Prep-Q
GPC-GCMS
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. Use a GPC
column to separate oil/fat and dye components from pesticide components based
on differences in molecular weight.
2. Use a flow
line switching valve to reject oil/fat and dye components and trap pesticide
components in the sample loop.
3. Use the newly
developed large-volume GC-MS injection method to inject the concentrated
pesticide components trapped in the loop into the GC column.
4. Use GC-MS to
simultaneously analyze multiple pesticide components (screening analysis).
Applicable Substances
Chlorine-based pesticides, pyrethroids, organophosphorus
pesticides, nitrogen-based pesticides, and carbamate pesticides contained in
agricultural products* * Excluding leachates from tea
Features
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.
** Jointly developed
based on the concept and direction from the Osaka Prefectural Institute of
Public Health
*** 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.
**** 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"
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.
ĐẠI DIỆN ĐỘC QUYỀN SHIMADZU TẠI VIỆT NAM
Hotline: 0902 550 957
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