The rhizomes are used fresh or boiled in water and dried, after which they are ground into a deep orange-yellow powder commonly used as a coloring and flavoring agent in many Asian cuisines, especially for curries, as well as for the dyeing characteristics imparted by the principal turmeric constituent, curcumin.[6]
The greatest diversity of Curcuma species by number alone is in India, at around 40 to 45 species. Thailand has a comparable 30 to 40 species. Other countries in tropical Asia also have numerous wild species of Curcuma. Recent studies have also shown that the taxonomy of C. longa is problematic, with only the specimens from South India being identifiable as C. longa. The phylogeny, relationships, intraspecific and interspecific variation, and even identity of other species and cultivars in other parts of the world still need to be established and validated. Various species currently utilized and sold as "turmeric" in other parts of Asia have been shown to belong to several physically similar taxa, with overlapping local names.[11][12]
From India, it spread to Southeast Asia along with Hinduism and Buddhism, as the yellow dye is used to color the robes of monks and priests. Turmeric has also been found in Tahiti, Hawaii and Easter Island before European contact.[16] There is linguistic and circumstantial evidence of the spread and use of turmeric by the Austronesian peoples into Oceania and Madagascar. The populations in Polynesia and Micronesia, in particular, never came into contact with India, but use turmeric widely for both food and dye. Thus independent domestication events are also likely.[14][15]
Turmeric was found in Farmana, dating to between 2600 and 2200 BCE, and in a merchant's tomb in Megiddo, Israel, dating from the second millennium BCE.[17] It was noted as a dye plant in the Assyrians' Cuneiform medical texts from Ashurbanipal’s library at Nineveh from 7th century BCE.[16]InMedieval Europe, turmeric was called "Indian saffron."[16]
The name possibly derives from Middle English or Early Modern English as turmeryteortarmaret. It may be of Latin origin, terra merita ("meritorious earth").[18] The Latin specific epithet longa means long.[19]
Turmeric is a perennialherbaceous plant that reaches up to 1 m (3 ft 3 in) tall.[1] It has highly branched, yellow to orange, cylindrical, aromatic rhizomes.[1]
The leaves are alternate and arranged in two rows. They are divided into leaf sheath, petiole, and leaf blade.[1] From the leaf sheaths, a false stem is formed. The petiole is 50 to 115 cm (20–45 in) long. The simple leaf blades are usually 76 to 115 cm (30–45 in) long and rarely up to 230 cm (7 ft 7 in). They have a width of 38 to 45 cm (15 to 17+1⁄2in) and are oblong to elliptical, narrowing at the tip.[1]
At the top of the inflorescence, stem bracts are present on which no flowers occur; these are white to green and sometimes tinged reddish-purple, and the upper ends are tapered.[20]
The hermaphrodite flowers are zygomorphic and threefold. The three sepals are 0.8 to 1.2 cm (3⁄8to1⁄2in) long, fused, and white, and have fluffy hairs; the three calyx teeth are unequal. The three bright-yellow petals are fused into a corolla tube up to 3 cm (1+1⁄4in) long. The three corolla lobes have a length of 1.0 to 1.5 cm (3⁄8–5⁄8in) and are triangular with soft-spiny upper ends. While the average corolla lobe is larger than the two lateral, only the median stamen of the inner circle is fertile. The dust bag is spurred at its base. All other stamens are converted to staminodes. The outer staminodes are shorter than the labellum. The labellum is yellowish, with a yellow ribbon in its center and it is obovate, with a length from 1.2 to 2.0 cm (1⁄2to3⁄4in). Three carpels are under a constant, trilobed ovary adherent, which is sparsely hairy. The fruit capsule opens with three compartments.[21][22]
InEast Asia, the flowering time is usually in August. Terminally on the false stem is an inflorescence stem, 12 to 20 cm (4+1⁄2 to 8 in) long, containing many flowers. The bracts are light green and ovate to oblong with a blunt upper end with a length of 3 to 5 cm (1 to 2 in).[20]
Curcuma domestica Valeton, a drawing by A. Bernecker around 1860
Turmeric is one of the key ingredients in many Asian dishes, imparting a mustard-like, earthy aroma and pungent, slightly bitter flavor to foods.[7][8] It is used mostly in savory dishes, but also is used in some sweet dishes, such as the cake sfouf. In India, turmeric leaf is used to prepare special sweet dishes, patoleo, by layering rice flour and coconut-jaggery mixture on the leaf, then closing and steaming it in a special utensil (chondrõ).[27] Most turmeric is used in the form of rhizome powder to impart a golden yellow color.[7][8] It is used in many products such as canned beverages, baked products, dairy products, ice cream, yogurt, yellow cakes, orange juice, biscuits, popcorn, cereals and sauces. It is a principal ingredient in curry powders.[7][28] Although typically used in its dried, powdered form, turmeric also is used fresh, like ginger.[28]
Turmeric is used widely as a spice in South Asian and Middle Eastern cooking. Various Iraniankhoresh recipes begin with onions caramelized in oil and turmeric. The Moroccan spice mix ras el hanout typically includes turmeric. In South Africa, turmeric is used to give boiled white rice a golden color, known as geelrys (yellow rice) traditionally served with bobotie. In Vietnamese cuisine, turmeric powder is used to color and enhance the flavors of certain dishes, such as bánh xèo, bánh khọt, and mì Quảng. The staple Cambodian curry paste, kroeung, used in many dishes, including fish amok, typically contains fresh turmeric. In Indonesia, turmeric leaves are used for MinangorPadang curry base of Sumatra, such as rendang, sate padang, and many other varieties. In the Philippines, turmeric is used in the preparation and cooking of kuning, satti, and some variants of adobo. In Thailand, fresh turmeric rhizomes are used widely in many dishes, in particular in the southern Thai cuisine, such as yellow curry and turmeric soup. Turmeric is used in a hot drink called "turmeric latte" or "golden milk" that is made with milk, frequently coconut milk.[29] The turmeric milk drink known as haldī dūdh (haldī [हलदी] means turmeric in Hindi) is a traditional Indian recipe. Sold in the US and UK, the drink known as "golden milk" uses nondairy milk and sweetener, and sometimes black pepper after the traditional recipe (which may also use ghee).[29]
In combination with annatto (E160b), turmeric has been used to color numerous food products.[6][28] Turmeric is used to give a yellow color to some prepared mustards, canned chicken broths, and other foods—often as a much cheaper replacement for saffron.[28][30]
Khandoba's newer temple in Jejuri, where devotees shower turmeric powder (bhandara) on each other
In 2019, the European Medicines Agency concluded that turmeric herbal teas, or other forms taken by mouth, on the basis of their long-standing traditional use, could be used to relieve mild digestive problems, such as feelings of fullness and flatulence.[31]
Turmeric grows wild in the forests of South and Southeast Asia, where it is collected for use in classical Indian medicine (Siddha or Ayurveda).[9] In Eastern India, the plant is used as one of the nine components of nabapatrika along with young plantain or banana plant, taro leaves, barley (jayanti), wood apple (bilva), pomegranate (darimba), Saraca indica, manaka (Arum), or manakochu, and rice paddy. The Haldi ceremony called gaye holud in Bengal (literally "yellow on the body") is a ceremony observed during wedding celebrations of people of Indian culture all throughout the Indian subcontinent.[32]
Dry Turmeric at temple for marriage ritual, South India
InTamil Nadu and Andhra Pradesh, as a part of the Tamil–Telugu marriage ritual, dried turmeric tuber tied with string is used to create a Thali necklace. In western and coastal India, during weddings of the Marathi and Konkani people, KannadaBrahmins, turmeric tubers are tied with strings by the couple to their wrists during a ceremony, Kankana Bandhana.[33] In many Hindu communities, turmeric paste is applied to the bride and groom as part of pre-wedding festivities known as the haldi ceremony.[34]
Turmeric makes a poor fabric dye, as it is not light fast, but is commonly used in Indian clothing, such as saris and Buddhist monks' robes.[8] During the late Edo period (1603–1867), turmeric was used to dilute or substitute more expensive safflower dyestuff in the production of beni itajime shibori.[35]: 1 Friedrich Ratzel reported in The History of Mankind during 1896, that in Micronesia, turmeric powder was applied for embellishment of body, clothing, utensils, and ceremonial uses.[36]Native Hawaiians who introduced it to Hawaii (Hawaiian: ʻōlena) make a bright yellow dye out of it.[37]
Turmeric dispersed in water is yellow under acid and red under alkaline conditions
Turmeric paper, also called curcuma paper or in German literature, Curcumapapier, is paper steeped in a tincture of turmeric and allowed to dry. It is used in chemical analysis as an indicator for acidity and alkalinity.[38] The paper is yellow in acidic and neutral solutions and turns brown to reddish-brown in alkaline solutions, with transition between pH of 7.4 and 9.2.[39]
As turmeric and other spices are commonly sold by weight, the potential exists for powders of toxic, cheaper agents with a similar color to be added, such as lead(II,IV) oxide ("red lead"). These additives give turmeric an orange-red color instead of its native gold-yellow, and such conditions led the US Food and Drug Administration (FDA) to issue import alerts from 2013 to 2019 on turmeric originating in India and Bangladesh.[40] Imported into the United States in 2014 were approximately 5.4 million kilograms (12 million pounds) of turmeric, some of which was used for food coloring, traditional medicine, or dietary supplement.[40] Lead detection in turmeric products led to recalls across the United States, Canada, Japan, Korea, and the United Kingdom through 2016.[40]
Lead chromate, a bright yellow chemical compound, was found as an adulterant of turmeric in Bangladesh, where turmeric is used commonly in foods and the contamination levels were up to 500 times higher than the national limit.[41] Researchers identified a chain of sources adulterating the turmeric with lead chromate: from farmers to merchants selling low-grade turmeric roots to "polishers" who added lead chromate for yellow color enhancement, to wholesalers for market distribution, all unaware of the potential consequences of lead toxicity.[41]
Turmeric and curcumin have been studied in numerous clinical trials for various human diseases and conditions, with no high-quality evidence of any anti-disease effect or health benefit.[9][10][43][44] There is no scientific evidence that curcumin reduces inflammation, as of 2020[update].[9][10][45] There is weak evidence that turmeric extracts may be beneficial for relieving symptoms of knee osteoarthritis,[46] as well as for reducing pain and muscle damage following physical exercise.[47] There is good evidence that turmeric is an allergen.[48]
^ abKikusawa, Ritsuko; Reid, Lawrence A. (2007). "Proto who utilized turmeric, and how?"(PDF). In Siegel, Jeff; Lynch, John; Eades, Diana (eds.). Language Description, History and Development: Linguistic indulgence in memory of Terry Crowley. John Benjamins Publishing Company. pp. 339–352. ISBN9789027292940. Archived from the original(PDF) on 25 November 2021. Retrieved 18 January 2019.
^ abMcClatchey, W. (1993). "Traditional use of Curcuma longa (Zingiberaceae) in Rotuma". Economic Botany. 47 (3): 291–296. doi:10.1007/bf02862297. S2CID20513984.
^Hu, Y; Kong, W; Yang, X; et al. (2014). "GC-MS combined with chemometric techniques for the quality control and original discrimination of Curcumae longae rhizome: Analysis of essential oils". Journal of Separation Science. 37 (4): 404–11. doi:10.1002/jssc.201301102. PMID24311554.
^Braga, ME; Leal, PF; Carvalho, JE; Meireles, MA (2003). "Comparison of yield, composition, and antioxidant activity of turmeric (Curcuma longa L.) extracts obtained using various techniques". Journal of Agricultural and Food Chemistry. 51 (22): 6604–11. doi:10.1021/jf0345550. PMID14558784.
^Vaughn, A. R.; Branum, A; Sivamani, RK (2016). "Effects of Turmeric (Curcuma longa) on Skin Health: A Systematic Review of the Clinical Evidence". Phytotherapy Research. 30 (8): 1243–64. doi:10.1002/ptr.5640. PMID27213821. S2CID46429012.
^White CM, Pasupuleti V, Roman YM, et al. (August 2019). "Oral turmeric/curcumin effects on inflammatory markers in chronic inflammatory diseases: A systematic review and meta-analysis of randomized controlled trials". Pharmacol Res (Meta-analysis). 146: 104280. doi:10.1016/j.phrs.2019.104280. PMID31121255. S2CID163166501.
The dictionary definition of turmeric at Wiktionary
