Magnetic Particles for LC-MS/MS Sample Prep
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Solution Overview
Problem
Current sample preparation methods for liquid chromatography-tandem mass spectrometry (LC-MS/MS) are inefficient for extracting and quantitatively detecting low molecular weight analytes from complex biological matrices like serum, plasma, and whole blood, as they require laborious and technically demanding processes, and existing methods like protein precipitation and solid phase extraction are not suitable for fully automated workflows.
Innovation Solution
The use of functionalized magnetic particles with a hydrophobic surface for extracting low molecular weight compounds from complex biological samples, where the particles reversibly bind analytes, allowing for efficient separation and elution, even in the presence of abundant lipids, peptides, and proteins, and enabling quantitative detection by LC-MS/MS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If protein precipitation or solid phase extraction is used for sample preparation, then analyte extraction can be achieved, but the process becomes laborious and technically demanding, preventing full automation
Solution Approach 1:
The patent replaces traditional mechanical separation methods (centrifugation, filtration) with magnetic field-based separation. Magnetic particles functionalized with C18 alkyl groups are used to bind analytes, and a magnetic field is applied to separate the bound analytes from the sample matrix, enabling automation without complex mechanical operations
Solution Approach 2:
The patent changes the physical-chemical parameters of the sample preparation system by using magnetic particles with hydrophobic surfaces that can reversibly bind analytes through hydrophobic interactions. The binding can be controlled by adjusting solvent composition (acetonitrile/methanol with formic acid), allowing automated control of analyte retention and elution
2Manufacturing precision
If traditional extraction methods are used, then analytes can be extracted, but ion suppression occurs and analytical purity is reduced
Solution Approach 1:
The patent selectively extracts low molecular weight analytes from complex biological matrices using magnetic particles functionalized with C18 alkyl groups. The hydrophobic surface of the particles selectively binds the analytes while leaving behind proteins, lipids, and other matrix components that cause ion suppression, thereby taking out only the desired analytes for pure analysis
Solution Approach 2:
The patent applies local quality by functionalizing only the surface of magnetic particles with C18 alkyl groups, creating a localized hydrophobic region that selectively interacts with analytes. This localized functionalization allows specific analyte binding while the rest of the particle structure remains magnetic and separable
3Productivity
If magnetic particles are used for extraction, then automation is enabled and extraction efficiency improves, but the process requires specific particle/sample ratios and controlled conditions
Solution Approach 1:
The patent creates a universal extraction system using magnetic particles functionalized with C18 alkyl groups that can extract multiple different low molecular weight analytes from various biological matrices (serum, plasma, whole blood). The same particle type and general protocol work across different analytes and sample types, reducing the need for analyte-specific optimization
Solution Approach 2:
The patent establishes optimized parameter ranges (particle/sample ratio ≥1.25 mg/ml, specific solvent compositions) that provide robust extraction across different analytes. These parameter specifications create a controlled but reproducible process that balances extraction efficiency with ease of implementation
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 method significantly enhances the extraction and purification of low molecular weight analytes, reducing ion suppression and increasing analytical purity, making the process more efficient and amenable to full automation, thus improving the quality and speed of LC-MS/MS analysis.
Implementation Method 1
functionalized magnetic particles with a hydrophobic surface which are capable of binding low molecular weight compounds when added to complex biological samples
Implementation Method 2
separating the particles by applying a magnetic field
Data Source
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AI summary
The present invention provides a novel procedure of preparing samples for analysis by way of mass spectrometry, preferably LC-MS/MS. Accordingly, functionalized magnetic particles with a hydrophobic surface are used for extracting low molecular weight compounds from complex liquid biological samples such as plasma, serum, whole blood or hemolyzed blood. The method of the invention includes (a) contacting the sample with an amount of functionalized magnetic particles with a hydrophobic surface, (b) incubating the sample and the particles, thereby adsorbing the compound to the hydrophobic surface, (c) separating the particles by applying a magnetic field and removing the liquid, (d) optionally washing the particles, (e) eluting the compound from the particles.