Terpenoid

The terpenoids (/ˈtɜːrpɪnɔɪd/ TUR-pin-oyd), sometimes called isoprenoids, are a large and diverse class of naturally occurring organic chemicals derived from the 5-carbon compound isoprene, and the isoprene polymers called terpenes. Most are multicyclic structures with oxygen-containing functional groups. About 60% of known natural products are terpenoids.[1] Although sometimes used interchangeably with "terpenes", terpenoids contain additional functional groups, usually O-containing.[2] Terpenes are hydrocarbons.

Chemical structure of the terpenoid taxol, an anticancer drug.

Plant terpenoids are used for their aromatic qualities and play a role in traditional herbal remedies. Terpenoids contribute to the scent of eucalyptus, the flavors of cinnamon, cloves, and ginger, the yellow color in sunflowers, and the red color in tomatoes.[3] Well-known terpenoids include citral, menthol, camphor, salvinorin A in the plant Salvia divinorum, the cannabinoids found in cannabis, ginkgolide and bilobalide found in Ginkgo biloba, and the curcuminoids found in turmeric and mustard seed.

The steroids and sterols in animals are biologically produced from terpenoid precursors. Sometimes terpenoids are added to proteins, e.g., to enhance their attachment to the cell membrane; this is known as isoprenylation.

Terpineols are monoterpenoids.
Humulones are classified as sesquiterpenoids.
Retinol is a diterpenoid.

Structure and classification

Terpenoids are modified terpenes, wherein methyl groups have been moved or removed, or oxygen atoms added. (Some authors use the term "terpene" more broadly, to include the terpenoids.) Just like terpenes, the terpenoids can be classified according to the number of isoprene units that comprise the parent terpene:

Terpenoids can also be classified according to the number of cyclic structures they contain. The Salkowski test can be used to identify the presence of terpenoids.[4]

Biosynthesis

Terpenoids, at least those containing an alcohol functional group, often arise by hydrolysis of carbocationic intermediates produced from geranyl pyrophosphate. Analogously hydrolysis of intermediates from farnesyl pyrophosphate gives sesquiterpenoids, and hydrolysis of intermediates from geranylgeranyl pyrophosphate gives diterpenoids, etc.[5]

gollark: No, I mean to judge who wrote some code, it's important to have a decent working knowledge of that language, right?
gollark: There's also an important meta-level point about how when people *complained* about palaiologos's choice, they did not decide to actually discuss the merits of it with the community and have a productive discussion but just insist they were right and run a nonsensical vote.
gollark: Python is very simple and most people can sort of write it ish.
gollark: But if we allowed *any* language, you'd somewhat lock people out if they did not know *one* of them.
gollark: Yes it is. If we used different languages it would probably not work very well.

See also

References
  1. Firn R (2010). Nature's Chemicals. Oxford: Biology.
  2. Chemistry, International Union of Pure and Applied. IUPAC Compendium of Chemical Terminology. IUPAC. doi:10.1351/goldbook.T06279.
  3. Specter M (September 28, 2009). "A Life of Its Own". The New Yorker.
  4. Ayoola GA (2008). "Phytochemical Screening and Antioxidant Activities of Some Selected Medicinal Plants Used for Malaria Therapy in Southwestern Nigeria". Tropical Journal of Pharmaceutical Research. 7 (3): 1019–1024. doi:10.4314/tjpr.v7i3.14686.
  5. Davis, Edward M.; Croteau, Rodney (2000). "Cyclization Enzymes in the Biosynthesis of Monoterpenes, Sesquiterpenes, and Diterpenes". Topics in Current Chemistry. 209: 53–95. doi:10.1007/3-540-48146-X_2. ISBN 978-3-540-66573-1.CS1 maint: uses authors parameter (link)
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