Hemoglobin Analysis Using Cation Exchange Chromatography

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Solution Overview

Problem

Existing methods for separating and detecting various hemoglobins, including abnormal hemoglobins and thalassemia markers, from blood samples are not sufficiently rapid or sensitive, particularly in diagnosing hemoglobinopathy and thalassemia.

Innovation Solution

A method utilizing cation exchange chromatography with an eluent having a pH of 8.1 or more and an osmotic pressure of 40 mOsm/kg or less, which includes a buffer without metal ions, such as Bicine, Tricine, or TES, and may contain a hemoglobin denaturing agent, for the separation and detection of hemoglobins.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional HPLC methods with gradient elution are used, then hemoglobin separation is achieved, but the diagnosis speed and sensitivity are insufficient

Engineering Contradiction:

Improvedetection sensitivityVSAvoiddiagnosis speed

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent changes the pH parameter to 8.1 or higher and controls osmotic pressure at 40 mOsm/kg or less, which fundamentally alters the chromatographic separation mechanism to achieve both high sensitivity and rapid diagnosis. This parameter optimization enables clear separation of abnormal hemoglobins and thalassemia markers while maintaining fast analysis speed.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a simplified eluent composition that replicates the essential separation function of complex gradient elution systems. By using a single eluent with optimized pH and osmotic pressure rather than complex gradient systems, the method achieves comparable or superior separation performance with faster analysis time.

Inventive Principle:

Principle #26Copying

2Measurement precision

If conventional eluents with metal ions are used, then hemoglobin separation is achieved, but interference with abnormal hemoglobin detection occurs

Engineering Contradiction:

Improvedetection accuracyVSAvoidmetal ion interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent removes metal ions from the eluent composition entirely, eliminating the source of interference with abnormal hemoglobin detection. This extraction of harmful components allows for accurate detection of abnormal hemoglobins without the masking effects caused by metal ion interactions.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs simple buffer systems (Bicine, Tricine, or TES) without metal ions, replacing complex metal-containing eluent systems. These simple buffers provide sufficient separation performance without the harmful side effects, making the method both safer and more reliable.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Adaptability or versatility

If gradient elution with multiple eluents is used, then comprehensive hemoglobin separation is achieved, but the analysis time increases

Engineering Contradiction:

Improvehemoglobin separation capabilityVSAvoidanalysis time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent employs a single eluent that performs multiple functions: it separates normal hemoglobins, abnormal hemoglobins, and thalassemia markers all in one run. This universal eluent replaces the need for multiple specialized eluents and gradient programs, achieving comprehensive separation in a single, rapid analysis.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The optimized eluent conditions enable rapid passage through the chromatographic column while maintaining effective separation. The high pH and controlled osmotic pressure create optimal flow conditions that reduce analysis time without sacrificing separation quality, allowing the system to 'rush through' the separation process efficiently.

Inventive Principle:

Principle #21Skipping (Rushing through)

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 method allows for the rapid and highly sensitive separation of HbA0, HbA1c, abnormal hemoglobins, and thalassemia markers, facilitating simple, rapid, and sensitive diagnosis of hemoglobinopathy or thalassemia.

Implementation Method 1

separating hemoglobins in a sample by cation exchange chromatography, wherein an eluent having a pH of 8.1 or more and an osmotic pressure of 40 mOsm/kg or less is used for separation of the hemoglobins

Methodology Applied

Scientific EffectCation exchange chromatography: Ion Exchange

Data Source

PatentUS12203945B2Haemoglobin analysis method for detecting abnormal haemoglobins and/or thalassemia markers

Publication Date: 2025.01.21 SEKISUI MEDICAL CO LTD

AI summary

Provided is a method for separating and detecting various hemoglobins including abnormal hemoglobins and thalassemia markers. A method for analyzing hemoglobins, comprising separating hemoglobins in a sample by cation exchange chromatography, wherein an eluent having a pH of 8.1 or more and an osmotic pressure of 40 mOsm/kg or less is used for separation of the hemoglobins.