Table of standard reduction potentials for half-reactions important in biochemistry

The values below are standard reduction potentials for half-reactions measured at 25°C, 1 atmosphere and a pH of 7 in aqueous solution.

Half-reaction	Δξ°'(V)
CH₃COOH Acetic acid Acetic acid is an organic compound with the chemical formula CH3CO2H . It is a colourless liquid that when undiluted is also called glacial acetic acid. Acetic acid is the main component of vinegar , and has a distinctive sour taste and pungent smell... + 2 H⁺ + 2 e^- → CH₃CHO Acetaldehyde Acetaldehyde is an organic chemical compound with the formula CH3CHO or MeCHO. It is one of the most important aldehydes, occurring widely in nature and being produced on a large scale industrially. Acetaldehyde occurs naturally in coffee, bread, and ripe fruit, and is produced by plants as part... + H₂O	-0.581
2 H⁺ + 2 e^- → H₂	-0.421
NAD NAD NAD may refer to:* No abnormality detected, a medical status description* No apparent distress, a status description in childbirth* NAD Electronics, a Canadian audio equipment manufacturer... ⁺ + H⁺ + 2 e^- → NADH	-0.320
NADP⁺ + H⁺ + 2 e^- → NADPH	-0.320
FAD FAD In biochemistry, flavin adenine dinucleotide is a redox cofactor involved in several important reactions in metabolism. FAD can exist in two different redox states, which it converts between by accepting or donating electrons. The molecule consists of a riboflavin moiety bound to the phosphate... + 2 H⁺ + 2 e^- → FADH₂ (coenzyme bonded to flavoprotein Flavoprotein Flavoproteins are proteins that contain a nucleic acid derivative of riboflavin: the flavin adenine dinucleotide or flavin mononucleotide .... s)	-0.22
O Oxygen Oxygen is the element with atomic number 8 and represented by the symbol O. Its name derives from the Greek roots ὀξύς and -γενής , because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition... ₂ + 2 H⁺ + 2 e^- → H₂O₂ Hydrogen peroxide Hydrogen peroxide is the simplest peroxide and an oxidizer. Hydrogen peroxide is a clear liquid, slightly more viscous than water. In dilute solution, it appears colorless. With its oxidizing properties, hydrogen peroxide is often used as a bleach or cleaning agent...	+0.7
O₂ + 4 H⁺ + 4 e^- → 2 H₂O	+1.64
P680 P680 P680, or Photosystem II primary donor, refers to any of the 2 special chlorophyll dimers , PD1 or PD2. These 2 special pairs form an excitonic dimer, which means that they behave in function as a single entity; i.e., they are excited as if they were a single molecule... ⁺ + e^- → P680	~ +1.0

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