Cleanup for Analysis of Residual Pesticides in Foods

To ensure the safety of the increasing number of imported food products, residue standards have been established in Japan for over 200 types of pesticides. 

To allow efficiently inspecting for all these pesticides in foods, Japan's Ministry of Health, Labour and Welfare has developed a method for rapid analysis of residues in foods (multiresidue pesticide analysis method) that enables simultaneously analyzing multiple analytes (notified in 1997). This method uses a GPC cleanup method to partially automate the pretreatment process. Due to a partial revision of food standards in 1999, methods other than the test methods specified in the Food Sanitation Act may now be used. 

Therefore, to further automate the process, Shimadzu now offers a Prep-Q system, which connects a GPC cleanup system to a GC-MS system online. This provides an even faster and labor-saving system for screening residual pesticides in foods.


Analysis Procedure

First, an extract containing pesticides is obtained from the food sample and concentrated. 

1. Simultaneous screening analysis of multiple analytes is now possible using a compact GPC column and large-volume sample injection into a GC-MS system.**

2. Connecting GPC-GCMS online cuts the analysis time in half.***

3. Downsizing the GPC column reduces solvent consumption dramatically to 1/200 of the normal level.****

4. Automation reduces manual operations and operator variability.

*** Analysis time per sample is about 80 minutes (30 min for extraction, 10 min for GPC sample preparation and GC automatic concentration and injection, and 40 min for GCMS measurement).

**** About 1 mL of solvent is required per sample for GPC cleanup.

Prep-Q Method Requires Even Less Time Than the "Multiresidue Pesticide Analysis Method"

Examples of Mass Chromatograms and Mass Spectra of Pesticides in Potato Extract

Examples of Mass Chromatograms and Mass Spectra of Pesticides in Potato Extract

■ Related System

Pesticide Residue GPC Cleanup System This GPC cleanup system is the GPC pretreatment portion of the method shown above. These pesticide fractions are used as samples for measurement by GCMS or GC.

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