Laser Ablation Sampling With Solvent Flow for Tissue Metabolite Analysis
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Solution Overview
Problem
Current methods for spatially resolved chemical analysis in drug discovery, such as QWBA and MALDI-MS, are inadequate for distinguishing between drug and metabolites, fragment fragile molecules, and lack the capability for high spatial resolution and sensitive chemical analysis of tissue sections, limiting their ability to provide absolute quantification and wide chemical coverage.
Innovation Solution
A method involving a dry deposition process to coat a sample with an impermeable surface treatment composition, followed by solvent supply and exhaust conduits to facilitate laser ablation and transport of sample material for analysis, enabling high spatial resolution and sensitive chemical analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If QWBA is used for spatially resolved quantitation, then chemical information can be obtained, but it cannot distinguish between parent drug and metabolites
Solution Approach 1:
The patent segments the sampling and analysis process into distinct stages: laser ablation for spatially resolved sampling, HPLC for separation of drug and metabolites, and MS for detection. This segmentation allows each technique to perform its optimal function - spatial resolution from ablation, separation power from HPLC, and detection from MS - thereby distinguishing between parent drug and metabolites while maintaining chemical information.
Solution Approach 2:
The patent introduces HPLC as an intermediary between the laser ablation sampling and MS detection. This intermediary separation system resolves the co-eluting drug and metabolite signals that would otherwise be indistinguishable, enabling precise identification and quantitation of each component while preserving the spatial information from the ablation process.
2Measurement precision
If MALDI-MS is used for spatially resolved analysis, then chemical detection is achieved, but fragile molecules are fragmented
Solution Approach 1:
The patent extracts the sampling function from the ionization/detection function. Laser ablation is used to extract and collect material from the tissue surface without immediate ionization, preserving fragile molecules. The collected material is then analyzed using HPLC-MS with soft ionization conditions, separating the gentle sampling process from the detection process to avoid fragmentation of phase II metabolites.
Solution Approach 2:
The patent replaces the direct mechanical/ionization-based sampling of MALDI-MS with a two-stage system: laser ablation (optical field) for sampling followed by HPLC (fluid dynamics) for separation and MS (electromagnetic field) for detection. This substitution of mechanical/ionization processes with optical and electromagnetic fields preserves fragile molecules while maintaining detection capability.
3Ease of manufacture
If traditional sampling methods are used, then simple procedures are maintained, but high spatial resolution and sensitive chemical analysis are not achieved
Solution Approach 1:
The patent merges multiple functions into an integrated laser ablation-HPLC-MS system. The laser ablation probe directly couples with the HPLC injection system, combining spatially resolved sampling, automated separation, and sensitive detection in one workflow. This integration maintains procedural simplicity while achieving high spatial resolution (∼200 μm) and sensitive chemical analysis with absolute quantification.
Solution Approach 2:
The patent creates a universal platform that performs multiple functions: spatially resolved sampling, automated sample preparation, separation of complex matrices, and sensitive detection. This multi-functional system handles diverse drug and metabolite analyses through a single integrated workflow, maintaining ease of operation while achieving high spatial resolution and sensitivity simultaneously.
4Measurement precision
If manual sampling and analysis are used, then detailed examination is possible, but high throughput and automation are limited
Solution Approach 1:
The patent implements self-service automation where the laser ablation probe automatically scans the tissue surface, collects material at each position, and transfers it to the HPLC system for analysis. The system autonomously performs spatially resolved sampling across the entire tissue section without manual intervention, maintaining detailed chemical analysis while achieving high throughput through automated workflows.
Solution Approach 2:
The patent establishes continuous operation where laser ablation sampling, HPLC separation, and MS detection occur in an uninterrupted sequence. The automated probe continuously scans across the tissue section, with each position's material immediately processed through the HPLC-MS system, eliminating idle time and manual transfer steps. This continuous workflow maintains analytical detail while maximizing productivity and throughput.
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
This approach allows for robust, automated, non-labor-intensive, and high-throughput chemical analysis with absolute quantification and wide chemical coverage, suitable for drug discovery applications.
Implementation Method 1
A laser beam is directed from a laser source to the sample and the surface treatment composition. The laser beam will ablate the sample and the surface treatment composition in portions intersected by the laser beam.
Implementation Method 2
Ablated sample material will enter the solvent liquid and will be transported with the solvent away from the sample surface through the solvent exhaust conduit.
Data Source
AI summary
A method and system for sampling a solid sample material can include the step of mounting the sample material on a support. A sample surface is coated with a surface treatment composition in a dry deposition process. A solvent supply conduit for supplying solvent to the sample surface and a solvent exhaust conduit for withdrawing solvent from the sample surface can be provided. Solvent is flowed from the solvent supply conduit to the surface treatment composition and the sample surface such that the solvent contacts the surface treatment composition. A laser beam is directed from a laser source to the sample and the surface treatment composition. The laser beam will ablate the sample and the surface treatment composition in portions intersected by the laser beam. Ablated sample material enters the solvent liquid and will be transported with the solvent away from the sample surface through the solvent exhaust conduit.