Limonene


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Related to Limonene: linalool, geraniol

limonene

[′lim·nə‚lēn]
(organic chemistry)
C10H16 A terpene with a lemon odor that is optically active and is found in oils from citrus fruits and in oils from peppermint and spearmint; a colorless, water-insoluble liquid that boils at 176°C.

Limonene

 

1-methy1–4-isopropenylcyclohexene-1, a terpene hydrocarbon; colorless liquid with a lemony odor. Oxidizes readily in air. Boiling point, 176°C; density, 0.8411 g/cm3 at 20°C. Limonene exists in two optically active (+) and (-) forms, as well as a (±)-form (racemic mixture) commonly called dipentene.

Limonene is a component of many essential oils. For example, citrus oils contain mainly (+)-limonene (approximately 90 percent), which may be extracted by rectification processes. Dipentene is also found in turpentine. Limonene is used as an odoriferous substance in perfume and cosmetics manufacture.

References in periodicals archive ?
pseudolimon essential oil whereby the main constituents were limonene (47.07%), cuminal (11.41%), eugenol (10.17%), b-pinene (5.23%), styrene glycol (3.49%), -terpinene (3.67%), 3-isobutyl-1-cyclohexene (2.57%), caryophyllene (2.04%), menthene (1.53%), a-pinene (1.01%), p-cumic aldehyde (1.47%), a- isopropylbenzyl alcohol (1.56%), caryophyllene Oxide (1.94%) and Eugenyl acetate (1.29%).
Thereafter, the leaf and berry essential oil compositions from various mediterranean origins have also been investigated such as in Turkey (Ozek et al., 2000), France (Bradesi et al., 1997), Italy (Pirisino et al., 1996), Portugal (Boelens and Jimenez, 1991), Spain (Boelens and Jimenez, 1992), 1,8-cineole (18.3%), linalool (16.3%) and myrtenyl acetate (14.5%), limonene (5.7-43.4% and 6.2-44.2%), 1,8-cineole (5.9-26.6% and 8.7-30.40%), respectively.
Limonene encapsulation in freeze-drying of gum Arabicsucrose-gelatine systems.
Chemotaxis of adult psyllids to volatile terpenes Obviously non significant percentage of female psyllids showed chemotaxis to individual tested terpenes of limonene (P=0.80183) or AY- pinene (P=0.84361) (Table II).
As alternative for limonene epoxide definition in the simulation, the user can choose between: i) using a probe molecule (i.e., camphor ([C.sup.10][H.sup.16]O)) which is available in the software data-bases, or, ii) introducing a "user defined" substance estimating its properties by a group contribution method.
Of the 30 listed compounds, the following had the highest percentages: [alpha]-pinene (20.58% to 10.91%), camphene (22.38% to 2.86%), [beta]-pinene (6.73% to 3.96%), [beta]-myrcene (1.09% to 2.51), [delta]-[beta]-carene (4.36% to 16.77%), [alpha]-terpinene (0.9% to 4.22%), [beta]-phellandrene (0.00% to 13.36%), limonene (20.16% to 0.00%), terpineol (0.33% to 5.35%), and bomyl acetate (9.79% to 0.68%).
The effect of pH on limonene biotransformation was studied by dissolving YM culture medium in a 0.1 M HCl at pH values of 2.5, 4 and 5.5 and also a 0.1 M NaOH at pH values of 7.5, 10 and 12.5.
However, when R-limonene is oxidized, it includes limonene hydroperoxides, which Dr.
haworthi revealed the presence of the monoterpenes [alpha]-pinene, [beta]-pinene, myrcene, and limonene, which were identified by comparison of those of authentic reference samples (Figure 1, Table 1).
Ashraf et al [6] analyzed the dill seed essential oil by GLC and found the oil to be rich in carvone (52.25%), dill apiole (28.28%) and limonene (9.34%).
The chromatographic analysis carried out for the essential oil allowed the identification of citral (neral + geranial isomers) in the AndrE da Rocha population, ledene and caryophyllene in Bom Jardim da Serra and limonene, borneol, 1,3,8-menthatriene and 1,5,8 p-menthatriene in Santa Lucia as major compounds.