From Bioblast
Description
FCCP (Carbonyl cyanide p-trifluoro-methoxyphenyl hydrazone, C10H5F3N4O) is a protonophore or uncoupler: added at uncoupler concentration Uc; c is the optimum uncoupler concentration in titrations to obtain maximum mitochondrial respiration in the noncoupled state of ET capacity.
Abbreviation: FCCP
Reference: Steinlechner-Maran 1996 Am J Physiol Cell Physiol, Gnaiger_2008_POS
MitoPedia topics:
Uncoupler
CCCP versus FCCP
- Bioblast alert 2013(02): We replace FCCP by the less expensive and equally effective CCCP in our experiments with high-resultion respirometry (HRR).
Application in HRFR
- FCCP (Carbonyl cyanide 4-(trifluoromethoxy)phenylhydrazone, C10H5F3N4O); Sigma C 2920, 10 mg, store at 4 Β°C: FW = 254.17)
- Caution: Toxic!
- Preparation of 1 mM stock solution (dissolved in 99.9% ethanol):
- 1. Weigh 1.27 mg of FCCP into a glass vial.
- 2. Dissolve in 5 ml ethanol.
- 3. Divide into 0.2 ml portions, or store in 5 ml glass vial and use subsamples during experiments to avoid contamination of the storage solution.
- 4. Store in glass vials at -20 Β°C.
- Caution: Chemicals stored in the fridge or freezer should be allowed to reach room temperature before opening.
- O2k manual titrations MiPNet09.12 O2k-Titrations
- Titration volume: 1 Β΅l (or 0.5 Β΅l) steps using a 10 Β΅l syringe (2 ml O2k-Chamber).
- Final concentration: 0.5 Β΅M (or 0.25 Β΅M) steps.
- Frequently, a more diluted FCCP stock is necessary for reducing the concentration steps in manual titrations. In this case prepare more diluted stocksolution (ditution 2-10x) from your storage solution. The highest accuracy of uncoupler titrations is achieved by titrations with the TIP2k at high concentrations of the stock solution. [1]
- β Gnaiger E (2008) Polarographic oxygen sensors, the oxygraph and high-resolution respirometry to assess mitochondrial function. In: Mitochondrial dysfunction in drug-induced toxicity (Dykens JA, Will Y, eds) John Wiley:327-52. Β»Bioblast linkΒ«