Graphitized Mesoporous Nanocomposites Enables Matrix-Free Soft Ionization for Multi-Class Drug Screening

Area of Science:

• Analytical Chemistry
• Materials Science
• Forensic Science

Background:

• Over a thousand new psychoactive substances (NPS) pose challenges for detection due to structural diversity and illicit use.
• Existing analytical methods struggle with sensitivity and specificity for NPS detection, especially in the low m/z range.

Purpose of the Study:

• To develop a novel surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOF MS) platform for enhanced detection of NPS.
• To improve signal-to-noise ratio and quantification accuracy for small-molecule drugs.

Main Methods:

• Integration of mesoporous graphitic-zeolite nanoparticles (MGNs) with UV-activated photothermal nanomaterials into a SALDI-TOF MS platform.
• Synthesis of MGNs via chemical vapor deposition, yielding high surface area and broadband light absorption.
• Utilizing localized photothermal heating and analyte adsorption for accelerated soft ionization and noise suppression.

Main Results:

• Achieved a 95-fold improvement in signal-to-noise ratio compared to conventional matrices.
• Demonstrated quantification accuracies exceeding 90% for twelve representative compounds across seven drug classes, including diverse NPS.
• Enabled rapid, reproducible, and interference-free detection in the low m/z range (100-500).

Conclusions:

• The MGN-based SALDI-TOF MS platform offers a significant advancement for the sensitive and accurate detection of NPS.
• This technology is crucial for real-time diagnostics and screening in forensic science and public health.
• The reengineered ionization strategy addresses limitations in current analytical methods for complex psychoactive substance analysis.