MALDI Sample Plate with Boronic Acid Glyco-Affinity Layer
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Solution Overview
Problem
Current MALDI mass spectrometry techniques face challenges in sensitivity, reproducibility, and cost-effectiveness for glycoprotein analysis due to the complexity and heterogeneity of glycans, necessitating a novel sample preparation method for efficient glycoprotein profiling.
Innovation Solution
A sample plate with a stable and easy-to-prepare glyco-affinity layer is developed, comprising an electrically conductive substrate with an organosilane layer, a polymeric multi-amine layer, and a glyco-affinity layer of carboxyalkyl or carboxyaryl boronic acid, which selectively binds to glycoproteins for MALDI mass spectrometry analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SELDI mass spectrometric technique is used for glycoprotein analysis, then protein separation and purification can be achieved, but sensitivity and reproducibility are limited and cost is high
Solution Approach 1:
The patent uses disposable MALDI target plates with pre-coated affinity surfaces instead of expensive, reusable protein chip arrays. This approach eliminates the need for costly chip regeneration and maintenance while maintaining analytical performance, directly addressing the high cost issue of SELDI technology.
Solution Approach 2:
The patent changes the mass spectrometry technique from SELDI to MALDI, which operates under different physical parameters (laser desorption vs. surface enhancement). This parameter change improves sensitivity and reproducibility for glycoprotein analysis while reducing dependency on expensive chip-based systems.
2Adaptability or versatility
If conventional MALDI sample plate is used, then simplicity is maintained, but selectivity for glycoproteins is insufficient due to glycan heterogeneity
Solution Approach 1:
The patent creates a composite affinity surface by combining boronic acid functional groups with MALDI-compatible matrix materials. This composite structure provides both glycoprotein selectivity through boronic acid-glycan interactions and compatibility with MALDI mass spectrometry, achieving enhanced selectivity without excessive complexity.
Solution Approach 2:
The boronic acid functional groups act as intermediaries that specifically bind to glycan moieties on glycoproteins. This intermediary layer enables selective capture of glycoproteins from complex mixtures while maintaining compatibility with subsequent MALDI analysis, solving the selectivity problem.
3Measurement precision
If complex sample preparation is used to improve glycoprotein detection, then sensitivity increases, but preparation time and complexity increase
Solution Approach 1:
The patent pre-coats MALDI target plates with affinity surfaces containing boronic acid groups before use. This preliminary action eliminates the need for complex sample preparation steps during actual analysis, as glycoproteins are directly captured from crude samples. The plates can be stored and reused multiple times, significantly reducing preparation time while maintaining high detection sensitivity.
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 sample plate provides excellent selectivity and cost-effective preparation for glycoprotein analysis, enabling efficient capture and detection of glycoproteins in complex biological samples, improving sensitivity and reproducibility over existing methods.
Implementation Method 1
a glyco-affinity layer of carboxyalkyl or carboxyaryl boronic acid which selectively binds to glycoproteins
Data Source
AI summary
The present invention relates to a sample plate for matrix-assisted laser desorption ionization (MALDI) mass spectrometry having a stable glyco-affinity layer of a carboxyalkyl boronic acid or carboxyaryl boronic acid and a preparation method of the sample plate. The sample plate shows excellent selectivity for glycoprotein, and can be easily and cost effectively prepared. The sample plate is useful for glycoprotein analysis by MALDI mass spectrometry.