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Acmella oleracea
Acmella oleracea inflorescence
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Genus: Acmella
Species: A. oleracea
Binomial name
Acmella oleracea
(L.) R.K.Jansen

Acmella oleracea, also known under its old names Spilanthes oleracea and Spilanthes acmella, is a flowering herb in the plant family Asteraceae, also known as toothache plant or paracress as the leaves and flower heads contain an analgesic agent spilanthol used to numb toothache. It is native to the tropics of Brazil, and is grown as an ornamental (and occasionally as a medicinal) in various parts of the world. A small, erect plant, it grows quickly and sends up gold and red flower inflorescences. It is frost-sensitive but perennial in warmer climates.

Contents

Culinary uses

For culinary purposes, small amounts of shredded fresh leaves add a unique flavour to salads. Cooked leaves lose their strong flavour and may be used as leafy greens. Both fresh and cooked leaves are used in dishes (such as stews) in Northern parts of Brazil, specially in the state of Pará, often combined with chillies and garlic to add flavor and vitamins to other foods.[1] A related species is used in several Southeast Asian dishes, such as salads. Consumption of portions or whole flowers have been reportedly used to offset the intense heat of chillies and peppers.

Eating a whole flower bud results in a grassy taste, followed by an extremely strong tingling or numbing sensation and often excessive saliva production and a cooling sensation in the throat.[1] These buds are known as Buzz Buttons, Szechuan buttons, sansho buttons, and electric buttons.[2] In India, the buds are used as flavoring in chewing tobacco.[2]

Medical uses and effects

A decoction or infusion of the leaves and flowers is a traditional remedy for stammering, toothache, stomatitis, [1] and throat complaints.

However, acmella oleracea extract has been tested against various yeasts and bacteria and was essentially inactive.[3]

Acmella oleracea has been shown to have a strong diuretic action in rats.[4]

Active chemicals

The most important taste-active molecules present are the alkylamides and especially, (2E,6Z,8E)-deca-2,6,8-trienoic acid N-isobutyl amide or spilanthol,

Spilanthol

which is responsible for the trigeminal and saliva-inducing effects of products such as Jambu oleoresin, a concentrated extract from Paracress.[5]

Besides the main active ingredient spilanthol, Acmella also contains stigmasteryl-3-O-b-D-glucopyranoside and a mixture of triterpenes.

The isolation and total synthesis of the active ingredients have been reported.[6]

Pesticide effects

Extracts using hexane of freshly harvested flowers of S. acmella were bioassayed against Aedes aegypti (yellow fever mosquito) larvae and Helicoverpa zea (the corn earworm moth) neonates. Spilanthol proved effective at killing mosquitos, with an LD100 (at 24 hours) at a concentration of 12.5 µg/mL and showed 50% mortality at 6.25 µg/mL.

The mixture of isomers of spilanthol showed a 66% weight reduction of H. zea neonate larvae at 250 µg/mL concentration after 6 days.[5]

References

  1. ^ a b c Like a Taste That Tingles? Then This Bud's for You. Washington Post.
  2. ^ a b It's Shocking, But You Eat It. NPR.
  3. ^ Holetz FB, Pessini GL, Sanches NR, Cortez DA, Nakamura CV, Filho BP (2002). "Screening of some plants used in the Brazilian folk medicine for the treatment of infectious diseases". Mem. Inst. Oswaldo Cruz 97 (7): 1027–31. doi:10.1590/S0074-02762002000700017. PMID 12471432.  
  4. ^ Ratnasooriya WD, Pieris KP, Samaratunga U, Jayakody JR (2004). "Diuretic activity of Spilanthes acmella flowers in rats". Journal of ethnopharmacology 91 (2-3): 317–20. doi:10.1016/j.jep.2004.01.006. PMID 15120455.  
  5. ^ a b Ramsewak RS, Erickson AJ, Nair MG (1999). "Bioactive N-isobutylamides from the flower buds of Spilanthes acmella". Phytochemistry 51 (6): 729–32. doi:10.1016/S0031-9422(99)00101-6. PMID 10389272.  
  6. ^ Ley JP, Blings M, Krammer G, Reinders G, Schmidt CO, Bertram HJ (2006). "Isolation and synthesis of acmellonate, a new unsaturated long chain 2-ketol ester from Spilanthes acmella". Nat. Prod. Res. 20 (9): 798–804. doi:10.1080/14786410500246733. PMID 16753916.  

External links

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Wikispecies

Up to date as of January 23, 2010

From Wikispecies

Taxonavigation

Classification System: APG II (down to family level)

Main Page
Cladus: Eukaryota
Regnum: Plantae
Cladus: Angiospermae
Cladus: Eudicots
Cladus: core eudicots
Cladus: Asterids
Cladus: Euasterids II
Ordo: Asterales
Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Heliantheae
Subtribus: Unassigned
Genus: Acmella
Species: Acmella oleracea

Name

Acmella oleracea (L.) R.K.Jansen

References

  • Systematic Botany Monographs; Monographic Series of the American Society of Plant Taxonomists 8:65. 1985
  • USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN) [Online Database]. [1]

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