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Cymbopogon citratus

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Cymbopogon citratus, commonly known as lemon grass or oil grass, is a tropical plant from South Asia and Southeast Asia.

Cymbopogon citratus is often sold in stem form. While it can be grown in warmer temperate regions, such as the UK, it is not hardy to frost.

Contents

Culinary uses

Cymbopogon citratus is abundant in the Philippines and Indonesia where it is known as tanglad or sereh. Its fragrant leaves are traditionally used in cooking, particularly for lechon and roasted chicken.<ref name="tanglad">Template:Cite web</ref>

The dried leaves can also be brewed into a tea, either alone or as a flavoring in other teas, imparting a flavor reminiscent of lemon juice but with a mild sweetness without significant sourness or tartness.

Medicinal uses

Template:Medref The leaves of Cymbopogon citratus have been used in traditional medicine and are often found in herbal supplements and teas. Many effects have been attributed to both their oral consumption and topical use, with modern research supporting many of their alleged benefits.

In the folk medicine of Brazil, it is believed to have anxiolytic, hypnotic, and anticonvulsant properties.<ref>Template:Cite journal</ref><ref>Rodrigues, Eliana & Carlini, E.A. (2006): Plants with possible psychoactive effects used by the Krahô Indians, Brazil. Revista Brasileira de Psiquiatria 28(4): 277-282. PDF fulltext </ref>

In traditional medicine of India the leaves of the plant are used as stimulant, sudorific, antiperiodic, and anticatarrhal, while the essential oil is used as carminative, depressant, analgesic, antipyretic, antibacterial, and antifungal agent.

Laboratory studies have shown cytoprotective, antioxidant, and anti-inflammatory properties in vitro,<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal<ref>Template:Cite journal</ref> (though Cymbopogon martinii was found to be more effective in that study).

Citronellol is an essential oil constituent from Cymbopogon citratus, Cymbopogon winterianus, and Lippia alba. Citronellol has been shown to lower blood pressure in rats by a direct effect on the vascular smooth muscle leading to vasodilation.<ref>Template:Cite journal</ref> In a small, randomized, controlled trial, an infusion made from C. citratus was used as an inexpensive remedy for the treatment of oral thrush in HIV/AIDS patients.<ref>Template:Cite journal</ref>

Lemon grass oil contains 65-85% citral in addition to myrcene, citronella, citronellol, and geraniol.<ref>Template:Cite book</ref> Hydrosteam distillation, condensation, and cooling can be used to separate the oil from the water. The hydrosol, as a by-product of the distillation process, is used for the production of skin care products such as lotions, creams, and facial cleansers. The main ingredients in these products are lemon grass oil and "negros oil" (mixture of lemon grass oil with virgin coconut oil) used in aromatherapy.<ref>Inquirer.net, ‘Tanglad’ goes mainstream, yields essential oils</ref>

Pharmacology

One low-dose study found no effect of Cymbopogon citratus essential oils on humans.<ref>Template:Cite journal</ref> However, subsequent research has demonstrated that the plants essential oil enhances GABA-ergic neurotranssmision at sufficient doses (with an anxiolytic threshold dose of 10 mg/kg) via positive allosteric agonism in the same manner as benzodiazepines (ex. diazepam) which are used clinically as anxiolytics, sedative/hypnotics, muscle relaxants, and anticonvulsants.<ref>Template:Cite journal</ref> Despite the observed pharmacological activity, the average adult male would require 600–800 mg of the pure essential oil to achieve a clinically significant reduction in anxiety. Most commercial supplements contain doses far below the threshold dose which suggests that the majority of lemongrass supplements exert their anxiolytic benefits either primarily or entirely through the induction of the placebo effect. As the essential oil was demonstrated to act synergistically with other GABA-ergics (even in sub-therapeutic doses) and likely also potentiates anxiolytics of other mechanisms (as predicted by the mechanics of benzodiazepines), the possibility of pharmacologically-induced anxiolysis cannot be eliminated when formulations containing a sub-therapeutic lemongrass dosage also contain other anxiolytic herbs/chemicals.

Effect on insects

Video tracking of a stable fly, demonstrating repellency of lemongrass oil <ref name="Baldacchino">Template:Cite journal</ref>

Beekeepers sometimes use lemon grass oil in swarm traps to attract swarms. Lemon grass oil has also been tested for its ability to repel the pestilent stable fly,<ref name="Baldacchino" /> which bite domestic animals.

See also

References

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External links

  • This page was last modified on 18 February 2016, at 08:18.
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