Virus and Exosome Sample Preparation for MALDI-ToF MS
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Solution Overview
Problem
Current methods for processing biological samples for MALDI-ToF MS analysis often obscure virus-originating and extracellular vesicle-originating marker peaks due to conditions introduced by sample processing procedures, such as the use of inorganic salts and enzymes, which reduce detector sensitivity and fragment analytes, making it difficult to detect diagnostic markers for viral infections and biomarkers.
Innovation Solution
A method involving the use of cationic viral envelope/vesicle disruptor compounds and disulphide reducing agents in combination with mass spectrometry-grade solvents, along with volatile organic solvents like acetone for precipitation, to prepare biological samples for MALDI-ToF analysis, which helps in forming a precipitate that can be separated and analyzed without interfering with the detection of diagnostic peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If inorganic salts and enzymes are used in sample processing procedures, then the sample preparation can be completed, but the detector sensitivity is reduced and virus-originating marker peaks are obscured
Solution Approach 1:
The patent removes inorganic salts and enzymes from the sample processing procedure. Specifically, it eliminates salts like CaCl2 that generate charge interfering with MALDI ionization, and avoids enzymatic digestion that fragments analytes. This extraction of harmful components restores detector sensitivity and reveals virus-originating marker peaks without compromising the ability to prepare samples.
Solution Approach 2:
The patent introduces mass spectrometry-grade solvents as intermediary substances to replace traditional sample processing reagents. These solvents serve as mediators that enable sample preparation without introducing interfering substances, allowing the sample to be processed while maintaining compatibility with MALDI-ToF MS detection.
2Ease of operation
If traditional sample processing procedures are used, then the sample can be prepared for analysis, but virus-originating marker peaks are obscured making diagnosis difficult
Solution Approach 1:
The patent converts the potential harm of sample processing artifacts into benefit by using a simplified procedure with mass spectrometry-grade solvents. This approach eliminates the generation of interfering substances while maintaining sample preparation capability, thereby converting what was previously a harmful process into a beneficial one that enhances marker detection.
3Ease of manufacture
If inorganic salts are used in sample preparation, then the sample can be processed, but charge generated from MALDI matrix material interferes with ionisation of virus-originating markers
Solution Approach 1:
The patent extracts inorganic salts from the sample preparation procedure. By removing salts like CaCl2 that are commonly used in digestion buffers, the method eliminates the source of charge interference with MALDI ionization, thereby restoring reliable ionization of virus-originating markers while maintaining sample processing feasibility through alternative reagents.
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 enables sensitive and reliable detection of virus-originating and extracellular vesicle-originating markers, providing a cost-effective and rapid means for diagnosing viral infections and identifying biomarkers, even in complex samples, with improved sensitivity and reduced interference from sample processing artifacts.
Implementation Method 1
treating the sample at a temperature of from -25° C. to 18° C. with a volatile organic solvent to form a precipitate
Implementation Method 2
matrix assisted laser desorption ionisation time of flight mass spectrometry (MALDI-ToF MS)
Implementation Method 3
the process of soft-ionization causes little or no fragmentation of analytes
Implementation Method 4
matrix assisted laser desorption ionisation time of flight mass spectrometry (MALDI-ToF MS)
Data Source
AI summary
Provided are methods for preparing a biological sample for analysis for the presence of a virus, or an exosome or other extra-cellular vesicle, by matrix assisted laser desorption ionisation time of flight mass spectrometry (MALDI-ToF MS). The preparation involves mixing the sample with at least one cationic viral envelope/vesicle disruptor compound, or at least one disulphide reducing agent, or a combination thereof; and at least one mass spectrometry grade solvent. Also provided are methods for analysing a biological sample for the presence of a virus, or an exosome or other extra-cellular vesicle, using MALDI-ToF MS once prepared.