BIOC 2580 Lecture Notes - Lecture 29: Glutathione, Ferricyanide, Salt Bridge
1 Oct 2015
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Consult your first-year chemistry textbook and your biochemistry textbook for further explanation. Oxidation and reduction reactions must occur together (reaction (i)), however it is easier to consider the two halves separately when describing electron transfers (reaction (ii) and (iii)). The electron donating molecule in an oxidation reduction reaction (bred) is called the reducing agent or reductant; the electron accepting molecule (aox) is the oxidizing agent or oxidant. We can determine this by comparing the standard reduction potential (e0 ) of the two half reactions. E0 = standard reduction potential at ph 7 and 250c. Biochemists use the transformed standard reduction potential (e0 ), as the standard state in biochemistry is defined as ph 7 (similar to the definition of g0 ). Measuring the standard reduction potential of half reactions (e0 ) Redox potentials can be measured with an electrochemical cell apparatus. Each cell mediates one of the half-reactions, and the electrons pass between the cells through a wire.
