“In addition, the concentrations of capsaicin required for 50% inhibition of NADH oxidase activity of bovine submitochondrial particles were increased when ubiquinone-10 was added to the particles.”
“Where the NADH-quinone oxidoreductase segment involved an energy coupling site (e.g., in Paracoccus denitrificans, Escherichia coli, and Thermus thermophilus HB-8 membranes and bovine heart mitochondria), capsaicin acted as an inhibitor of ubiquinone reduction by NADH.”