Microarray Substrate Film Orientation Control
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Solution Overview
Problem
Existing methods for immobilizing biomolecules on substrates for DNA microarrays face challenges in controlling film thickness and orientation of amino groups, leading to variations in biomolecule immobilization and detection sensitivity, and are prone to delamination.
Innovation Solution
A method involving the formation of monomolecular films with oriented oxysilanyl and amino groups on substrates using silane compounds and diamine compounds, respectively, to achieve uniform biomolecule immobilization and enhance delamination resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polylysine and aminosilane are applied on substrate to immobilize biomolecules, then amino groups are introduced on substrate surface, but film thickness and amino group density/orientation cannot be controlled, leading to variation among substrates and immobilization spots
Solution Approach 1:
The invention changes the chemical parameters by using specific silane compounds with controlled hydrolysis and condensation reactions. By controlling the molar ratio of silane compound to catalyst, reaction time, and temperature, the film thickness and amino group density are precisely controlled, eliminating variations among substrates and immobilization spots.
Solution Approach 2:
The silane compound undergoes self-assembly through hydrolysis and condensation reactions to form a uniform monomolecular film on the substrate surface. The amino groups automatically orient themselves in a controlled manner without requiring additional processing steps, achieving uniform biomolecule immobilization across all substrates and spots.
2Reliability
If polylysine and aminosilane films are formed on substrate, then biomolecule immobilization is enabled, but films may delamate depending on processing method
Solution Approach 1:
The invention creates a composite structure where the silane compound forms a cross-linked network that integrates with the substrate surface. This composite material structure provides strong adhesion and delamination resistance while maintaining simplicity in the manufacturing process through a single-step application method.
3Measurement precision
If conventional methods are used to apply amino groups on substrate, then biomolecule immobilization is achieved, but detection sensitivity fluctuates due to variation in amino group orientation
Solution Approach 1:
The invention changes the orientation parameter of amino groups by using the specific hydrolysis and condensation reaction mechanism of silane compounds. The amino groups are formed with controlled orientation toward the outmost surface through adjustment of reaction parameters including pH, temperature, and reaction time, ensuring consistent detection sensitivity across all substrates.
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 allows for controlled density and orientation of amino groups, ensuring uniform biomolecule immobilization and improving detection sensitivity while preventing delamination, resulting in a more precise and reliable microarray substrate.
Implementation Method 1
a step of forming a monomolecular film having orientated oxysilanyl groups toward an outmost surface on a substrate
Implementation Method 2
a step of forming a monomolecular film having orientated amino groups toward an outmost surface on the substrate by applying a solution containing a diamine compound to the oxysilanyl groups
Data Source
AI summary
There is disclosed a method for producing a substrate for making a microarray, the method comprising: at least, a step of forming a monomolecular film having orientated oxysilanyl groups toward an outmost surface on the substrate; and a step of forming a monomolecular film having orientated amino groups toward an outmost surface on the substrate by applying a solution containing a diamine compound to the oxysilanyl groups. There can be provided a method for producing a substrate for making a microarray in which density and orientation of amino groups orientated toward an outmost surface are controllable, and in addition, there is no delamination of a monomolecular film formed on the substrate.