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m Published magnetic susceptibility from the CRC 64th, handbook of chemistry and physics in the physical properties section.
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== Uses ==
== Uses ==


Geranial has a strong lemon odor. Neral's lemon odor 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 [[antimicrobial]] qualities,<ref>{{cite journal | author = Onawunmi, G.O. |year=1989 | title=Evaluation of the antimicrobial activity of citral |journal=Lett. Appl. Microbial. | volume=9 |pages=105–108 | doi = 10.1111/j.1472-765X.1989.tb00301.x | issue = 3}}</ref> and pheromonal effects in insects.<ref>{{cite journal | author = Kuwahara, Y., Suzuki, H., Matsumoto, K. & Wada, Y. |year=1983 |title=Pheromone study on acarid mites. XI. Function of mite body as geometrical isomerization and reduction of citral (the alarm pheromone) Carpoglyphus lactis |journal=Appl. Entomol. Zool. |volume=18 |pages=30–39}}</ref><ref>{{cite journal |author1=Robacker, D.C. |author2=Hendry, L.B. |year=1977 |title=Neral and geranial: components of the sex pheromone of the parasitic wasp, Itoplectis conquisitor | journal=J. Chem. Ecol. |volume=3 |pages=563–577 | doi = 10.1007/BF00989077 | issue = 5}}</ref>
Geranial has a strong lemon (citrus) odor. Neral's lemon odor 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 [[antimicrobial]] qualities,<ref>{{cite journal | author = Onawunmi, G.O. |year=1989 | title=Evaluation of the antimicrobial activity of citral |journal=Lett. Appl. Microbial. | volume=9 |pages=105–108 | doi = 10.1111/j.1472-765X.1989.tb00301.x | issue = 3}}</ref> and pheromonal effects in insects.<ref>{{cite journal | author = Kuwahara, Y., Suzuki, H., Matsumoto, K. & Wada, Y. |year=1983 |title=Pheromone study on acarid mites. XI. Function of mite body as geometrical isomerization and reduction of citral (the alarm pheromone) Carpoglyphus lactis |journal=Appl. Entomol. Zool. |volume=18 |pages=30–39}}</ref><ref>{{cite journal |author1=Robacker, D.C. |author2=Hendry, L.B. |year=1977 |title=Neral and geranial: components of the sex pheromone of the parasitic wasp, Itoplectis conquisitor | journal=J. Chem. Ecol. |volume=3 |pages=563–577 | doi = 10.1007/BF00989077 | issue = 5}}</ref>


Citral is used in the synthesis of [[vitamin A]], [[ionone]], and methylionone, to mask the smell of smoke.
Citral is used in the synthesis of [[vitamin A]], [[ionone]], and methylionone, to mask the smell of smoke.

Revision as of 06:07, 28 March 2017

Citral[1]
Skeletal formula of geranial
Geranial
Ball-and-stick model of the geranial molecule
Skeletal formula of neral
Neral
Ball-and-stick model of the neral molecule
Names
IUPAC name
3,7-dimethylocta-2,6-dienal
Other names
citral
geranialdehyde
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.023.994 Edit this at Wikidata
KEGG
RTECS number
  • RG5075000
UNII
  • InChI=1S/C10H16O/c1-9(2)5-4-6-10(3)7-8-11/h5,7-8H,4,6H2,1-3H3/b10-7+ checkY
    Key: WTEVQBCEXWBHNA-JXMROGBWSA-N checkY
  • InChI=1/C10H16O/c1-9(2)5-4-6-10(3)7-8-11/h5,7-8H,4,6H2,1-3H3/b10-7+
    Key: WTEVQBCEXWBHNA-JXMROGBWBB
  • O=CC=C(C)CCC=C(C)C
  • O=C/C=C(/CC/C=C(/C)C)C
Properties
C10H16O
Molar mass 152.24 g/mol
Appearance Pale yellow liquid
Odor Lemon like
Density 0.893 g/cm3
Boiling point 229 °C (444 °F; 502 K)
Vapor pressure 0.22 mmHg (20 °C)
-98.9·10−6 cm3/mol
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 0: Exposure under fire conditions would offer no hazard beyond that of ordinary combustible material. E.g. sodium chlorideFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
0
1
0
Flash point 91 °C (196 °F; 364 K)
Related compounds
Related alkenals
 Citronellal

Methacrolein
trans-2-Methyl-2-butenal

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Citral, or 3,7-dimethyl-2,6-octadienal or lemonal, is either a pair, or a mixture 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.

Occurrence

Citral is present in the oils of several plants, including lemon myrtle (90-98%), Litsea citrata (90%), Litsea cubeba (70-85%), lemongrass (65-85%), lemon tea-tree (70-80%), Ocimum gratissimum (66.5%), Lindera citriodora (about 65%), Calypranthes parriculata (about 62%), petitgrain (36%), lemon verbena (30-35%), lemon ironbark (26%), lemon balm (11%), lime (6-9%), lemon (2-5%), and orange.[2][3][4]

Uses

Geranial has a strong lemon (citrus) odor. Neral's lemon odor 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 antimicrobial qualities,[5] and pheromonal effects in insects.[6][7]

Citral is used in the synthesis of vitamin A, ionone, and methylionone, to mask the smell of smoke.

Health and safety information

Two studies have shown 1-1.7% of people to be allergic to citral, and allergies are frequently reported. Citral on its own is strongly sensitizing to allergies; the International Fragrance Association recommends that citral only be used in association with substances that prevent a sensitizing effect. Citral has been extensively tested and has no known genotoxicity, and no known carcinogenic effect, but animal tests show dose-dependent effects on the kidneys.[8]

See also

References

  1. ^ Citral, The Merck Index, 12th Edition.
  2. ^ Fenaroli, G., Furia, T.E., Bellanca, N., Handbook of Flavor Ingredients, ISBN 0-87819-532-7
  3. ^ Lawless, J., The Illustrated Encyclopedia of Essential Oils, ISBN 1-85230-661-0
  4. ^ The Aromatic Plant Project
  5. ^ Onawunmi, G.O. (1989). "Evaluation of the antimicrobial activity of citral". Lett. Appl. Microbial. 9 (3): 105–108. doi:10.1111/j.1472-765X.1989.tb00301.x.
  6. ^ Kuwahara, Y., Suzuki, H., Matsumoto, K. & Wada, Y. (1983). "Pheromone study on acarid mites. XI. Function of mite body as geometrical isomerization and reduction of citral (the alarm pheromone) Carpoglyphus lactis". Appl. Entomol. Zool. 18: 30–39.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  7. ^ Robacker, D.C.; Hendry, L.B. (1977). "Neral and geranial: components of the sex pheromone of the parasitic wasp, Itoplectis conquisitor". J. Chem. Ecol. 3 (5): 563–577. doi:10.1007/BF00989077.
  8. ^ Survey and health assessment of chemical substances in massage oils

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