Ambient Infrared Laser Ablation Mass Spectrometry with Solvent Probe
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Solution Overview
Problem
Current mass spectrometry techniques for analyzing complex biological samples, such as tissues and biofilms, face challenges in providing high spatial and temporal resolution with minimal sample modification, especially when analyzing living systems, due to low transfer efficiency and significant sample losses during laser ablation.
Innovation Solution
The development of a system for ambient infrared laser ablation mass spectrometry (AIRLAB-MS) using an infrared microscope with a continuous flow solvent probe coupled to a Fourier transform ion cyclotron resonance mass spectrometer, which achieves high transfer efficiency by capturing the ablation plume in a solvent and ionizing it via electrospray, minimizing sample losses and fragmentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mass spectrometry techniques (MALDI, SIMS) are used for analyzing biological samples, then chemical information with high molecular specificity can be obtained, but sample preparation is extensive and vacuum conditions prevent analysis of living systems
Solution Approach 1:
The invention changes the operational parameters from vacuum to ambient pressure conditions, enabling analysis of living systems without extensive sample preparation while maintaining chemical information accuracy through the use of atmospheric pressure chemical ionization (APCI) source
Solution Approach 2:
The invention introduces an atmospheric pressure chemical ionization source as an intermediary between the laser ablation process and mass analysis, allowing samples to be ionized and transferred under ambient conditions without requiring vacuum, thus eliminating extensive sample preparation while preserving molecular specificity
2Measurement precision
If laser ablation is used to remove molecules from samples for mass spectrometry detection, then chemical information can be obtained, but significant sample losses occur during the ablation process
Solution Approach 1:
The invention introduces a controlled atmosphere and APCI source as intermediaries that capture and efficiently transfer ablated material to the ionization region, minimizing sample loss while maintaining the ability to obtain chemical information from the ablated sample
Solution Approach 2:
The invention uses atmospheric pressure and gas flow dynamics to transport ablated material efficiently from the sample surface to the ionization source, reducing sample loss by utilizing pneumatic conveyance of vaporized components through the atmospheric pressure interface
3Measurement precision
If high spatial resolution imaging is achieved through laser ablation, then detailed chemical distribution can be mapped, but transfer efficiency of ablated material to the detector remains low
Solution Approach 1:
The invention employs atmospheric pressure gas flows to efficiently transport ablated material from the high spatial resolution laser ablation zone to the APCI ionization source, maintaining the spatial resolution benefits while dramatically improving transfer efficiency through pneumatic conveyance
Solution Approach 2:
The invention changes the pressure parameter from vacuum to atmospheric pressure, enabling efficient material transport and ionization that improves transfer efficiency while preserving the spatial resolution capabilities of laser ablation through optimized atmospheric interface conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
AIRLAB-MS achieves a transfer efficiency of approximately 50% with low biomolecule fragmentation, allowing for high reproducibility and detailed spatial analysis of chemical compositions in biological samples, such as tobacco leaves, with standard deviations less than 10% and higher nicotine levels in genetically modified plant varieties.
Implementation Method 1
an infrared laser is used to ablate a sample
Implementation Method 2
the ablated material is captured in solvent and ionized by electrospray
Data Source
AI summary
A new experimental setup for spatially resolved ambient infrared laser ablation mass spectrometry (AIRLAB-MS) that uses an infrared microscope with an infinity-corrected reflective objective and a continuous flow solvent probe coupled to a Fourier transform ion cyclotron resonance mass spectrometer is described. The efficiency of material transfer from the sample to the electrospray ionization emitter was determined using glycerol/methanol droplets containing 1 mM nicotine and is ˜50%. This transfer efficiency is significantly higher than values reported for similar techniques.