Glycan Microarrays on ITO Glass via Non-Covalent Attachment
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Solution Overview
Problem
Current microarray technologies face limitations in miniaturization and sensitivity, particularly for glycan microarrays, due to wasteful pre-tagging strategies and constraints in multimodal readout capabilities, which hinder the analysis of small spot sizes and comprehensive interaction studies.
Innovation Solution
The development of glycan microarrays using a non-covalent ligand attachment strategy on indium tin oxide (ITO) covered transparent glass slides, allowing for in situ functionalization and multimodal analysis by MALDI-Tof-MS, fluorescence, and optical microscopy, enabling efficient immobilization and detection of glycans at a picomolar scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pre-tagging strategies are used for glycan microarrays, then binding agents can be immobilized on the surface, but the process becomes wasteful and time-consuming, limiting miniaturization scale
Solution Approach 1:
Instead of pre-tagging glycans with lipid groups before immobilization, the patent inverts the approach by first creating a hydrophobic tag layer on the surface, then directly immobilizinguntagged glycans in situ. This eliminates the time-consuming pre-tagging step while achieving the same immobilization result.
Solution Approach 2:
The patent performs preliminary action by pre-forming the hydrophobic tag layer on the surface before glycan immobilization. This preparatory step enables direct immobilization of glycans without requiring pre-tagging, thus saving time and reducing waste.
2Measurement precision
If small spot sizes are used for microarrays, then analysis sensitivity should improve, but fabrication and method sensitivity constraints hamper the analysis
Solution Approach 1:
The patent changes the parameter of spot size to micrometer scale (smaller than conventional arrays) while simultaneously changing the immobilization method to direct in situ attachment. This combination enables high sensitivity analysis despite the challenges of fabricating and analyzing such small spots.
3Loss of information
If fluorescent readout methods are used for microarrays, then qualitative information can be obtained, but only qualitative data is provided and binding strength ranking is compromised
Solution Approach 1:
The patent makes the microarray system universal by enabling multiple readout methods (fluorescence, mass spectrometry, and other analytical techniques) to be applied to the same array format. This multi-functionality allows both qualitative and quantitative information to be obtained from the same immobilized glycans.
4Productivity
If off-line isolation onto blotting membranes is used, then affinity-chromatography can be coupled with MALDI-Tof MS, but the process is not direct and less efficient
Solution Approach 1:
The patent merges the affinity-chromatography function and MALDI-Tof MS analysis function into a single integrated platform by directly immobilizing glycans on MALDI-compatible surfaces. This eliminates the need for separate off-line isolation steps onto blotting membranes, reducing process complexity and increasing throughput.
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 the creation of micrometer-scale glycan arrays with enhanced sensitivity and reproducibility, allowing for the analysis of glycan interactions and enzymatic synthesis, and provides structural information through combined mass spectrometry and fluorescence readouts, broadening the applications of microarrays.
Implementation Method 1
the linker molecules comprise a hydrophobic group capable of non-covalently binding to the support layer
Implementation Method 2
the binding agents comprise a functional group capable of reacting in situ on the microarray with the reactive functional group of the linker molecules to covalently link the binding agents to the linker molecules
Implementation Method 3
analysis by MALDI-Tof mass spectrometry
Implementation Method 4
fluorescence readout methods
Data Source
AI summary
The present invention provides microarrays that can be analysed by more than one technique using a non-covalent ligand attachment strategy to solid supports such as indium tin oxide (ITO) covered transparent glass slides. This provides, inter alia, glycan arrays on a micrometer scale which allow multimodal readout by MALDI-Tof-MS, fluorescence and optical microscopy. Glycans functionalized with a C5-aminolinker were attached in situ on a picomolar scale to a hydrophobic tag bound to this surface, thus avoiding the wasteful off-chip ligand tagging of other approaches. Glycan arrays prepared using this methodology were analysed both with a fluorescence scanner and by on-chip MALDI-mass spectrometry in a series of glycomics experiments specifically requiring a multimodal readout.