Capillary Electrophoresis Substrate Modification for Reproducibility
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Solution Overview
Problem
Conventional capillary electrophoresis methods face issues with reproducibility and sharpness of separation due to insufficient functional group modification on the inner wall surfaces of microchip devices, leading to variations in measurement results and poor peak resolution.
Innovation Solution
A substrate modification method involving the immobilization of succinic acid or succinic anhydride, pyromellitic acid or pyromellitic dianhydride, chondroitin sulfate, and succinic acid on the inner wall surfaces of capillary electrophoresis devices through covalent bonding, enhancing the density and uniformity of functional groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional substrate modification methods are used, then functional groups can be introduced to the inner wall surface, but reproducibility and sharpness of separation are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the substrate surface by introducing specific functional groups (carboxyl groups via succinic acid/anhydride or pyromellitic acid/dianhydride) at controlled densities. This chemical parameter modification ensures consistent electroosmotic flow and improves both reproducibility and separation sharpness across different measurements and devices.
Solution Approach 2:
The patent applies functional group modification specifically to the inner wall surface of the channel where separation occurs, creating a localized functionalized region. This local quality enhancement ensures that the modification is concentrated where it is most needed for controlling electroosmotic flow and improving separation performance, without unnecessarily modifying other parts of the device.
2Reliability
If functional groups are introduced to control electroosmotic flow, then separation can be achieved, but peak width is large and detection sensitivity is low
Solution Approach 1:
The patent optimizes the density and type of functional groups introduced to the substrate surface. By carefully controlling the concentration of carboxyl groups through specific chemical reactions (using succinic acid/anhydride or pyromellitic acid/dianhydride), the patent achieves optimal electroosmotic flow that produces narrow peaks and enhances detection sensitivity without sacrificing flow control.
3Ease of manufacture
If conventional modification methods are used, then substrate surface can be functionalized, but uniformity of functional group distribution is insufficient
Solution Approach 1:
The patent employs a preliminary surface treatment step where the substrate surface is first prepared (e.g., plasma treatment or chemical etching) to create uniform reactive sites before introducing the functional groups. This preliminary action ensures that subsequent functionalization proceeds uniformly across the entire inner wall surface, achieving consistent functional group distribution.
Solution Approach 2:
The patent uses intermediary chemical compounds (succinic acid/anhydride or pyromellitic acid/dianhydride) as mediators to achieve uniform functional group distribution. These intermediary substances facilitate controlled and even attachment of functional groups to the substrate surface through well-defined chemical reactions, ensuring uniformity in the final functionalized surface.
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 improves reproducibility and sharpness of separation in capillary electrophoresis by ensuring a sufficient and uniform distribution of functional groups, reducing peak width and enhancing detection sensitivity.
Implementation Method 1
the modification groups are immobilized to the substrate surface by covalent bonding to a molecule on the substrate surface
Implementation Method 2
The introduction of a functional group to an inner wall surface of a channel is useful for controlling the occurrence of electroosmotic flow (EOF) in the channel
Implementation Method 3
separation analysis is carried out by capillary electrophoresis with the use of a microchip device
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
Provided is a substrate modification method that enables improvement of reproducibility in measurement with use of capillary electrophoresis. The substrate modification method includes immobilizing, to a substrate surface, at least two types of modification groups selected from three types of modification groups that are a type of a modification group having one functional group, a type of a modification group having two to nine functional groups, and a type of a modification group having ten or more functional groups.