Cloves are the aromatic flower buds of a tree in the family

Myrtaceae Myrtaceae, the myrtle family, is a family of dicotyledonous plants placed within the order Myrtales. Myrtle, pōhutukawa, bay rum tree, clove, guava, acca (feijoa), allspice, and eucalyptus are some notable members of this group. All speci ...

, ''Syzygium aromaticum'' (). They are native to the Maluku Islands (or Moluccas) in Indonesia, and are commonly used as a spice, flavoring or fragrance in consumer products, such as toothpaste, soaps, or cosmetics. Cloves are available throughout the year owing to different harvest seasons across various countries.

Etymology

The word ''clove'', first used in English in the

15th century The 15th century was the century which spans the Julian dates from 1 January 1401 ( MCDI) to 31 December 1500 ( MD). In Europe, the 15th century includes parts of the Late Middle Ages, the Early Renaissance, and the early modern period. M ...

, derives via Middle English ''clow of gilofer'', Anglo-French ''clowes de gilofre'' and Old French ''clou de girofle'', from the Latin word ''clavus'' "nail". The related English word ''gillyflower'', originally meaning "clove", derives via said Old French ''girofle'' and Latin ''caryophyllon'', from the Greek ''karyophyllon'' "clove", literally "nut leaf".

Botanical features

The clove tree is an evergreen that grows up to tall, with large leaves and

crimson Crimson is a rich, deep red color, inclining to purple. It originally meant the color of the kermes dye produced from a scale insect, ''Kermes vermilio'', but the name is now sometimes also used as a generic term for slightly bluish-red colo ...

flowers grouped in terminal clusters. The flower buds initially have a pale hue, gradually turn green, then transition to a bright red when ready for harvest. Cloves are harvested at long, and consist of a long

calyx Calyx or calyce (plural "calyces"), from the Latin ''calix'' which itself comes from the Ancient Greek ''κάλυξ'' (''kálux'') meaning "husk" or "pod", may refer to: Biology * Calyx (anatomy), collective name for several cup-like structures ...

that terminates in four spreading sepals, and four unopened petals that form a small central ball.

Uses

The flowers of clove tree in Pemba island

Cloves are used in the cuisine of

Asian Asian may refer to: * Items from or related to the continent of Asia: ** Asian people, people in or descending from Asia ** Asian culture, the culture of the people from Asia ** Asian cuisine, food based on the style of food of the people from Asi ...

African African or Africans may refer to: * Anything from or pertaining to the continent of Africa: ** People who are native to Africa, descendants of natives of Africa, or individuals who trace their ancestry to indigenous inhabitants of Africa *** Ethn ...

, Mediterranean, and the Near and Middle East countries, lending flavor to meats (such as baked ham), curries, and marinades, as well as fruit (such as apples, pears, and

rhubarb Rhubarb is the fleshy, edible stalks ( petioles) of species and hybrids (culinary rhubarb) of ''Rheum'' in the family Polygonaceae, which are cooked and used for food. The whole plant – a herbaceous perennial growing from short, thick rhizo ...

). Cloves may be used to give aromatic and flavor qualities to hot beverages, often combined with other ingredients such as lemon and sugar. They are a common element in spice blends, including pumpkin pie spice and

speculaas Speculaas (, , , , ) is a type of spiced shortcrust biscuit baked with speculaas spices. Speculaas is usually flat in the shape of a picture and is especially popular around the feast of St. Nicholas and during the time of Advent. The oldest ...

spices. In

Mexican cuisine Mexican cuisine consists of the cooking cuisines and traditions of the modern country of Mexico. Its earliest roots lie in Mesoamerican cuisine. Its ingredients and methods begin with the first agricultural communities such as the Olmec and M ...

, cloves are best known as ''clavos de olor'', and often accompany

cumin Cumin ( or , or Article title
) (''Cuminum cyminum'') is a

cinnamon Cinnamon is a spice obtained from the inner bark of several tree species from the genus ''Cinnamomum''. Cinnamon is used mainly as an aromatic condiment and flavouring additive in a wide variety of cuisines, sweet and savoury dishes, breakfa ...

. They are also used in Peruvian cuisine, in a wide variety of dishes such as ''

carapulcra Carapulcra, or carapulca, is an ancient Andean dish that has been prepared for centuries by both Quechua peoples and Aymara peoples. The original term for this dish in the Aymara language is , which means a stew made with hot stones. In contempor ...

'' and '' arroz con leche''. A major component of clove taste is imparted by the chemical

eugenol Eugenol is an allyl chain-substituted guaiacol, a member of the allylbenzene class of chemical compounds. It is a colorless to pale yellow, aromatic oily liquid extracted from certain essential oils especially from clove, nutmeg, cinnamon, basil ...

, and the quantity of the spice required is typically small. It pairs well with cinnamon,

allspice Allspice, also known as Jamaica pepper, myrtle pepper, pimenta, or pimento, is the dried unripe berry (botany), berry of ''Pimenta dioica'', a Canopy (forest), midcanopy tree native to the Greater Antilles, southern Mexico, and Central America, ...

, vanilla,

red wine Red wine is a type of wine made from dark-colored grape varieties. The color of the wine can range from intense violet, typical of young wines, through to brick red for mature wines and brown for older red wines. The juice from most purple grap ...

, basil, onion, citrus peel,

star anise ''Illicium verum'' is a medium-sized evergreen tree native to northeast Vietnam and southwest China. A spice commonly called star anise, staranise, star anise seed, star aniseed, star of anise, Chinese star anise, or badian that closely resembl ...

, and peppercorns.

Non-culinary uses

The spice is used in a type of cigarette called ''

kretek Kretek () are unfiltered cigarettes of Indonesian origin, made with a blend of tobacco, cloves, and other flavors. The word "kretek" itself is an onomatopoetic term for the crackling sound of burning cloves. Partly due to favorable taxation ...

'' in Indonesia. Clove cigarettes were smoked throughout Europe, Asia, and the United States. Clove cigarettes are currently classified in the United States as

cigar A cigar is a rolled bundle of dried and fermented tobacco leaves made to be smoked. Cigars are produced in a variety of sizes and shapes. Since the 20th century, almost all cigars are made of three distinct components: the filler, the binder l ...

s, the result of a

ban Ban, or BAN, may refer to: Law * Ban (law), a decree that prohibits something, sometimes a form of censorship, being denied from entering or using the place/item ** Imperial ban (''Reichsacht''), a form of outlawry in the medieval Holy Roman ...

of flavored cigarettes in September 2009. Clove

essential oil An essential oil is a concentrated hydrophobic liquid containing volatile (easily evaporated at normal temperatures) chemical compounds from plants. Essential oils are also known as volatile oils, ethereal oils, aetheroleum, or simply as the o ...

may be used to inhibit mold growth on various types of foods. In addition to these non-culinary uses of clove, it can be used to protect wood in a system for

cultural heritage Cultural heritage is the heritage of tangible and intangible heritage assets of a group or society that is inherited from past generations. Not all heritages of past generations are "heritage"; rather, heritage is a product of selection by soci ...

conservation, and showed the efficacy of clove essential oil to be higher than a

boron Boron is a chemical element with the symbol B and atomic number 5. In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder. As the lightest element of the ''boron group'' it has th ...

based wood preservative. Cloves can be used to make a fragrant

pomander A pomander, from French ''pomme d'ambre'', i.e., apple of amber, is a ball made for perfumes, such as ambergris (hence the name), musk, or civet. The pomander was worn or carried in a vase, also known by the same name, as a protection against in ...

when combined with an orange. When given as a gift in Victorian England, such a pomander indicated warmth of feeling. Seasonal clove buds drying on Pemba1

Potential medicinal uses and adverse effects

Use of clove for any medicinal purpose has not been approved by the US Food and Drug Administration, and its use may cause adverse effects if taken orally by people with liver disease, blood clotting and immune system disorders, or food allergies. Cloves are used in traditional medicine as the

, which is used as an anodyne (

analgesic An analgesic drug, also called simply an analgesic (American English), analgaesic (British English), pain reliever, or painkiller, is any member of the group of drugs used to achieve relief from pain (that is, analgesia or pain management). It ...

) mainly for dental emergencies and other disorders. There is evidence that clove oil containing

is effective for toothache pain and other types of pain, and one review reported efficacy of eugenol combined with zinc oxide as an

for

alveolar osteitis Alveolar osteitis, also known as dry socket, is inflammation of the alveolar bone (i.e., the alveolar process of the maxilla or mandible). Classically, this occurs as a postoperative complication of tooth extraction. Alveolar osteitis usually occ ...

. Clove essential oil may prevent the growth of Enterococcus faecalis bacteria which is often present in a root canal treatment failure. Studies to determine its effectiveness for fever reduction, as a mosquito repellent, and to prevent premature ejaculation have been inconclusive. It remains unproven whether blood sugar levels are reduced by cloves or clove oil. The essential oil may be used in aromatherapy.

Adulteration

''Clove stalks'' are slender stems of the inflorescence axis that show opposite

decussate Decussation is used in biological contexts to describe a crossing (due to the shape of the Roman numeral for ten, an uppercase 'X' (), ). In Latin anatomical terms, the form is used, e.g. . Similarly, the anatomical term chiasma is named aft ...

branching. Externally, they are brownish, rough, and irregularly wrinkled longitudinally with short fracture and dry, woody texture. ''Mother cloves (anthophylli)'' are the ripe fruits of cloves that are ovoid, brown berries,

unilocular A locule (plural locules) or loculus (plural loculi) (meaning "little place" in Latin) is a small cavity or compartment within an organ or part of an organism (animal, plant, or fungus). In angiosperms (flowering plants), the term ''locule'' usu ...

and one-seeded. ''Blown cloves'' are expanded flowers from which both corollae and stamens have been detached. ''Exhausted cloves'' have most or all the oil removed by distillation. They yield no oil and are darker in color.

History

Austronesian maritime trade network in the Indian Ocean

Until the colonial era, cloves only grew on a few islands in the Moluccas (historically called the Spice Islands), including

Bacan The Bacan Islands, formerly also known as the Bachans, Bachians, and Batchians, are a group of islands in the Moluccas in Indonesia. They are mountainous and forested, lying south of Ternate and southwest of Halmahera. The islands are administe ...

, Makian, Moti, Ternate, and Tidore. One clove tree named ''Afo'' that experts believe is the oldest in the world on Ternate may be 350–400 years old. Cloves were first traded by the Austronesian peoples in the

Austronesian maritime trade network A trade route is a logistical network identified as a series of pathways and stoppages used for the commercial transport of cargo. The term can also be used to refer to trade over bodies of water. Allowing goods to reach distant markets, a sing ...

(which began at around 1500 BC, later becoming the Maritime Silk Road and part of the Spice Trade). The first notable example of modern clove farming developed on the east coast of Madagascar, and is cultivated in three separate ways, a monoculture, agricultural parklands, and

agroforestry Agroforestry is a land use management system in which trees or shrubs are grown around or among crops or pastureland. Trees produce a wide range of useful and marketable products from fruits/nuts, medicines, wood products, etc. This intentional ...

systems. Archaeologist Giorgio Buccellati found cloves in Terqa, Syria, in a burned-down house which was dated to 1720 BC. This was the first evidence of cloves being used in the west before Roman times. The discovery was first reported in 1978. They reached Rome by the first century AD. Another archeological find of a clove is represented by two examples found at a trading port in

Sri Lanka Sri Lanka (, ; si, ශ්‍රී ලංකා, Śrī Laṅkā, translit-std=ISO (); ta, இலங்கை, Ilaṅkai, translit-std=ISO ()), formerly known as Ceylon and officially the Democratic Socialist Republic of Sri Lanka, is an ...

, dated to around 900–1100 AD. From Chinese records during the Song Dynasty (960 to 1279 AD), cloves were primarily exported from the Moluccas by ships originating from the Austronesian polities of Java,

Srivijaya Srivijaya ( id, Sriwijaya) was a Buddhist thalassocratic empire based on the island of Sumatra (in modern-day Indonesia), which influenced much of Southeast Asia. Srivijaya was an important centre for the expansion of Buddhism from the 7th t ...

Champa Champa (Cham: ꨌꩌꨛꨩ; km, ចាម្ប៉ា; vi, Chiêm Thành or ) were a collection of independent Cham polities that extended across the coast of what is contemporary central and southern Vietnam from approximately the 2nd cen ...

, and Butuan. Cloves were also present in records in

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...

, Southern India, Persia, and Oman by around the third century to second century BC. These mentions of "cloves" reported in China, South Asia, and the Middle East come from before the establishment of Southeast Asian maritime trade. But all of these are misidentifications that referred to other plants (like cassia buds,

, or nutmeg); or are imports from Maritime Southeast Asia mistakenly identified as being natively produced in these regions. During the colonial era, cloves were traded like oil, with an enforced limit on exportation. As the Dutch East India Company consolidated its control of the spice trade in the 17th century, they sought to gain a monopoly in cloves as they had in nutmeg. However, "unlike nutmeg and mace, which were limited to the minute Bandas, clove trees grew all over the Moluccas, and the trade in cloves was beyond the limited policing powers of the corporation." Tourists are told that seedlings from this very tree were stolen by a Frenchman named

Pierre Poivre Pierre Poivre (23 August 1719 – 6 January 1786) was an 18th-century horticulturist and botanist. He was born in Lyon, France. He was a missionary to East Asia, intendant of French colonial islands in the Indian Ocean, and wearer of the cordon ...

in 1770, transferred to the Isle de France ( Mauritius), and then later to Zanzibar, which was once the world's largest producer of cloves. Current leaders in clove production are Indonesia, Madagascar, Tanzania,

, and

Comoros The Comoros,, ' officially the Union of the Comoros,; ar, الاتحاد القمري ' is an independent country made up of three islands in southeastern Africa, located at the northern end of the Mozambique Channel in the Indian Ocean. It ...

. Indonesia is the largest clove producer, but only export a small portion of the cloves they produce, which amounts to around 10-15% of the country's clove production. They oftentimes have to import cloves from Madagascar to meet their needs.

Phytochemicals

Eugenol Eugenol is an allyl chain-substituted guaiacol, a member of the allylbenzene class of chemical compounds. It is a colorless to pale yellow, aromatic oily liquid extracted from certain essential oils especially from clove, nutmeg, cinnamon, basil ...

comprises 72–90% of the essential oil extracted from cloves, and is the compound most responsible for clove aroma. Complete

extract An extract is a substance made by extracting a part of a raw material, often by using a solvent such as ethanol, oil or water. Extracts may be sold as tinctures, absolutes or in powder form. The aromatic principles of many spices, nuts, h ...

ion occurs at 80 minutes in pressurized water at . Ultrasound-assisted and microwave-assisted extraction methods provide more rapid extraction rates with lower energy costs. Other

phytochemical Phytochemicals are chemical compounds produced by plants, generally to help them resist fungi, bacteria and plant virus infections, and also consumption by insects and other animals. The name comes . Some phytochemicals have been used as poisons ...

s of clove oil include acetyl eugenol, beta- caryophyllene, vanillin,

crategolic acid Maslinic acid is a compound derived from dry olive-pomace oil (an olive skin wax) which is a byproduct of olive oil extraction. It is a member of the group of triterpenes known as oleananes. Pharmacology ''In vitro'' study shows that maslinic aci ...

, tannins, such as bicornin, gallotannic acid, methyl salicylate, the

flavonoid Flavonoids (or bioflavonoids; from the Latin word ''flavus'', meaning yellow, their color in nature) are a class of polyphenolic secondary metabolites found in plants, and thus commonly consumed in the diets of humans. Chemically, flavonoids ...

eugenin Eugenin is a chromone derivative, a phenolic compound found in cloves. It is also one of the compounds responsible for bitterness in carrots. Derivatives * 6-Hydroxymethyleugenin can be isolated from the fungal species '' Chaetomium minut ...

, kaempferol, rhamnetin, and

eugenitin Eugenitin is a chromone derivative, a type of phenolic compound found in cloves. It has also been isolated from the fungal species '' Cylindrocarpon'' sp. C.M.I. 127996. Synthesis Eugenitin has also synthethised using the Kostanecki sodium ace ...

, tri terpenoids such as oleanolic acid, stigmasterol, and campesterol and several sesquiterpenes. Although eugenol has not been classified for its potential toxicity, it was shown to be toxic to test organisms in concentrations of 50, 75, and 100 mg per liter.

Gallery

File:Djarum-blacks-kretek.jpg,

Kretek Kretek () are unfiltered cigarettes of Indonesian origin, made with a blend of tobacco, cloves, and other flavors. The word "kretek" itself is an onomatopoetic term for the crackling sound of burning cloves. Partly due to favorable taxation ...

, clove cigarette popular in Indonesia. File:Orange pomander.jpg, Cloves used in an orange as a pomander

References

External links

* {{Authority control aromaticum Spices Flora of the Maluku Islands Plants used in Ayurveda Plants used in traditional Chinese medicine Non-timber forest products Indian spices