Citral, or 3,7-dimethyl-2,6-octadienal or lemonal, is either of a pair of terpenoids with the molecular formula C10H16O. The two compounds are double bond isomers. The E-isomer is known as geranial or citral A. The Z-isomer is known as neral or citral B.
Geranial has a strong lemon odor. Neral has a lemon odor that is less intense, but sweeter. Citral is therefore an aroma compound used in perfumery for its citrus effect. Citral is also used as a flavor and for fortifying lemon oil. It also has strong anti-microbial qualities, and pheromonal effects in insects.
Citral is used in the synthesis of vitamin A, ionone, and methylionone, and to mask the smell of smoke.
Citral is present in the oils of several plants, including lemon myrtle (90-98%), Listsea citrata (90%), Litsea cubeba (70-85%), lemongrass (65-85%), lemon tea-tree (70-80%), Ocimum gratissimum (66.5%), Lindera citriodora (approx. 65%), Calypranthes parriculata (approx. 62%), petitgrain (36%), Lemon verbena (30-35%), Lemon ironbark (26%), lemon balm (11%), lime (6-9%), lemon (2-5%), and orange.
Health & Safety information
Citral should be avoided by people with perfume allergy.See also
References
Footnotes
General references
- MSDS
External links
This article is licensed under the GNU Free Documentation License.
Last updated on Tuesday October 07, 2008 at 15:48:48 PDT (GMT -0700)
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