After the measurement of ADP-stimulated respiration of complex I and complex II, the incubation buffer containing mitochondria was taken from the respiration chamber and immediately supplemented with the ATP assay mix diluted 1:5 (ATP Bioluminescence Assay Kit, Sigma-Aldrich, St. Louis, MO, USA). Mitochondrial ATP production was determined immediately after each respiration measurement and compared with ATP standards using a 96-well white plate in a spectrofluorometer (SpectraMax® M3, Molecular Devices, San Jose, CA, USA) at 560-nm emission [23 (link),27 (link),28 (link)].
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