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TFS has developed a faster screening method for pesticides, enabling labs to simultaneously screen and confirm the presence of more than 1,000 pesticides, at low levels, using a single injection.

The new method, which uses the Thermo Scientific Quantum GC, can acquire 3,000 timed selective reaction monitoring (SRM) transitions per run, increasing sample throughput while ensuring accuracy in a matrix.

The method, detailed in an application note entitled ‘Rapid analysis of 303 pesticide residues in green bean using triple quadrupole GC-MS/MS’, is available via the TFS website.

The GC-MS/MS method enables the rapid screening and confirmation of more than 1,000 pesticides in one injection, increasing productivity and, by delivering results faster, safeguarding human health.

The method is designed to facilitate compliance with the European Council Directive 96/23/EC, which requires at least two SRM transitions per compound.

In this method, scientists analysed 303 pesticides in green beans in a single run using the TSQ Quantum GC under timed-SRM mode.

The timed-SRM function enabled the acquisition of a total of 652 transitions.

The dwell time of each transition was automatically maximised for each compound to give the best sensitivity for all pesticides.

Using this method, linearity and recoveries are achieved within industry requirements and sensitivity can easily reach 0.0040mg/kg for all pesticides in green beans.

According to the company, the new method demonstrates that timed-SRM mode is an extremely effective method for screening and determining large amounts of pesticides at low levels in the sample matrix.

Thermo Fisher Scientific (Chromatography)

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