水分。
QuEChERS纯化
样品纯化可减少后续分析过程中的干扰成分，毕竟干扰成分可能损坏分析仪器、扰乱分析物鉴定和定量结果。和传统的SPE管样品纯化方法不同，QuEChERS通过将大量SPE吸附剂与萃取提取物混合，促进纯化。纯化所用的吸附剂可去除与目标分析物共萃取的基质干扰成分。在进行GC-MS/MS或LC-MS/MS分析之前，可利用PSA、C18或GCB（石墨化炭黑）吸附剂去除糖、脂质、固醇、有机酸、蛋白质、类胡萝卜素、叶绿素和其他色素。可能需要专用Z-Sep吸附剂去除含颜料或脂肪的复杂基质。
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