Photo-Caged MALDI Matrix Composition for Vacuum-Stable Analysis
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Solution Overview
Problem
Conventional MALDI-MS methods face challenges with MALDI matrix compounds that lack long-term stability under vacuum conditions, leading to premature evaporation and limitations in high-throughput analysis of multiple samples over extended periods.
Innovation Solution
A Photo-caged MALDI Matrix Compound is developed, comprising a Photoremovable Protecting Group Moiety B covalently bonded to an organic MALDI Matrix Compound Moiety A, which is stable under vacuum and releases a suitable MALDI matrix compound upon irradiation, enhancing stability and analytical capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MALDI matrix compounds are used, then the analysis can be performed with simple composition, but the matrix compound evaporates prematurely under vacuum conditions
Solution Approach 1:
The patent applies preliminary action by attaching a protecting group to the MALDI matrix compound before use. This protecting group prevents evaporation during storage and vacuum conditions, and is removed only when needed through photolysis, ensuring the matrix compound remains stable until the analysis moment.
Solution Approach 2:
The protecting group acts as an intermediary substance that temporarily modifies the MALDI matrix compound to prevent evaporation. This intermediary is introduced, maintains stability under vacuum, and is then removed through light irradiation to restore the functional matrix compound.
2Productivity
If multiple samples are analyzed over extended periods, then high-throughput analysis is achieved, but matrix compound evaporation limits the measurement duration
Solution Approach 1:
The protecting group is attached in advance to prevent evaporation during extended measuring cycles, enabling high-throughput analysis of multiple samples over prolonged periods without matrix compound degradation or premature evaporation.
Solution Approach 2:
The patent changes the physical-chemical parameters of the matrix compound by attaching the protecting group, which alters the vapor pressure and stability characteristics, allowing extended measurement durations while maintaining high-throughput capability.
3Reliability
If a photoremovable protecting group is attached to the MALDI matrix compound, then stability against evaporation is improved, but the device complexity increases
Solution Approach 1:
The patent modifies the matrix compound's chemical structure by attaching a photoremovable protecting group, changing its physical-chemical parameters to reduce vapor pressure and improve stability, while the added structural complexity is offset by the simplicity of the photolysis activation step.
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
The Photo-caged MALDI Matrix Compound provides increased stability against evaporation, allowing for extended measuring cycles and improved high-throughput analysis in MALDI-MS and MALDI-MSI methods, enabling more efficient analysis of larger sample cohorts with higher spatial resolution.
Implementation Method 1
the Photoremovable Protecting Group Moiety B is covalently bonded to an organic MALDI Matrix Compound Moiety A... releases a suitable MALDI matrix compound upon irradiation
Implementation Method 2
irradiating the matrix material with the embedded analyte with a pulsed laser to trigger ablation and desorption thereof from the object slide
Data Source
AI summary
The present invention relates to a Photo-caged MALDI Matrix Compound for use in a method of matrix-assisted laser desorption/ionization mass spectrometry, as well as to a sprayable liquid composition and a Photo-sensitive MALDI Matrix Composite, both comprising said Photo-caged MALDI Matrix Compound. Moreover, the present invention pertains to a matrix-assisted laser desorption/ionization mass spectrometry method involving the Photo-sensitive MALDI Matrix Composite and the Photo-caged MALDI Matrix Compound. Under a further aspect, the present invention pertains to a method of identifying for a given type of analyte and predetermined vacuum conditions a suitable Photo-caged MALDI Matrix Compound.