Hemoglobin A1c Electrophoresis Using Acidic Buffer
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Solution Overview
Problem
Current methods for analyzing hemoglobin A1c, such as immunization, enzyme methods, affinity chromatography, and HPLC, face challenges in accuracy and cost, particularly in reducing the size and cost of hemoglobin analyzers for group medical examinations, with capillary electrophoresis offering potential but requiring optimization for improved specificity and efficiency.
Innovation Solution
A method involving an electrophoresis solution with specific acidic substances and buffers, where the acidic substance has two or more carboxyl groups with acid dissociation constants lower than the pH of the solution, and a buffer with a dissociation constant greater than the pH minus 0.3, enhancing separation and accuracy in capillary or microchip electrophoresis for analyzing hemoglobin A1c.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If HPLC is used for measuring glycated hemoglobin, then measurement accuracy is improved, but apparatus size and cost cannot be reduced
Solution Approach 1:
The patent changes the separation mechanism from HPLC (hydrophobic interaction) to capillary electrophoresis (electrophoretic mobility based on charge-to-size ratio). This parameter change in the separation principle enables miniaturization while maintaining measurement accuracy for HbA1c
Solution Approach 2:
The patent replaces the mechanical HPLC system with an electrophoretic system using electric fields for separation. This substitution allows the development of smaller, more compact analyzers while achieving comparable or superior measurement precision
2Extent of automation
If affinity chromatography is used for HbA1c measurement, then automated processing is enabled, but measurement accuracy deteriorates due to low specificity
Solution Approach 1:
The patent changes the separation parameter from affinity-based binding to electrophoretic mobility based on charge-to-size ratio. This enables automated capillary electrophoresis systems to achieve high specificity for HbA1c separation while maintaining automated processing capabilities
Solution Approach 2:
The patent uses electrophoretic separation as an intermediary mechanism that provides both automation compatibility and high measurement specificity, overcoming the limitation of affinity chromatography's low specificity
3Volume of moving object
If capillary channel length is reduced for miniaturization, then apparatus size is reduced, but separation accuracy may deteriorate
Solution Approach 1:
The patent employs continuous electrophoretic separation in the capillary channel with optimized buffer conditions, maintaining effective separation even in shorter channels. The continuous application of electric field ensures complete separation of HbA1c components within the reduced channel length
Solution Approach 2:
The patent optimizes electrophoresis parameters including pH, ionic strength, and electric field strength to achieve high separation efficiency in miniaturized capillary channels, compensating for the reduced channel length through enhanced parameter control
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 the separation accuracy and reduces analysis time for hemoglobin A1c, enabling more precise and efficient detection, even in reduced-sized analyzer formats, by optimizing the electrophoresis conditions with specific acidic substances and buffers.
Implementation Method 1
performing electrophoresis of a sample solution containing hemoglobin in a state where an acidic substance having two or more carboxyl groups is present
Implementation Method 2
the two or more carboxyl groups of the acidic substance each have an acid dissociation constant (pKa) lower than the pH of the electrophoresis solution at the time of analysis by 0.7 or more
Data Source
Figure 1A~1C
Figure 2~3
Figure 4~5
AI summary
A method for analyzing hemoglobin by electrophoresis, capable of analyzing hemoglobin A1c (HbA1c) and modified hemoglobin with improved accuracy in a shortened analysis time is provided. The method for analyzing hemoglobin by electrophoresis includes performing electrophoresis under conditions in which an acidic substance having two or more carboxyl groups is present in an electrophoresis solution. At least two of the carboxyl groups of the acidic substance each have an acid dissociation constant (pKa) lower than the pH of the electrophoresis solution at the time of analysis.