Ultrafast Mass Spectrometry Imaging via Laser-Based Mass Spectrometry Microscopy

Area of Science:

• Analytical Chemistry
• Biophysics
• Microscopy

Background:

• Mass spectrometry imaging (MSI) is crucial for visualizing molecular distributions in biological samples.
• Current MSI techniques face challenges in balancing spatial resolution, sensitivity, and throughput.
• There is a need for faster, high-resolution MSI methods for cellular and tissue analysis.

Purpose of the Study:

• To develop a novel ultrafast molecular imaging platform.
• To overcome limitations of conventional pixel-by-pixel MSI.
• To enable rapid, high-resolution visualization of molecular distributions in biological systems.

Main Methods:

• Development of a femtosecond laser desorption laser postionization mass spectrometry microscope (fs-LDPI-MSM).
• Utilized laser postionization and plasmonic gold nanoparticles for enhanced ion yields.
• Achieved rapid imaging by bypassing time-consuming pixel-by-pixel interrogation.

Main Results:

• fs-LDPI-MSM demonstrated ultrafast molecular imaging capabilities, completing scans in seconds.
• Achieved 780 nm imaging resolution, 1.5 pm ablation depth, and attomole-level detection limits.
• Successfully visualized lipids in mouse and bee brains, and drug/endogenous compound distributions in single cells.

Conclusions:

• The fs-LDPI-MSM is a powerful tool for high-throughput, ultrafast molecular imaging.
• This technology revolutionizes MSI for cell biology and biomedical applications.
• Enables nanoscale spatial distribution analysis of molecules in complex biological environments.