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Caryophyllene

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Caryophyllene
Names
Preferred IUPAC name
(1R,4E,9S)-4,11,11-Trimethyl-8-methylidenebicyclo[7.2.0]undec-4-ene
Other names
β-Caryophyllene
trans-(1R,9S)-8-Methylene-4,11,11-trimethylbicyclo[7.2.0]undec-4-ene
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.001.588 Edit this at Wikidata
UNII
  • InChI=1S/C15H24/c1-11-6-5-7-12(2)13-10-15(3,4)14(13)9-8-11/h6,13-14H,2,5,7-10H2,1,3-4H3/b11-6+/t13-,14-/m1/s1 checkY
    Key: NPNUFJAVOOONJE-GFUGXAQUSA-N checkY
  • InChI=1/C15H24/c1-11-6-5-7-12(2)13-10-15(3,4)14(13)9-8-11/h6,13-14H,2,5,7-10H2,1,3-4H3/b11-6+/t13-,14-/m1/s1
    Key: NPNUFJAVOOONJE-GFUGXAQUBC
  • C1(=C)\CC/C=C(/CC[C@@H]2[C@@H]1CC2(C)C)C
Properties
C15H24
Molar mass 204.357 g·mol−1
Density 0.9052 g/cm3 (17 °C)[1]
Boiling point 262–264 °C (504–507 °F; 535–537 K)[2]
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 ?)

Caryophyllene (/ˌkærioʊˈfɪliːn/), more formally (−)-β-caryophyllene, (BCP), is a natural bicyclic sesquiterpene that is a constituent of many essential oils, especially clove oil, the oil from the stems and flowers of Syzygium aromaticum (cloves),[3] the essential oil of Cannabis sativa, copaiba, rosemary,[4] and hops.[5] It is usually found as a mixture with isocaryophyllene (the cis double bond isomer) and α-humulene (obsolete name: α-caryophyllene), a ring-opened isomer. Caryophyllene is notable for having a cyclobutane ring, as well as a trans-double bond in a 9-membered ring, both rarities in nature.

Caryophyllene is one of the chemical compounds that contributes to the aroma of black pepper.[6]

Pharmacology

β-Caryophyllene acts as a full agonist of the Cannabinoid receptor type 2 (CB2 receptor) in rats.[7] β-Caryophyllene has a binding affinity of Ki = 155nM at the CB2 receptors in mice.[8] β-Caryophyllene has been shown to have anti-inflammatory action linked to its CB2 receptor activity in a study comparing the pain killing effects in mice with and without CB2 receptors with the group of mice without CB2 receptors seeing little benefit compared to the mice with functional CB2 receptors.[7] β-Caryophyllene has the highest cannabinoid activity compared to the ring opened isomer α-caryophyllene Humulene which may modulate CB2 activity.[9] To compare binding, Cannabinol (CBN) binds to the CB2 receptors as a partial agonist with an affinity of CB2 Ki = 126.4 nM[10] while Delta-9-Tetrahydrocannabinol binds to the CB2 receptors as a partial agonist with an affinity of Ki = 36nM.[11]

Caryophyllene helps to improve cold tolerance at low ambient temperatures. Wild giant pandas frequently roll in horse manure, which contains beta-caryophyllene/caryophyllene oxide, to inhibit transient receptor potential melastatin 8 (TRPM8), an archetypical cold-activated ion channel of mammals.[12]

ß-caryophyllene could be efficiently used in the fight against cancer. For example, in an in vitro human colorectal adenocarcinoma study β-caryophyllene used alone did not inhibited cancer cell growth, but a combination of β-caryophyllene 10 µg/mL−1 and Paclitaxel 0.025 µg/mL−1 resulted in 189% cancer cell growth inhibition (compared to Paclitaxel used alone).[13]

Safety

Caryophyllene has been given GRAS (generally regarded as safe) designation by the FDA and is approved by the FDA for use as a food additive, typically for flavoring.[14][15] Rats given up to 700mg/kg daily for 90 days did not produce any significant toxic effects [16] Caryophyllene has an LD50 of 5,000mg/kg in mice[17][18]

Chemistry

The first total synthesis of caryophyllene in 1964 by E. J. Corey was considered one of the classic demonstrations of the possibilities of synthetic organic chemistry at the time.[19]

Metabolism and derivatives

14-Hydroxycaryophyllene oxide (C15H24O2) was isolated from the urine of rabbits treated with (−)-caryophyllene (C15H24). The X-ray crystal structure of 14-hydroxycaryophyllene (as its acetate derivative) has been reported.[20]

The metabolism of caryophyllene progresses through (−)-caryophyllene oxide (C15H24O) since the latter compound also afforded 14-hydroxycaryophyllene (C15H24O) as a metabolite.[21]

Caryophyllene (C15H24) → caryophyllene oxide (C15H24O) → 14-hydroxycaryophyllene (C15H24O) → 14-hydroxycaryophyllene oxide (C15H24O2).

Caryophyllene oxide,[22] in which the alkene group of caryophyllene has become an epoxide, is the component responsible for cannabis identification by drug-sniffing dogs[23][24] and is also an approved food additive, often as flavoring.[15] Caryophyllene oxide does not have any Cannabinoid activity like Beta-Caryophyllene itself.

Natural sources

The approximate quantity of caryophyllene in the essential oil of each source is given in square brackets ([ ]):

Biosynthesis

Caryophyllene is a common sesquiterpene among plant species. It is biosynthesized from the common terpene precursors dimethylallyl pyrophosphate (DMAPP) and isopentenyl pyrophosphate (IPP). First, single units of DMAPP and IPP are reacted via an SN1-type reaction with the loss of pyrophosphate, catalyzed by the enzyme GPPS2, to form geranyl pyrophosphate (GPP). This further reacts with a second unit of IPP, also via an SN1-type reaction catalyzed by the enzyme IspA, to form farnesyl pyrophosphate (FPP). Finally, FPP undergoes QHS1 enzyme-catalyzed intramolecular cyclization to form caryophyllene.[41]

Biosynthesis of caryophyllene

Compendial status

Notes and references

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  4. ^ a b Ormeño, E.; Baldy, V.; Ballini, C.; Fernández, C. (September 2008). "Production and diversity of volatile terpenes from plants on calcareous and siliceous soils: effect of soil nutrients". Journal of Chemical Ecology. 34 (9): 1219–1229. doi:10.1007/s10886-008-9515-2. PMID 18670820. S2CID 28717342.
  5. ^ Tinseth, G. (January–February 1993). "Hop Aroma and Flavor". Brewing Techniques. Retrieved July 21, 2010.
  6. ^ a b Jirovetz, L.; Buchbauer, G.; Ngassoum, M. B.; Geissler, M. (November 2002). "Aroma compound analysis of Piper nigrum and Piper guineense essential oils from Cameroon using solid-phase microextraction–gas chromatography, solid-phase microextraction–gas chromatography–mass spectrometry and olfactometry". Journal of Chromatography A. 976 (1–2): 265–275. doi:10.1016/S0021-9673(02)00376-X. PMID 12462618.
  7. ^ a b Ceccarelli, Ilaria; Fiorenzani, Paolo; Pessina, Federica; Pinassi, Jessica; Aglianò, Margherita; Miragliotta, Vincenzo; Aloisi, Anna Maria (18 August 2020). "The CB2 Agonist β-Caryophyllene in Male and Female Rats Exposed to a Model of Persistent Inflammatory Pain". Frontiers in Neuroscience. 14: 850. doi:10.3389/fnins.2020.00850. PMC 7461959. PMID 33013287.
  8. ^ Alberti, Thaís Barbosa; Barbosa, Wagner Luiz Ramos; Vieira, José Luiz Fernandes; Raposo, Nádia Rezende Barbosa; Dutra, Rafael Cypriano (1 April 2017). "(−)-β-Caryophyllene, a CB2 Receptor-Selective Phytocannabinoid, Suppresses Motor Paralysis and Neuroinflammation in a Murine Model of Multiple Sclerosis". International Journal of Molecular Sciences. 18 (4): 691. doi:10.3390/ijms18040691. PMC 5412277. PMID 28368293.
  9. ^ Hashiesh, Hebaallah Mamdouh; Sharma, Charu; Goyal, Sameer N.; Sadek, Bassem; Jha, Niraj Kumar; Kaabi, Juma Al; Ojha, Shreesh (1 August 2021). "A focused review on CB2 receptor-selective pharmacological properties and therapeutic potential of β-caryophyllene, a dietary cannabinoid". Biomedicine & Pharmacotherapy. 140: 111639. doi:10.1016/j.biopha.2021.111639. PMID 34091179. S2CID 235362290.
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  12. ^ Zhou, Wenliang; Yang, Shilong; Li, Bowen; Nie, Yonggang; Luo, Anna; Huang, Guangping; Liu, Xuefeng; Lai, Ren; Wei, Fuwen (22 December 2020). "Why wild giant pandas frequently roll in horse manure". Proceedings of the National Academy of Sciences. 117 (51): 32493–32498. Bibcode:2020PNAS..11732493Z. doi:10.1073/pnas.2004640117. PMC 7768701. PMID 33288697.
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