Sol-Gel Composition for Probe Immobilization Without Surface Treatment
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Solution Overview
Problem
Existing protein chip technologies face challenges in immobilizing proteins on glass substrates due to denaturation, inactivation, and degradation, and require surface treatment, which limits their application and increases costs, especially for mass production and substrates that cannot be coated.
Innovation Solution
A method for screening a sol composition that can strongly bind to surface-untreated substrates, such as PMMA, gold, and silicon wafers, using a library of silicate monomers and additives, which forms stable, self-fluorescent spots with high immobilization rates and specificity, allowing for the direct immobilization of probes without surface treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surface treatment is applied to glass substrate to immobilize proteins, then immobilization strength is improved, but protein activity is reduced due to denaturation and inactivation
Solution Approach 1:
The patent introduces a sol-gel composition as an intermediary layer between the glass substrate and proteins. This sol-gel layer contains silicate monomers and additives that form a porous gel structure, serving as a mediator that provides strong immobilization while maintaining a biocompatible environment for protein activity.
Solution Approach 2:
The patent changes the chemical and physical parameters of the substrate surface by applying a sol-gel coating with specific composition ratios (silicate monomers to additives). This transforms the glass substrate into a sol-gel biochip surface with different properties that enable strong protein binding without denaturation.
2Strength
If surface treatment is applied to glass substrate, then protein immobilization is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The sol-gel composition is applied to the glass substrate in advance to form a coating layer before protein immobilization. This preliminary action creates a ready-to-use surface that simplifies subsequent protein immobilization steps and enables mass production.
Solution Approach 2:
The patent modifies the substrate surface parameters by applying a sol-gel coating, which changes the chemical composition and physical properties of the surface, enabling improved protein immobilization without complex treatment processes.
3Ease of manufacture
If conventional DNA chip methods are used for protein chip production, then production process is simplified, but protein denaturation and degradation occur
Solution Approach 1:
The sol-gel composition acts as an intermediary layer that provides a biocompatible environment for proteins, preventing denaturation and degradation while maintaining the simplicity of the production process. The sol-gel layer protects proteins from direct contact with the glass substrate and harsh treatment conditions.
Solution Approach 2:
The patent uses a composite material system consisting of glass substrate, sol-gel coating (with silicate monomers and additives), and immobilized proteins. This composite structure combines the mechanical strength of glass with the biocompatibility of sol-gel, enabling both ease of manufacture and protein stability.
4Ease of manufacture
If sol-gel composition is used to immobilize probes on surface-untreated substrates, then manufacturing cost is reduced, but immobilization rate and specificity must be optimized
Solution Approach 1:
The patent optimizes the parameters of the sol-gel composition, including the ratio of silicate monomers to additives (0.5-2.0), pH (2.0-4.0), and temperature (20-40°C), to achieve high immobilization rates and specificity without requiring surface treatment, thereby reducing manufacturing costs.
Solution Approach 2:
The sol-gel composition is applied to create multiple identical immobilization conditions across the substrate surface, ensuring consistent immobilization rates and specificity throughout the biochip, which is essential for high-throughput screening and diagnostic applications.
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 method enables the creation of sol-gel biochips with high immobilization rates and specificity, maintaining protein activity, and is cost-effective for mass production, applicable to various substrates, and suitable for high-throughput screening and disease diagnosis.
Implementation Method 1
a method for screening a sol composition for sol-gel biochips, which is used to immobilize a probe on a surface-untreated substrate
Implementation Method 2
measuring the adhesion, appearance, transmittance and gelling time of the spots
Data Source
AI summary
The present invention relates to a method for screening a sol composition for sol-gel biochips, which is used to immobilize a probe on a surface-untreated substrate, also relates to a sol composition screened by said method and a sol-gel biochip comprising said sol composition immobilized thereon. The sol composition screened by the disclosed method can be mixed with a probe, and the sol mixture can be integrated on 96-well plates, which are widely used in existing bioassays, without surface treatment. Also, the biochip can provide a sensitive and specific good analysis results because this immobilization methods of probe maintain the nature of probes without modification.