An assay for angiotensin-converting enzyme using capillary zone electrophoresis

Area of Science:

• Biochemistry
• Analytical Chemistry
• Enzymology

Background:

• Angiotensin-converting enzyme (ACE) plays a crucial role in cardiovascular regulation.
• Accurate and efficient methods for determining ACE activity are essential for research and diagnostics.
• Existing methods may lack the sensitivity or speed required for certain applications.

Purpose of the Study:

• To develop a sensitive and rapid method for determining angiotensin-converting enzyme (ACE) activity.
• To utilize capillary zone electrophoresis (CZE) for efficient separation and quantification of enzymatic reaction products.
• To establish a robust assay for ACE activity measurement.

Main Methods:

• A synthetic tripeptide, hippuryl-l-histidyl-l-leucine, was employed as the ACE-specific substrate.
• Capillary zone electrophoresis was performed using a fused-silica capillary with a boric acid-borate buffer.
• ACE activity was determined by quantifying hippuric acid, a product of the enzymatic reaction, via CZE detection at 228 nm.

Main Results:

• The developed method demonstrated high sensitivity and rapidity for ACE activity determination.
• Each electrophoretic run required only nanoliters of reactant solution and was completed in 6 minutes.
• The quantification of hippuric acid accurately reflected the ACE activity.

Conclusions:

• Capillary zone electrophoresis provides a powerful and efficient tool for ACE activity assays.
• The developed method offers a sensitive, rapid, and low-volume approach for enzyme activity determination.
• This technique has significant potential for ACE research and clinical applications.