Myoglobin determination by high-performance liquid chromatography

Area of Science:

• Biochemistry
• Analytical Chemistry
• Clinical Diagnostics

Background:

• Myoglobin is a protein found in muscle tissue.
• Elevated myoglobin levels in urine or serum can indicate muscle damage or myoglobinuria.
• Accurate and efficient detection methods are crucial for clinical diagnosis.

Purpose of the Study:

• To develop and validate an anion-exchange chromatography method for separating and quantifying myoglobin in biological samples.
• To assess the clinical utility of the method for diagnosing myoglobinuria.

Main Methods:

• Anion-exchange chromatography using a slurry-packed column.
• Direct injection of urine or serum samples.
• Isocratic elution with Tris buffer.
• Detection of myoglobin peaks and comparison with horse myoglobin standard.

Main Results:

• The method successfully separated human muscle myoglobin into two peaks, with one peak increasing upon storage.
• The latter peak, also observed in horse myoglobin, was typically detected in urine of myoglobinuria patients.
• Detected urine myoglobin levels in patients ranged from 20 to 3000 mg/l, with undetectable levels in normal subjects.
• Urine myoglobin was found to be unstable and required immediate analysis.

Conclusions:

• The developed anion-exchange chromatography method is a fast, simple, and clinically useful technique for confirming and quantifying myoglobin in patients with myoglobinuria.
• While not sensitive enough for normal subjects, the method aids in diagnosing myoglobinuria.
• Further enhancements with more sensitive detectors could broaden the method's applicability.