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Limonene (/ ˈ l ɪ m ə n ˌ iː n /) is a colorless liquid aliphatic hydrocarbon classified as a cyclic monoterpene, and is the major component in the essential oil of citrus fruit peels. [1] The (+)- isomer , occurring more commonly in nature as the fragrance of oranges, is a flavoring agent in food manufacturing.
Perillyl alcohol and its precursor limonene are naturally occurring monocyclic terpenes derived from the mevalonate pathway in plants. Perillyl alcohol can be found in the essential oils of various plants, such as lavender, lemongrass, sage, and peppermint. [1] It has a number of manufacturing, household, and medical applications.
A 2013 study found that "Based on adverse effects and risk assessments, d-limonene may be regarded as a safe ingredient. However, the potential occurrence of skin irritation necessitates regulation of this chemical as an ingredient in cosmetics."
However, it is a commonly held misconception that (+)-limonene is found in oranges (causing its smell), and (–)-limonene is found in lemons (causing its smell). In 2021, after rigorous experimentation, it was found that all citrus fruits contain only (+)-limonene and the odor difference is because of other contributing factors. [28]
Linalool can be absorbed by inhalation of its aerosol and by oral intake or skin absorption, potentially causing irritation, pain and allergic reactions. [ 3 ] [ 19 ] Some 7% of people undergoing patch testing in Europe were found to be allergic to the oxidized form of linalool.
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Research also indicates that the d-limonene in orange oil can be useful in exterminating drywood termites (Incisitermes). [8] Orange oil is used as a green pesticide for biological pest control, as it is effective against ants and other insects by disrupting their scent-pheromone trails or dissolving their exoskeletons, thereby preventing ...
D-Limonene, a terpene. Solvents in a diverse class of natural substances called terpenes are obtained by extraction from certain parts of plants. All terpenes are structurally presented as multiples of isoprene with the gross formula (C 5 H 8) n. D-limonene, a monoterpene, is one of the best known solvents in this class, as is turpentine.