Sequential injection-cation exchange micro-column system for hemoglobin typing to differentiate HbE carriers

Area of Science:

• Biochemistry
• Analytical Chemistry
• Hematology

Background:

• Hemoglobin (Hb) typing is crucial for diagnosing hemoglobinopathies.
• Conventional methods for HbE detection can be less quantitative or more expensive.
• There is a need for accessible and accurate HbE measurement techniques.

Purpose of the Study:

• To develop and validate a sequential injection (SI) system for automated hemoglobin typing.
• To provide a quantitative method for measuring hemoglobin E (HbE) and differentiating HbE carriers.
• To establish an economical alternative to existing hemoglobin analysis methods.

Main Methods:

• Incorporation of a weak cation exchange micro-column into a sequential injection system.
• Separation of hemoglobin variants (HbF, HbA, HbA(2)/HbE) using a pH gradient mobile phase (pH 6-7).
• Utilizing phosphate buffer solutions for chromatographic separation.

Main Results:

• The SI system provided more quantitative HbE measurements compared to precipitation and anion-exchange methods.
• The system successfully differentiated between normal subjects and HbE carriers.
• The developed method is more economical than commercial ion-exchange HPLC analyzers.

Conclusions:

• The sequential injection system offers a viable, quantitative, and economical approach for hemoglobin typing and HbE detection.
• This automated system enhances diagnostic capabilities for hemoglobin E carriers.
• The SI system presents a practical alternative for hemoglobin analysis in resource-limited settings.