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alpha-carotene [Supplementary Concept]
RN given refers to (all-E)-isomer; see also related record beta-carotene
Date introduced: July 12, 1984
Cyclohexenes
Six-carbon alicyclic hydrocarbons which contain one or more double bonds in the ring. The cyclohexadienes are not aromatic, in contrast to BENZOQUINONES which are sometimes called 2,5-cyclohexadiene-1,4-diones.
Year introduced: 2007
Terpenes
A class of compounds composed of repeating 5-carbon units of HEMITERPENES.
Polyenes
Hydrocarbons with more than one double bond. They are a reduced form of POLYYNES.
Year introduced: 1974
Pigments, Biological
Any normal or abnormal coloring matter in PLANTS; ANIMALS or micro-organisms.
Year introduced: 2006(1963)
Organic Chemicals
A broad class of substances containing carbon and its derivatives. Many of these chemicals will frequently contain hydrogen with or without oxygen, nitrogen, sulfur, phosphorus, and other elements. They exist in either carbon chain or carbon ring form.
Year introduced: 1998
Hydrocarbons, Cyclic
Organic compounds composed exclusively of carbon and hydrogen forming a closed ring that may be either alicyclic or aromatic.
Hydrocarbons, Alicyclic
Organic compounds composed exclusively of carbon and hydrogen. Three or more carbon atoms are arranged in a cyclic structure and they possess aliphatic properties.
Hydrocarbons, Acyclic
Organic compounds composed exclusively of carbon and hydrogen where no carbon atoms join to form a ring structure.
Hydrocarbons
Organic compounds that primarily contain carbon and hydrogen atoms with the carbon atoms forming a linear or circular structure.
Cycloparaffins
Alicyclic hydrocarbons in which three or more of the carbon atoms in each molecule are united in a ring structure and each of the ring carbon atoms is joined to two hydrogen atoms or alkyl groups. The simplest members are cyclopropane (C3H6), cyclobutane (C4H8), cyclohexane (C6H12), and derivatives of these such as methylcyclohexane (C6H11CH3). (From Sax, et al., Hawley's Condensed Chemical Dictionary, 11th ed)
Cyclohexanes
Six-carbon alicyclic hydrocarbons.
Year introduced: 1975
Carotenoids
The general name for a group of fat-soluble pigments found in green, yellow, and leafy vegetables, and yellow fruits. They are aliphatic hydrocarbons containing 4 terpene subunits.
Year introduced: 1966
Biological Factors
Endogenously synthesized compounds that influence biological processes not otherwise classified under ENZYMES; HORMONES or HORMONE ANTAGONISTS.
Year introduced: 1989
Alkenes
Unsaturated hydrocarbons of the type Cn-H2n, indicated by the suffix -ene. (Grant and Hackh's Chemical Dictionary, 5th ed, p408)