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Alpinia nigra

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Template:Italic title Template:Taxobox Alpinia nigra (synonyms Alpinia allughas Retz. and Zingiber nigrum Gaertn.) is a medium-sized herb belonging to the ginger family. The rhizome is well known in many Asian cultures as a medicinal and culinary item. In many Asian tribal communities it is a part of the diet along with rice.

It is endemic to south-east Asia including Bhutan, China, India, Thailand, Bangladesh, Burma and Sri Lanka. In India it is found mainly in the hillocks and riversides of northeastern states such as Assam, Mizoram and Tripura.

Contents

Description

A. nigra is a biennial herbaceous plant. It is morphologically characterized by the presence of a rhizome, simple, wide-brim leaves protected by showy bracts, and terminal inflorescences.<ref>Template:Cite journal</ref> It has a soft, leafy stem about 1.5–3 m high. Leaves are sessile or subsessile, elongated and pointed at the end. Its leaves are single cotyledons, shaped to look like a pike, about 7–9 cm wide, and about 20–40 cm long. The fruit is a berry having many seeds, and the pericarp is thin and green when it is young, becoming black and brittle when it gets old.<ref name="Roy">Template:Cite journal</ref>

Chemical constituents

The major chemical contents are alkaloids, flavonoids, phenols and terpenoids.<ref>Template:Cite journal</ref> The rhizome yields 0.05% essential oil; of which the chief compounds are: 23.0% caryophyllene oxide, 19.9% geraniol, 19.4% eudesmool and 16.5% citronellyl OAc. Important compounds isolated from the seed cluster are kaempferol-3-O-glucoside (astragalin, I), kaempferol-3-O-glucuronide (II), heptatriacontanoic acid 2, 3-dihydroxypropyl ester (III), heptatriacontanoic acid 1, 3-dihydroxypropyl ester (IV) and pentatriacontanoic acid 1, 3-dihydroxypropyl ester (V).<ref>Template:Cite journal</ref> In addition, two major volatile oils, β-pinene and α-pinene have also been isolated from the fruits and rhizomes. From the seed clusters two bioactive flavone glycosides were isolated, astragalin and kaempferol-3-O-glucuronide; and kaempferol-3-O-glucuronide was found to be a dominant compound which was distributed primarily in the pulp.<ref>Template:Cite journal</ref> The chemical 1,8-cineole is the major component in the leaf essential oil (25.4%) and rhizome oil (34%). In addition, β-pinene (15.1%), camphor (15.3%), carotol (7.3%), α-pinene (7.8%) and camphene (7.0%) were also present in leaf oil, whereas in the rhizome oil α-fenchyl acetate (13.1%), α-terpineol (9.6%), β-pinene (8.1%) and camphene (7.0%) were the other main constituents.<ref>Template:Cite journal</ref>

Uses

Food

The inner portion of the aerial parts (pith) is cooked as a vegetable and used in curry for flavouring. The root is used for seasoning.

Medicine

The rhizome is used as an aphrodisiac, tonic, diuretic, expectorant, appetizer and analgesic. It is also used in the treatment of impotence and bronchitis.

In most tribal communities the root pounded and mixed with rice whisky is applied to skin for fungal infections, such as ringworm and melasma. The boiled green root is a potent carminative to reduce flatulence or dyspepsia. A root extract is taken thrice daily for the treatment of gastric ulcers, and taken twice daily for the treatment of jaundice by the Chakmas. Its use as an antiinflammatory and analgesic agent has been supported by experiments in mice.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>

The rhizome, cooked or raw, has been traditionally acclaimed as a remedy for intestinal infections among the Mizo tribes of north-east India. Experimentally the crude extract was shown to be highly effective against the trematode Fasciolopsis buski.<ref name="Roy" /><ref>Template:Cite journal</ref>

References

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External links

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  • This page was last modified on 27 July 2015, at 10:31.
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