Here, I am pleased to present two research studies describing the use of gas chromatography-mass spectrometery (GC-MS) and gas chromatography-electro capture dectectorchemical (GC-ECD) for the analysis of pesticides in strawberries and tea respectively. Sounds like a lovely English afternoon doesn’t it except for the pesticides bit. Did you know that 80% of the strawberries in the United States are supplied by one state, that is, California? Here’s a comprehensive read on all you ever wanted to know about strawberries from how they are grown, why are they getting bigger and yet less flavorful, and what organic strawberries actually mean: The Secret Life Of California’s World-Class Strawberries (link to article).
Study: Comparison of Disposable Pipette Extraction and Dispersive Solid-Phase Extraction in the QuEChERS Method for Analysis of Pesticides in Strawberries
In this study, researchers from the Instituto Politécnico do Porto (Portugal) and Faculdade de Ciências da Universidade do Porto (Portugal) developed GC–MS/MS methods for the identification and quantification of 36 pesticides in strawberries grown conventionally and organically. Click the title above to access the abstract; only the abstract is free.
They compared two types of sample preparation used in the QuEChERS method: dispersive solid-phase extraction and disposable pipette extraction and found that the cleanup in the pipette extraction was faster and easier than in the first type of extraction. By the way, QuEChERS method was covered in this earlier blog post:GC-MS Analysis of Pesticides using QuEChERS Extraction.
One of our ion trap GC-MS solutions (Thermo Scientific Polaris Q GC-Ion Trap MS systems) was used in the method development.
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Study: Simultaneous Determination of Procymidone, Pyridaben and Beta-Cypermethrin Residues in Tea Solution by GC–ECD
In this study, researchers from the Zhejiang Academy of Agricultural Sciences (China) developed a sensitive and effective GC-ECD method for the simultaneous quantitative determination of procymidone, pyridaben and beta-cypermethrin pesticide residues in black and green tea samples. The quantification limits of the three pesticide residues were lower than the maximum residue limits (MRLs) established by European Union. (Click the title above to access the full, free PDF of the study).
One of our GC systems (Thermo Scientific Trace GC Ultra gas chromatograph) equipped with anelectrochemical detector was used in the method development.
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If you have read any similar studies using our instruments, do share them using the he Comments box below; we look forward to hearing from you.