succinic acid

succinic acid

succinic acid: see Krebs cycle.

Succinic acid (IUPAC systematic name: butanedioic acid; historically known as spirit of amber) is a dicarboxylic acid. Succinate plays a biochemical role in the citric acid cycle.

Physical properties

At room temperature, pure succinic acid is a solid that forms colorless, odorless crystals. It has a melting point of 185  °C and a boiling point of 235  °C. It is a diprotic acid. The carboxylate anion is called succinate and esters of succinic acid are called alkyl succinates.

Biochemical role

Succinate is a component of the citric acid cycle and is capable of donating electrons to the electron transfer chain via the following reaction:

succinate + FADfumarate + FADH2

This is catalysed by the enzyme succinate dehydrogenase (or complex II of the mitochondrial ETC). The complex is a 4 subunit membrane-bound lipoprotein which couples the oxidation of succinate to the reduction of ubiquinone. Intermediate electron carriers are FAD and three Fe2S2 clusters part of subunit B.


Spirit of amber was procured from amber by pulverising and distilling it using a sand bath. It was chiefly used externally for rheumatic aches and pains, and internally in inveterate gleets.


The acid is combustible and corrosive, capable of causing burns. "Harmful by inhalation, ingestion and through skin absorption. Wash after handling. Eye contact may cause serious damage."

In nutraceutical form as a food additive and dietary supplement, is safe and approved by the FDA.


Succinic acid can be converted to fumaric acid by oxidation. The diethyl ester is a substrate in the Stobbe condensation.


Succinic acid is created as a byproduct of the fermentation of sugar. It lends to fermented beverages such as wine and beer a common taste that is a combination of saltiness, bitterness and acidity.


See also

External links

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