Stain-Guided Tissue Mass Spectrometry for Rapid ROI Analysis
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Solution Overview
Problem
Conventional mass spectrometry imaging techniques for tissue analysis are time-consuming due to the need to analyze the entire sample, often taking many hours or days, and many tissue stains interfere with the ion analysis, altering the sample chemistry and masking compound signals.
Innovation Solution
The method involves staining the tissue sample to identify regions of interest using compatible stains like toluidine blue, methylene blue, or cresyl violet, followed by direct surface sampling techniques such as DESI or laser ablation to generate analyte material directly from these regions, which are then analyzed by mass and/or ion mobility spectrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional mass spectrometry imaging techniques are used to analyze the entire tissue sample, then comprehensive molecular information is obtained, but the analysis time becomes very long (many hours or days)
Solution Approach 1:
The tissue sample is divided into regions of interest based on histological staining patterns. The mass spectrometry analysis is then segmented to focus only on these identified regions rather than analyzing the entire sample, thereby reducing analysis time while maintaining comprehensive molecular information for the relevant areas.
Solution Approach 2:
Histological staining is performed as a preliminary action before mass spectrometry analysis. This staining process identifies and marks regions of interest (such as tumor regions) in advance, allowing the subsequent mass spectrometry analysis to be targeted specifically at these pre-identified areas, thus reducing the overall analysis time.
2Ease of operation
If tissue stains are applied to identify regions of interest, then targeted analysis is enabled, but the stains interfere with ion analysis by altering sample chemistry and masking compound signals
Solution Approach 1:
A carefully selected histological stain acts as an intermediary that provides the necessary contrast for identifying regions of interest while minimizing interference with the mass spectrometry analysis. The stain is chosen specifically because it allows targeted analysis without significantly altering the sample chemistry or masking the compound signals of interest.
Solution Approach 2:
The mass spectrometry analysis parameters are adjusted and optimized to account for the presence of the histological stain. By changing parameters such as ionization conditions, mass range, and detection settings, the system can distinguish between stain-related signals and analyte signals, thereby maintaining analysis reliability despite the presence of the stain.
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 rapid, targeted analysis of tissue samples by focusing on regions of interest, reducing overall experimental time while maintaining accurate molecular information, and enabling automation.
Implementation Method 1
generating analyte material from the one or more regions of interest identified based on the tissue stain using a direct surface sampling technique
Implementation Method 2
direct surface sampling techniques such as DESI or laser ablation to generate analyte material directly from these regions
Data Source
AI summary
Disclosed herein is a method of analysing a tissue sample. The method comprises identifying one or more regions of interest within the tissue sample based on a tissue stain that has been applied to the tissue sample. Analyte material is then generated from the one or more regions of interest identified based on the tissue stain using a direct surface sampling probe (10), which analyte material is then received at a sampling inlet (30) and passed towards a mass and/or ion mobility spectrometer (50) for analysis.