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(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.



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 ?
Exposures to air freshener and fragrance compounds still varied substantially among immigrant subgroups but showed consistency with P results: Higher concentrations of d-limonene (Southeast Asians) and p-dichlorobenzene (Hispanics and Southeast Asians) were observed for some households, and lower levels of the xylenes were observed in Somali residences.
Uedo N, Tatsuta M, Iishi H, Baba M, Sakai N, Yano H, Otani T (1999) Inhibition of d-limonene of gastric carcinogenesis induced by N-methyl-N'-nitro-N-nitrosoguanidine in Wistar rats.
35) reported that aerosol products accounted for 22% of the reacted d-limonene in their ozone/d-limonene experiments, suggesting that these aerosols contained a number of low volatility [C.
The numbers of beetles that chose the 25 [micro]L/L 1:1 D-limonene to terpinolene + apple tree treatment were significantly greater than the numbers of beetles that chose the apple tree + distilled water treatment at 60 min, especially when aphids were present (Fig.
The aim of this study was to encapsulate d-limonene using a spray drying technique to evaluate the influence of different agents with surface active properties (tween 20, tween 60, sodium caseinate and low methoxyl pectin) on some of the quality features of the product obtained and to assess the overall performance of the drying process for the purpose of industrialization.
Biotransformation of d-limonene represents a very attractive alternative for the production of aromas [20], because it takes place under mild conditions, does not generate toxic wastes, and allows production of "natural" aromas that can be used as fragrances and flavors in the industries [21,22].
USPRwire, Wed Aug 28 2013] The report covers the major Green Solvents and Bio Solvents markets including lactate esters, alcohols, glycols, diols, d-limonene, and methyl soyate solvents.
The name sounds as though UA would be toxic, but there are many examples of edible terpenes found in nature, such as D-limonene (also an appetite suppressant), perillyl alcohol (for cancer), and various carotenoids (a-carotene, [beta]-carotene, etc.
Research from the Arizona Cancer Center found that d-limonene, a major component in orange peels, reduces the occurrence of squamous cell carcinoma, a deadly form of skin cancer.
6 (cfc 12) d-limonene 5989-27-5 11 ethanol 64-17-5 980 ethyl acetate 141-78-6 5.
The OSB and gypsum wallboard layers present a major source of formaldehyde, other aldehydes (such as acetaldehyde and hexanal), and terpenes (such as d-limonene and [alpha]-pinene).