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Updated: Sep 16, 2025

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Published on: June 10, 2019
Critical Method Parameters to Evaluate When Developing a Method Using a Laser Diode Thermal Desorption (LDTD) Coupled
Jonathan Rochon1, Serge Auger1, Eshwar Jagerdeo2
1Phytronix Technologies Inc., Quebec City, Quebec, Canada.
Rationale:
This paper presents an in-depth evaluation of the laser diode thermal desorption (LDTD) device interfaced to a mass spectrometer and identifies the critical method parameters to evaluate when developing a new procedure.
Methods:
Samples were solvent extracted and spotted in a 96-well plate. In the case of biological fluids, hydrolysis followed by solid phase extraction is required. The solvent in the 96-well plate is evaporated, followed by mass spectrometric analysis (MS) with atmospheric pressure chemical ionization (APCI). Where applicable, the instrument is operated in a data-dependent mode, with a full-scan mass spectrum followed by MS/MS spectra with a total runtime of 18 s per well.
Results:
Five key experiments (sample dilution, gas flow, laser ramp, ion saturation/ion suppression, and signal enhancement) were evaluated as critical parameters that could potentially be encountered in method development, and practical solutions are proposed.
Conclusions:
Interfacing LDTD with a mass spectrometer allows for rapid screening for many analytes in a wide range of samples, with either minimal or complex sample preparation. Addressing all critical method parameters can aid in creating a sensitive and robust procedure.
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