Nucleic Acid Solid Support With Electrostatic Layer
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Solution Overview
Problem
Existing microarray technologies face challenges in achieving uniform spot shapes and sizes for nucleic acid immobilization on solid supports, leading to varied signal intensities and reduced analytical accuracy.
Innovation Solution
A nucleic-acid-immobilized solid support is developed with an electrostatic layer containing active ester groups, where the ratio of COO peak intensity to C-C peak intensity in XPS spectra is adjusted between 0.10 to 0.20, allowing for uniform spot formation and enhanced nucleic acid immobilization through the introduction of carboxyl groups and activation to N-hydroxysuccinimide groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nucleic acids are immobilized on a solid support using conventional spotting methods, then nucleic acid immobilization is achieved, but spot shapes become non-uniform (falcated, doughnut-shaped, or spilled out) leading to varied signal intensities
Solution Approach 1:
The invention changes the chemical parameters of the solid support surface by introducing carboxyl groups and activating them to form active ester groups. This chemical modification alters the surface properties to enable uniform nucleic acid spotting, directly resolving the spot shape uniformity issue while maintaining analytical accuracy
Solution Approach 2:
The solid support surface is pre-treated with carboxyl groups and activated before spotting nucleic acids. This preliminary chemical preparation creates optimal conditions for uniform immobilization, preventing spot shape variations before they occur during the spotting process
2Reliability
If the solid support surface is treated to improve nucleic acid immobilization capacity, then immobilization efficiency increases, but spot shape uniformity may deteriorate
Solution Approach 1:
The invention optimizes the carboxyl group content parameter on the solid support surface, achieving a balance where sufficient carboxyl groups provide high immobilization capacity while controlled activation maintains spot shape uniformity. This resolves the contradiction between immobilization efficiency and spot consistency
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 ensures uniform spot shapes and improved immobilization capacity, enhancing the analytical accuracy of microarrays by maintaining consistent signal intensity and preventing stain formation, resulting in a solid support with good appearance and high immobilization efficiency.
Implementation Method 1
an electrostatic layer formed on the base material capable of electrostatically attracting a nucleic acid
Implementation Method 2
functional groups capable of covalently binding with the nucleic acids formed on the electrostatic layer
Data Source
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AI summary
A solid support for maintaining a uniform spot shape while improving the capacity for immobilization of nucleic acids upon spotting of nucleic acids onto a solid support is provided. A substrate has a base material, an electrostatic layer formed on the base material in order to electrostatically attract nucleic acids, and carboxyl groups formed on the electrostatic layer, wherein the ratio, (COO peak intensity)/(C-C peak intensity) in the C1s spectra obtained by X-ray photoelectron spectrometry (XPS) performed for the surface of the substrate ranges from 0.10 to 0.20. The solid support for immobilizing nucleic acids is produced by active esterification of carboxyl groups of the substrate.