Redox potential

• Redox potential (Eh) is a measure of a chemical species’ tendency to gain (reduction) or lose (oxidation) electrons, crucial in biochemical energy transfer and electron transport processes.

Basics of Redox Potential

1. Definition:

   • Indicates a molecule’s ability to accept (oxidizing agent) or donate (reducing agent) electrons.

2. Expression:

   • Measured in volts (V) or millivolts (mV) relative to the standard hydrogen electrode (SHE).

3. Interpretation:

   • Higher Eh → Stronger oxidizing agent (electron acceptor).
   • Lower Eh → Stronger reducing agent (electron donor).

Biological Significance of Redox potential

1. Energy Transfer: Drives electron flow in processes like photosynthesis and respiration.
2. Electron Transport Chain: Facilitates ATP generation via stepwise redox reactions.
3. Metabolic Regulation: Regulates pathways to optimize energy use.

Environmental Influence on Redox Potential

1. pH: Proton concentration affects electron transfer.
2. Temperature: Influences reaction kinetics and potential.
3. Reactant Concentration: Availability shifts equilibrium, impacting Eh.

Importance of Redox Potentials

• Predictive Value: It helps predict the direction and spontaneity of redox reactions.
• Energetics and Feasibility: They determine whether reactions are energetically favorable.
• Biochemical Pathways: Understanding potentials is key to deciphering metabolic pathways and energy management in living organisms. Top of Form Bottom of Form

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