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  Redox Potential

Redox Potential:

In reduction and oxidation reactions the free energy exchange is proportionate to the trend of reactants to donate/to accept electrons. The affinity for the electron through the oxidant is known as the electron affinity or redox potential. In biochemistry, the oxygen comprises the highest redox potential/electron affinity (E0) and hence the electron passes from the systems of hydrogen donors that comprise lower potentials. It is general to compare the redox potential of a system (E0) in opposition to the potential of the hydrogen electrode that is at pH 0 designated as 0.0 volts. Though, in a biological system it is general to express the redox potential (E0) at pH 7.0 at which the electrode potential of hydrogen electrode is -0.42volts. In the biological system, the enzymes related with this oxidation reduction processes are entitled as oxidoreductases. Some of the redox potentials are expressed in the below table.

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                                             Table: Some of the redox potential of special interest

For the standard reduction potential the meaning of a positive value is that a compound in question preferentially is reduced while included in a redox reaction with hydrogen. And the meaning of a negative value is that a compound in question is preferentially oxidized. Though, listings of standard reduction potentials are all the time given in the form of a reduction reaction.

 

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