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Sociedade Brasileira de Espectrometria de Massas – BrMASS
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Simplifying Complex Multi-Residue Pesticide Methodology in GCMS/MS
Authors: David Steiniger1, Juan Carmona1, Stacy Crain1, Paul Silcock1, Jason Cole1,
Grazielle Anaia2
Email ([email protected])
1
Thermo Fisher Scientific, Austin, TX, USA; 2Nova Analítica, São Paulo, SP, BR
The task of setting up a triple quadrupole GC-MS pesticide analysis can be daunting,
regardless the starting point. If a small set of pesticides should be expanded to a larger set of
pesticides to be analyzed or if a large pesticide set of is analyzed in multiple runs on a single
quadrupole and has to be combined into a single MRM analysis, tools that simplify and
facilitate the development of the new method and improve the lab productivity are necessary.
To meet these needs and requirements a GC-MS/MS Pesticide Analyzer system was designed
with all the tools necessary to set up a complex pesticide method, regardless the starting
point. A list of optimized pesticide transitions, an easy to follow step-by-step description of
how to develop new transitions using AutoSRM, and a complete instrument method
developed on an included column with provided compound retention times and MRM
parameters are provided in this comprehensive package, to eliminate days, if not weeks, of
method development.
In addition to simplified method startup, another advantage of this Pesticide Analyzer system
is that it utilizes Timed-SRM methodology, allowing for easy-to-use, high-analyte-capacity
methodology. The usability and scanning efficiency of Timed-SRM are complemented by the
fast-scanning capability of the GC-MS/MS instrument, making the analysis of hundreds of
pesticides, with a total of over one thousand transitions, not just possible, but easy.
Finally, this GC-MS/MS Pesticide Analyzer has the ability to analyze full scan data at the same
time as the targeted MRM analysis. This allows harnessing the power of existing EI full scan
libraries to, for example, finding potential high-level contaminants otherwise missed in a
targeted analysis, or monitors the matrix background for possible interference.
This work presents how to create a method starting from scratch and from an established GC
method, and how to use the system tools that improve the productivity. The software
features as the AutoSRM, a tool that makes the instrument the easiest for developing and
adding new compounds to an existing pesticide method, and Timed-SRM, which enables
accurate pesticide identification and quantitation, even for very dense pesticide
methodologies, are included in this work.
The ability to do Timed-SRM significantly increases low-level sensitivity through a more
efficient SRM scheduling. Also, the full scan/MRM capability of this new triple-quadrupole
mass spectrometer combines the elite quantitation capabilities of MRM analysis with classic
general unknown identification through full scan quadrupole library searching. Finally, the
ability of the instrument to perform simultaneous full scan/MRM provides the capability to
identify general unknowns in conjunction with target pesticides, filling a classic gap in
targeted MRM analysis.
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