Cathinone
 | |
 | |
| Clinical data | |
|---|---|
| ATC code |
|
| Legal status | |
| Legal status |
|
| Pharmacokinetic data | |
| Elimination half-life | 0.7–2.3 h[2] |
| Identifiers | |
| |
JSmol) | |
| |
| |
  (what is this?) (verify) | |
Cathinone (.
History
Discovery
Khat has been cultivated in the Horn of Africa and Arabian Peninsula region of the world for thousands of years. It is most commonly chewed for the euphoric effect it produces. The active ingredient was first proposed in 1930, when cathine was identified as a predominant alkaloid in the plant.[3] Cathine was thought to be the main active ingredient in khat until the 1960s, when it was found that the amount of cathine in the khat leaves is insufficient to produce the effects observed. In 1975, the United Nations Narcotic Laboratory analyzed khat leaves from Yemen, Kenya and Madagascar and found the presence of a different alkaloid, cathinone.[3] Cathinone is a similar molecule to cathine, but is much more abundant in younger plants. This finding caused scientists to speculate about whether cathinone was the true active ingredient in khat.[3]
A study was conducted in 1994 to test the effects of cathinone. Six volunteers who had never chewed khat were given an active khat sample and a cathinone-free placebo sample.[4] The researchers analyzed the participants' moods, activity levels and blood pressure before and after consuming the khat or placebo. This analysis showed that cathinone produced amphetamine-like symptoms, leading the researchers to confirm that cathinone, not cathine, is the active ingredient in khat leaves.[4]
Cultural significance
Over 20 million people in the Arabian Peninsula and East Africa chew khat leaves daily. It is an important piece of the culture and economy in this region, especially in Ethiopia (where khat is said to have originated), Kenya, Djibouti, Somalia and Yemen. Men usually chew it during parties or other social gatherings while smoking cigarettes and drinking tea. Farmers and other workers also use khat in the afternoon to reduce fatigue and hunger as the day goes on. It functions like the caffeine in a strong cup of coffee as an anti-fatigue drug. Students and drivers have been known to use it to stay alert for longer periods of time.[5]
In order to produce its desired effects, khat leaves should be chewed fresh. The fresh leaves have a higher concentration of cathinone. Waiting too long after cultivation to chew the leaf will allow the cathinone to break down into its less potent form, cathine. Because of the need for quick chewing, it is a habit that has historically been prevalent only where the plant grows. However, in the recent years with improvements in road and air transport, khat chewing has spread to all corners of the world.
The cultivation of khat in Yemen is a highly profitable industry for farmers. Khat plants will grow differently depending on the climate they are grown in and each one will produce different amounts of cathinone.[6] It generally grows best in coastal, hot climates. In Yemen, the khat plant is named after the region in which it is grown. The Nehmi khat plant has the highest known concentration of cathinone, 342.5 mg/100 g.[6]
Legality
Internationally, cathinone is a Schedule I drug under the Convention on Psychotropic Substances.[7] Circa 1993, the DEA added cathinone to the Controlled Substances Act's Schedule I.
The sale of khat is legal in some jurisdictions, but illegal in others (see Khat (Regulation)). Substituted cathinones were also often used as the key ingredient of recreational drug mixes commonly known as "bath salts" in the United States.[8][9][10][11]
The table below shows the legality of khat and cathinone in various countries:
| Region | Regulation |
|---|---|
| Eritrea | Legal |
| Ethiopia | Legal |
| Somalia | Legal |
| Djibouti | Legal |
| Kenya | Khat is legal but cathinone and cathine are classified as Class C substances |
| South Africa | Khat is a protected plant |
| China | Illegal |
| Israel | Legal – The khat plant leaves are allowed to be chewed and beverages containing khat are legal, but it is illegal to sell pills based on cathinone extracts |
| Malaysia | Illegal |
| Saudi Arabia | Illegal |
| Yemen | Khat is legal but the cultivation and selling of the plant is regulated by the government |
| Denmark | Illegal |
| Finland | Illegal |
| France | Khat is prohibited as a stimulant |
| Germany | Khat is illegal but a derivative of cathinone is available upon prescription |
| Ireland | Illegal unless authorized |
| Netherlands | Cathinone and cathine have been illegal but khat was announced as illegal in 2012 |
| Norway | Illegal |
| Poland | Illegal |
| Sweden | Illegal |
| Switzerland | Illegal |
| United Kingdom | Illegal |
| Canada | Illegal to obtain unless approved by a medical practitioner |
| United States | Illegal |
| Australia | Illegal |
| New Zealand | Illegal |
| Georgia | The khat plant itself is allowed to be sold and chewed, but it is illegal to sell or make beverages containing khat |
| Bulgaria | Illegal under List I - "Plants and substances with a high risk to the public health due to their harmful effect of misuse, prohibited for use in human and veterinary medicine"[12] |
Biological effects
Mechanism of action
Cathinone has been found to stimulate the release of
The metabolites of cathinone, cathine and norephedrine, also possess CNS stimulation, but create much weaker effects.
Cathinone can also affect cholinergic concentrations in the gut and airways by blocking prejunctional
Pharmacology
Khat leaves are removed from the plant stalk and are kept in a ball in the cheek and chewed. Chewing releases juices from the leaves, which include the alkaloid cathinone. The absorption of cathinone has two phases: one in the
Effects on health
The first documentation of the khat plant being used in medicine was in a book published by an Arabian physician in the 10th century.[6] It was used as an antidepressant because it led to feelings of happiness and excitement. Chronic khat chewing can also create drug dependence, as shown by animal studies.[6] In such studies, monkeys were trained to push a lever to receive the drug reward. As the monkeys' dependence increased, they pressed the lever at an increasing frequency.[6]
Khat chewing and the effects of cathinone on the body differ from person to person, but there is a general pattern of behavior that emerges after ingesting fresh cathinone:[6]
- Feelings of euphoria that last for one to two hours
- Discussion of serious issues and increased irritability
- Very active imagination
- Depression
- Irritability, loss of appetite and insomnia
There are other effects not related to the CNS. The chewer can develop
Chemistry
Biosynthesis
The synthesis of cathinone in khat begins with L-
Aside from the beta- and non-beta-oxidative pathways, the biosynthesis of cathinone can proceed through a CoA-dependent pathway. The CoA-dependent pathway is actually a mix between the two main pathways as it starts like the beta-oxidative pathway and then when it loses CoA, it finishes the synthesis in the non-beta-oxidative pathway. In this pathway, the trans-cinnamic acid produced from L-phenylalanine is ligated to a Coenzyme A (CoA), just like the beginning of the beta-oxidative pathway.[16] It then undergoes hydration at the double bond. This product then loses the CoA to produce benzaldehyde, an intermediate of the non-beta-oxidative pathway. Benzaldehyde is converted into benzoic acid and proceeds through the rest of the synthesis.[16]
Synthetic production
Cathinone can be synthetically produced from propiophenone through a
Structure
Cathinone can be extracted from
The structure of cathinone is very similar to that of other molecules. By reducing the ketone, it becomes cathine if it retains its stereochemistry, or norephedrine if its stereochemistry is inverted. Cathine is a less potent version of cathinone and cathinone's spontaneous reduction is the reason that older khat plants are not as stimulating as younger ones. Cathinone and amphetamine are closely related in that amphetamine is only lacking the ketone C=O group.[18] Cathinone is structurally related to methcathinone, in much the same way as amphetamine is related to methamphetamine. Cathinone differs from amphetamine by possessing a ketone oxygen atom (C=O) on the β (beta) position of the side chain. The corresponding alcohol, cathine, is a less powerful stimulant. The biophysiological conversion from cathinone to cathine is to blame for the depotentiation of khat leaves over time. Fresh leaves have a greater ratio of cathinone to cathine than dried ones, therefore having more psychoactive effects.
There are many cathinone derivatives that include the addition of an R group to the amino end of the molecule. Some of these derivatives have medical uses as well. Bupropion is one of the most commonly prescribed antidepressants and its structure is Cathinone with a tertiary butyl group attached to the nitrogen and chlorine attached to the benzene ring meta- to the main carbon chain.[18]
Other cathinone derivatives are strong psychoactive drugs. One such drug is methylone, a drug structurally similar to MDMA.
See also
References
- ^ Anvisa (2023-07-24). "RDC Nº 804 - Listas de Substâncias Entorpecentes, Psicotrópicas, Precursoras e Outras sob Controle Especial" [Collegiate Board Resolution No. 804 - Lists of Narcotic, Psychotropic, Precursor, and Other Substances under Special Control] (in Brazilian Portuguese). Diário Oficial da União (published 2023-07-25). Archived from the original on 2023-08-27. Retrieved 2023-08-27.
- PMID 12848785.
- ^ PMID 12858935.
- ^ S2CID 25788465.
- ^ Kirby A (7 April 2007). "Yemen's khat habit soaks up water". BBC News. BBC. Archived from the original on 12 October 2014. Retrieved 20 March 2015.
- ^ S2CID 9749292.
- ^ "List of psychotropic substances under international control" (PDF). International Narcotics Control Board. United Nations. 2003. Archived from the original (PDF) on 2012-08-31.
- ^ "Synthetic Street Drug Camouflaged as Bath Salts Has Dangerous, Bizarre Effects". PBS NewsHour. 20 September 2012. Archived from the original on 29 December 2012. Retrieved 7 December 2013.
- ^ Urquhart C (4 September 2004). "Drugs and dance as Israelis blot out intifada". The Guardian. Archived from the original on 8 November 2016. Retrieved 19 April 2015.
- ^ Chai C (16 April 2015). "What you need to know about flakka, the latest drug causing erratic behaviour". Globalnews.ca. Archived from the original on 20 April 2015. Retrieved 19 April 2015.
- ^ Extance A. "The rising tide of 'legal highs'". Chemistry World. Retrieved 3 August 2018.
- ^ "НАРЕДБА за реда за класифициране на растенията и веществата като наркотични" [REGULATION on the procedure for classifying plants and substances as narcotic] (PDF). Ministry of Health (in Bulgarian). Republic of Bulgaria. Archived (PDF) from the original on 2017-08-27. Retrieved 2017-08-26.
- ^ a b c d e Hugins KB (17 July 2014). "Cathinone: History, Synthesis, and Human Applications". slideshare. Archived from the original on 4 July 2015. Retrieved 8 March 2015.
- S2CID 20621923.
- ^ a b "Cathinone". Drug Bank. Archived from the original on 23 April 2015. Retrieved 10 March 2015.
- ^ PMID 22215969.
- ^ Shulgin A (7 December 2005). "4-Hydroxy-5-methoxy-N,N-dimethyltryptamine, Psilocybe mushrooms, Psilocin". Ask Dr. Shulgin Online. Archived from the original on 7 September 2013. Retrieved 10 September 2013.
- ^ a b "Synthetic cathinones drug profile". European Monitoring Center for Drugs and Drug Addiction. EMCDDA. Archived from the original on 17 March 2015. Retrieved 8 March 2015.