I know how to measure the concentration of free thiols, which is reflective of the redox-potential of cellular compartment such as the cytoplasm or a lysosomes.
- What other methods exist?
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Electrochemistry; using microelectrodes. So, basically, place one microelectrode inside the cell, and another (the reference electrode) just outside the cell, and then use a potentiostat to measure the potential between them. Reference.