Pipette Tip Monolith for Phosphopeptide Desalting
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Solution Overview
Problem
Current extraction technologies for biomolecules, particularly for desalting and isolating phosphorylated peptides and proteins, face challenges in efficiently removing salts and impurities, which suppress mass spectrometry signals and require costly and complex automation processes.
Innovation Solution
Development of hollow monolith porous polymer structures within pipette tips doped with nano-particles like TiO2 and ZrO2, allowing for enhanced permeability and selective retention of biomolecules, enabling efficient desalting and enrichment of phosphorylated peptides and proteins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional SPE materials (C4, C8, C18) are used for desalting and concentrating proteins and peptides, then the degree of desalting is sufficient, but signal suppression by salts and impurities occurs in mass spectrometry
Solution Approach 1:
The patent employs a monolithic porous polymer structure with controlled pore sizes to enable size-based separation. The porous monolith allows small salt molecules to pass through while retaining larger biomolecules, achieving desalting without the signal suppression issues associated with traditional reversed-phase SPE materials
Solution Approach 2:
The invention creates a composite structure by incorporating metal oxide particles (such as titanium dioxide or zirconium dioxide) into the polymer monolith matrix. This composite material combines the size-exclusion properties of the porous polymer with the selective affinity of metal oxides for phosphorylated peptides, enabling both desalting and selective enrichment while preventing signal suppression
2Reliability
If dialysis is used for purification and separation of biological samples, then purification quality is good, but the process is difficult and expensive to automate
Solution Approach 1:
The patent nests the monolithic porous polymer structure directly inside a standard pipette tip, creating a compact integrated device. This nested configuration allows the sophisticated purification functionality to be housed within a simple, automatable format that can be easily manipulated by liquid handling robots and automated workstations
Solution Approach 2:
The invention extracts the complex dialysis process and condenses it into a compact monolithic structure that can be placed within a pipette tip. This extraction of the purification function from the bulky dialysis apparatus enables automation while maintaining purification quality
3Ease of operation
If ultrafiltration and size-exclusion spin columns are used, then sample processing is simplified, but sufficient desalting is not achieved
Solution Approach 1:
The patent applies local quality by creating a monolith with specific pore size distributions in different regions. The monolith is engineered with varying pore sizes to provide both size-exclusion for simple processing and fine-tuned desalting capability, allowing the same structure to perform multiple functions with different efficiency levels
4Reliability
If PGC columns are used to purify carbohydrates and glycopeptides, then purification effectiveness is good, but the method is not suitable for small and hydrophilic peptides prior to MALDI MS
Solution Approach 1:
The patent creates a universal extraction tip by incorporating metal oxide particles with multiple functional properties into the monolithic matrix. The metal oxides provide both hydrophilic interaction capability for carbohydrates and glycopeptides, and reversed-phase-like retention for small hydrophilic peptides, enabling a single device to effectively purify multiple analyte types across different chemical categories
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 hollow monolith structure enhances the interaction and retention of biomolecules, improving the detection of low-abundance phosphorylated peptides and proteins, reducing signal suppression and automating the extraction process, thereby increasing the sensitivity and efficiency of mass spectrometry analysis.
Implementation Method 1
a unique stable, pre-monolith suspension and polymerization process
Implementation Method 2
the resulting extraction tips are highly permeable allowing the sample to pass easily through the monolithic bed structure
Implementation Method 3
Metal oxides such as titanium dioxide (TiO2) or zirconium dioxide (ZrO2) have been successfully applied to selectively retain phosphopeptides from complex biological mixtures
Data Source
AI summary
The present invention relates to a pipette tip which is fitted with a porous organic monolith which is doped with active particles. Due to a unique polymerization method, the extraction tips stay highly permeable which allows sample to pass through the monolithic bed. The extraction tip represents an ideal tool for solid phase extraction, especially for desalting, isolating and purifying biomolecules such as peptides and proteins.