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Quantitative Analysis of Vacuum Induction Melting by Laser-induced Breakdown Spectroscopy

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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.

Rapid Communications in Mass Spectrometry : RCM

|July 10, 2025

Summary

Laser diode thermal desorption (LDTD) coupled with mass spectrometry (MS) enables rapid sample screening. Optimizing critical parameters like gas flow and laser ramp ensures a sensitive and robust analytical procedure.

Keywords:

LDTD ambient ionization laser diode thermal desorption mass spectrometer method development

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Area of Science:

Analytical Chemistry
Mass Spectrometry
Chromatography

Background:

Evaluation of laser diode thermal desorption (LDTD) interfaced with mass spectrometry (MS).
Identification of critical method parameters for developing new analytical procedures.
LDTD-MS offers a rapid screening approach for diverse sample types.

Purpose of the Study:

To conduct an in-depth evaluation of the LDTD-MS interface.
To identify and assess critical parameters for LDTD-MS method development.
To propose practical solutions for optimizing LDTD-MS procedures.

Main Methods:

Solvent extraction of samples spotted in 96-well plates.
Hydrolysis and solid-phase extraction for biological fluids.
Mass spectrometric analysis using atmospheric pressure chemical ionization (APCI) and data-dependent MS/MS acquisition.

Main Results:

Evaluation of five key parameters: sample dilution, gas flow, laser ramp, ion saturation/suppression, and signal enhancement.
Identification of practical solutions for encountered method development challenges.
Demonstration of rapid analysis with a total runtime of 18 seconds per well.

Conclusions:

LDTD-MS facilitates rapid screening of numerous analytes across various samples.
Minimal to complex sample preparation can be accommodated.
Addressing critical method parameters is essential for developing sensitive and robust analytical methods.