Integrated Proteomics Reactor for Sample Loss Reduction
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Solution Overview
Problem
Current proteomics sample preparation methods face challenges with sample contamination, loss, and inefficient peptide detection due to multiple sample transfers and the limitations of existing reactors, particularly with SCX resin-based fractionation affecting detection efficiency and requiring additional salt removal, which compromises the analysis of hydrophobic proteins.
Innovation Solution
A fully integrated proteomics sample preparation device, SISPROT, that integrates protein sample preparation, strong anion exchange fractionation, and high-pH reversed-phase fractionation within a pipette tip, using strong cation or anion exchange resin fillers and a C18 membrane for efficient enzymatic digestion and fractionation, enabling automated high-throughput processing and improved reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple sample transfers are performed in conventional proteomics preparation methods, then sample processing steps can be completed, but sample contamination and loss increase
Solution Approach 1:
The patent combines multiple sample preparation steps (lysis, reduction, alkylation, digestion, desalting, and fractionation) into a single integrated reactor system. The reactor contains stacked functional membranes (C18 membrane, SCX membrane, SAX membrane) that perform different functions in sequence without requiring sample transfer between vessels, thereby eliminating contamination risks and sample loss associated with multiple transfers.
Solution Approach 2:
The integrated reactor serves multiple functions simultaneously: it acts as a lysis buffer reservoir, contains reduction and alkylation reagents, provides enzymatic digestion environment, performs desalting, and executes fractionation. This multi-functional design eliminates the need for separate vessels for each step, resolving the contradiction between processing efficiency and sample loss.
2Quantity of substance
If SCX resin is used for peptide fractionation, then fractionation can be performed, but peptide detection efficiency by mass spectrometer is affected due to high concentration salt
Solution Approach 1:
The patent divides the fractionation process into two distinct stages using different membranes: the SCX membrane performs cation exchange fractionation to separate peptides by charge, while the SAX membrane performs anion exchange fractionation to further separate by charge at different pH conditions. This segmentation allows salt to be removed in the SAX stage, resolving the contradiction between fractionation capability and detection efficiency.
Solution Approach 2:
The SAX membrane acts as an intermediary between the SCX fractionation and the mass spectrometer detection. It captures the peptides eluted from the SCX membrane and allows for salt removal through washing steps, thereby mediating the transition from salt-containing fractionated peptides to clean peptides suitable for mass spectrometer analysis.
3Quantity of substance
If in-StageTip method uses SCX membrane for peptide fractionation, then fractionation is achieved, but additional salt removal is required resulting in sample loss
Solution Approach 1:
The patent merges the fractionation and salt removal functions into a single integrated reactor system. The SCX membrane performs fractionation while the SAX membrane simultaneously provides salt removal capability in the same device, eliminating the need for separate salt removal steps that cause sample loss in the in-StageTip method.
4Device complexity
If lysis buffer contains no detergent, then sample preparation is simplified, but solubility and extraction of hydrophobic proteins are negatively affected
Solution Approach 1:
The patent applies different chemical environments to different regions of the sample processing: the lysis buffer contains detergent (e.g., SDS or CHAPS) to ensure complete lysis and extraction of hydrophobic proteins, while subsequent washing buffers are detergent-free to prevent interference with downstream analysis. This local quality differentiation resolves the contradiction between extraction efficiency and analysis compatibility.
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
SISPROT enables large-scale identification of proteins from limited samples with enhanced reproducibility and accuracy, improving enzymatic digestion efficiency and peptide detection, while maintaining compatibility with liquid chromatography-mass spectrometry, thereby overcoming the limitations of existing methods.
Implementation Method 1
a Strong Cation Exchange (SCX) monolithic capillary column, has realized the preconcentration, reduction, alkylation and enzymatic digestion of proteins
Implementation Method 2
high-pH reversed-phase fractionation of peptides
Implementation Method 3
peptide SAX fractionation
Data Source
AI summary
Disclosed is a proteomic reactor, comprising a pipette tip, an ion exchange resin filler and a solid-phase extraction membrane. The solid-phase extraction membrane is filled into the lower end of the pipette tip, and the ion exchange resin is filled into the lower end of the pipette tip and is located above the solid-phase extraction membrane. The ion exchange resin is a strong cation exchange resin or a strong anion exchange resin. Disclosed is a protein chromatographic separation platform comprising the proteomic reactor and a liquid chromatography-mass spectrometer. Disclosed is the use of the proteomic reactor and protein chromatographic separation platform in the protein identification and protein quantitative analysis of a cell, a tissue or a blood sample.