The concept of dispersive solid phase extraction (dSPE) cleanup (otherwise known as QuEChERS method) for the analysis of contaminants in food samples is an example of just enough cleanup before the end-analysis is performed. The current SPE phases for QuEChERS include: C18 for the removal of lipid components, primary-secondary amine (PSA) for the removal of acids, polar pigments and sugars, and graphitized carbon black (GCB) for the removal of pigments such as chlorophyll. Here we introduce the use of a new SPE phase, Z-Sep+, and compare it to the most common sorbents used for cleanup. The first application that will be discussed is analysis of pesticides with detection by LC-MS. The cleanup and the recovery of pesticides was evaluated from a number of foods (olives, nuts) when Z-Sep+ cleanup or conventional sorbent cleanup were used. The second application is analysis of pesticides in high-fat fruit (avocado) by GC-MS. We have found that Z-Sep+ sorbent is performing better then C18 for the removal of fats in model solutions including glycerides and phospholipids. It was applied to the cleanup of the avocado extracts in combination with and without the PSA sorbent. The recoveries and the method ruggedness by both methodologies will be discussed

Analysis of pesticides by QuEChERS in fatty samples: Application of Z-Sep+ sorbent

244th National Meeting (2012)

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