Related Experiment Video
Updated: Aug 17, 2026

Use of Enzymatic Biosensors to Quantify Endogenous ATP or H2O2 in the Kidney
Published on: October 12, 2015
Antioxidant power of angiotensin-converting enzyme inhibitors in vitro
1Department of Nursing & Health Sciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon.
Aims:
There is controversy regarding the potential antioxidant effect of captopril, therefore this study was performed to compare the in vitro antioxidant power of captopril with other angiotensin-converting enzyme (ACE) inhibitors.
Methods:
Antioxidant power of captopril, enalapril, fosinopril, perindopril, quinapril and ramipril in aqueous solution was measured using the ferric reducing (antioxidant) power (FRAP) assay; captopril was also measured in ethanolic solution.
Results:
Only captopril showed significant antioxidant power, demonstrating a stoichiometric factor of 1.0 in this assay. Concentration-related antioxidant power was seen in both aqueous and ethanolic solutions.
Conclusions:
Captopril shows antioxidant activity in vitro. This property could be relevant in vivo if captopril is concentrated in membranes, lipoproteins or at other important sites.
More Related Videos
Related Concept Videos
Enzyme Inhibition
Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors
Antihypertensive Drugs: Angiotensin II Receptor Blockers
Antihypertensive Drugs: Direct Renin Inhibitors
Heart Failure Drugs: Inhibitors of Renin-Angiotensin System

