The kola nut (
Yoruba: ''obi'',
Dagbani
Dagbani (or Dagbane), also known as Dagbanli or Dagbanle, is a Gur language spoken in Ghana and Northern Togo. Its native speakers are estimated around 1,170,000. Dagbani is the most widely spoken language in northern Ghana, specifically among ...
: ''guli'',
Hausa: goro,
Igbo: ''ọjị'',
Sängö: ''gôro,''
Swahili: ''mukezu'') is the seed of certain species of plant of the genus
''Cola'', placed formerly in the
cocoa family
Sterculiaceae
Sterculiaceae was a family of flowering plant based on the genus '' Sterculia''. Genera formerly included in Sterculiaceae are now placed in the family Malvaceae, in the subfamilies: Byttnerioideae, Dombeyoideae, Helicteroideae and Sterculioide ...
and now usually subsumed in the mallow family
Malvaceae
Malvaceae (), or the mallows, is a family of flowering plants estimated to contain 244 genera with 4225 known species. Well-known members of economic importance include Theobroma cacao, cacao, Cola (plant), cola, cotton, okra, Hibiscus sabdariffa, ...
(as subfamily
Sterculioideae
Sterculioideae is a subfamily of the family (biology), family Malvaceae containing evergreen and deciduous tree and shrub genera, that were previously placed in the obsolete family Sterculiaceae.
Taxonomy
A 2006 molecular study indicated the Ste ...
). These
cola
Cola is a Carbonation, carbonated soft drink flavored with vanilla, cinnamon, citrus essential oil, oils, and other flavorings. Cola became popular worldwide after the American pharmacist John Stith Pemberton invented Coca-Cola, a trademarked br ...
species are
tree
In botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, e.g., including only woody plants with secondary growth, only ...
s native to the tropical
rainforest
Rainforests are forests characterized by a closed and continuous tree Canopy (biology), canopy, moisture-dependent vegetation, the presence of epiphytes and lianas and the absence of wildfire. Rainforests can be generally classified as tropi ...
s of
Africa
Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surfac ...
. Their
caffeine
Caffeine is a central nervous system (CNS) stimulant of the methylxanthine chemical classification, class and is the most commonly consumed Psychoactive drug, psychoactive substance globally. It is mainly used for its eugeroic (wakefulness pr ...
-containing seeds are used as flavoring ingredients in various
carbonated soft drinks, from which the name ''cola'' originates.
Description
About across, the kola nut is a nut of evergreen trees of the genus ''
Cola
Cola is a Carbonation, carbonated soft drink flavored with vanilla, cinnamon, citrus essential oil, oils, and other flavorings. Cola became popular worldwide after the American pharmacist John Stith Pemberton invented Coca-Cola, a trademarked br ...
'', primarily of the species ''
Cola acuminata
''Cola acuminata'' is a species in the genus ''Cola'', of the family Malvaceae, native to tropical Africa. It is generally known for its fruit, the kola nut, originally used to impart the cola flavor in manufactured beverages, such as Coca-Col ...
'' and ''
Cola nitida''.
''Cola acuminata'', an evergreen tree about 20 meters in height, has long, ovoid leaves pointed at both the ends with a leathery texture. The trees have cream-white flowers with purplish-brown striations, and star-shaped fruit consisting of usually 5
follicles. Inside each follicle, about a dozen prismatic seeds develop in a white seed-shell. The nut has a reddish or white color flesh on the inside, and has a sweet and rose-like aroma.
Kola nuts contain about 2–4%
caffeine
Caffeine is a central nervous system (CNS) stimulant of the methylxanthine chemical classification, class and is the most commonly consumed Psychoactive drug, psychoactive substance globally. It is mainly used for its eugeroic (wakefulness pr ...
and
theobromine
Theobromine, also known as xantheose, is the principal alkaloid of ''Theobroma cacao'' (cacao plant). Theobromine is slightly water-soluble (330 mg/L) with a bitter taste. In industry, theobromine is used as an additive and precursor to ...
,
[ as well as ]tannin
Tannins (or tannoids) are a class of astringent, polyphenolic biomolecules that bind to and Precipitation (chemistry), precipitate proteins and various other organic compounds including amino acids and alkaloids. The term ''tannin'' is widel ...
s, alkaloid
Alkaloids are a broad class of natural product, naturally occurring organic compounds that contain at least one nitrogen atom. Some synthetic compounds of similar structure may also be termed alkaloids.
Alkaloids are produced by a large varie ...
s, saponin
Saponins (Latin ''sapon'', 'soap' + ''-in'', 'one of') are bitter-tasting, usually toxic plant-derived secondary metabolites. They are organic chemicals that become foamy when agitated in water and have high molecular weight. They are present ...
s, and 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 ...
s.
Chemistry
Preliminary studies of phytochemical
Phytochemicals are naturally-occurring chemicals present in or extracted from plants. Some phytochemicals are nutrients for the plant, while others are metabolites produced to enhance plant survivability and reproduction.
The fields of ext ...
s in kola nut indicate the presence of various constituents: caffeine
Caffeine is a central nervous system (CNS) stimulant of the methylxanthine chemical classification, class and is the most commonly consumed Psychoactive drug, psychoactive substance globally. It is mainly used for its eugeroic (wakefulness pr ...
(2–3.5%), theobromine
Theobromine, also known as xantheose, is the principal alkaloid of ''Theobroma cacao'' (cacao plant). Theobromine is slightly water-soluble (330 mg/L) with a bitter taste. In industry, theobromine is used as an additive and precursor to ...
(1.0–2.5%), theophylline
Theophylline, also known as 1,3-dimethylxanthine, is a drug that inhibits phosphodiesterase and blocks adenosine receptors. It is used to treat chronic obstructive pulmonary disease (COPD) and asthma. Its pharmacology is similar to other met ...
, methylliberine, polyphenol
Polyphenols () are a large family of naturally occurring phenols. They are abundant in plants and structurally diverse. Polyphenols include phenolic acids, flavonoids, tannic acid, and ellagitannin, some of which have been used historically as ...
s, catechin
Catechin is a flavan-3-ol, a type of secondary metabolite providing antioxidant roles in plants. It belongs to the subgroup of polyphenols called flavonoids.
The name of the catechin chemical family derives from ''catechu'', which is the tannic ...
s, and phlobaphen
Phlobaphenes (or phlobaphens, CAS No.:71663-19-9) are reddish, alcohol-soluble and water-insoluble phenolic substances. They can be extracted from plants, or be the result from treatment of tannin extracts with mineral acids (tanner's red). The nam ...
s (''kola red''), among others.
Cultivation
Originally a tree of the tropical rainforest
Tropical rainforests are dense and warm rainforests with high rainfall typically found between 10° north and south of the Equator. They are a subset of the tropical forest biome that occurs roughly within the 28° latitudes (in the torrid zo ...
, it needs a hot humid climate, but can withstand a dry season on sites with a high ground water level. It may be cultivated in drier areas where groundwater is available. ''C. nitida'' is a shade bearer, but develops a better spreading crown which yields more fruits in open places. Though it is a lowland forest tree, it has been found at altitudes over 300 m on deep, rich soils under heavy and evenly distributed rainfall.
Regular weeding is necessary, which can be performed manually or through the use of herbicide
Herbicides (, ), also commonly known as weed killers, are substances used to control undesired plants, also known as weeds.EPA. February 201Pesticides Industry. Sales and Usage 2006 and 2007: Market Estimates. Summary in press releasMain page f ...
s. Some irrigation can be provided to the plants, but it is important to remove the water through an effective drainage system, as excess water may prove to be detrimental for the growth of the plant. When not grown in adequate shade, the kola nut plant responds well to fertilizers. Usually, the plants need to be provided with windbreaks to protect them from strong gales.
Kola nuts can be harvested mechanically or by hand, by plucking them at the tree branch. Nigeria produces 52.4% of worldwide production followed by the Ivory Coast and Cameroon. When kept in a cool, dry place, kola nuts can be stored for a long time.
The crop's value makes it one of the most important indigenous cash crops in West Africa and is used as a means of social mobility.
Pests and diseases
The nuts are subject to attack by the kola weevil '' Balanogastris kolae''. The larvae of the moth '' Characoma strictigrapta'' that also attacks cacao bore into the nuts. Traders sometimes apply an extract of the bark of ''Rauvolfia vomitoria
''Rauvolfia vomitoria'', the poison devil's-pepper, is a plant species in the genus ''Rauvolfia''. It is native from Senegal east to Sudan and Tanzania, south to Angola; and naturalized in China, Bangladesh, different ranges of Himalayan and Pue ...
'' or the pulverised fruits of '' Xylopia'' and ''Capsicum
''Capsicum'' () is a genus of flowering plants in the Solanum, nightshade family Solanaceae, native to the Americas, cultivated worldwide for their edible fruit, which are generally known as "peppers" or "capsicum". Chili peppers grow on five s ...
'' to counteract the attack on nursery plants. The cacao pests '' Sahlbergella'' spp. have been found also on ''C. nitida'' as an alternative host plant. While seeds are liable to worm attack, the wood is subject to borer attack.
Production
In 2022, world production of kola nuts was , led by Nigeria with 55% of the total (table).
Uses
The kola nut has a bitter flavor and contains caffeine. The nut is a nervous system stimulant and is chewed in many West African
West Africa, also known as Western Africa, is the westernmost region of Africa. The United Nations defines Western Africa as the 16 countries of Benin, Burkina Faso, Cape Verde, The Gambia, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Ma ...
countries, in both private and social settings. It is often used ceremonially, presented to chiefs or guests. Throughout history, kola nuts have been planted on graves as part of various rituals. Laborers in many countries also grow kola nuts in efforts to fight fatigue and hunger, while Brazilians and people of the West Indies use the nut as a remedy for hangovers, intoxication, and diarrhea.
In folk medicine
Traditional medicine (also known as indigenous medicine or folk medicine) refers to the knowledge, skills, and practices rooted in the cultural beliefs of various societies, especially Indigenous groups, used for maintaining health and treatin ...
, kola nuts are considered useful for aiding digestion
Digestion is the breakdown of large insoluble food compounds into small water-soluble components so that they can be absorbed into the blood plasma. In certain organisms, these smaller substances are absorbed through the small intestine into th ...
when ground and mixed with honey, and are used as a remedy for cough
A cough is a sudden expulsion of air through the large breathing passages which can help clear them of fluids, irritants, foreign particles and Microorganism, microbes. As a protective reflex, coughing can be repetitive with the cough reflex fol ...
s.
Kola nuts are perhaps best known to Western culture
Western culture, also known as Western civilization, European civilization, Occidental culture, Western society, or simply the West, refers to the Cultural heritage, internally diverse culture of the Western world. The term "Western" encompas ...
as a flavoring ingredient and one of the sources of caffeine in cola
Cola is a Carbonation, carbonated soft drink flavored with vanilla, cinnamon, citrus essential oil, oils, and other flavorings. Cola became popular worldwide after the American pharmacist John Stith Pemberton invented Coca-Cola, a trademarked br ...
and other similarly flavored beverages, although kola nut extract is no longer claimed on the labels of major commercial cola drinks such as Coca-Cola
Coca-Cola, or Coke, is a cola soft drink manufactured by the Coca-Cola Company. In 2013, Coke products were sold in over 200 countries and territories worldwide, with consumers drinking more than 1.8 billion company beverage servings ...
.
History
Human use of the kola nut, like the coffee berry and tea leaf, appears to have ancient origins.[ The spread of the kola nut across North Africa seems to be connected to the spread of Islam across West Africa during the 17th century, as trading across the Mediterranean became established. The kola nut was particularly useful on slave ships to improve the taste of water, as enslaved Africans were often given poor quality water to drink.] A French voyager named Chevalier Des Marchais, who traveled to West Africa in the late 1720s, noted that the nut made the, "bitterest, our sourest Things taste Sweet after it." These sweet alterations are attributed to the chemical substances that the nut adds to one's palate or the sheer amount of caffeine.
Kola nuts were used as an ingredient within Coca-Cola and Pepsi-Cola in 1886 and 1888 respectively. Kola nuts are an important part of the traditional spiritual practice, culture, and religion in West Africa, particularly Ghana
Ghana, officially the Republic of Ghana, is a country in West Africa. It is situated along the Gulf of Guinea and the Atlantic Ocean to the south, and shares borders with Côte d’Ivoire to the west, Burkina Faso to the north, and Togo to t ...
, Niger
Niger, officially the Republic of the Niger, is a landlocked country in West Africa. It is a unitary state Geography of Niger#Political geography, bordered by Libya to the Libya–Niger border, north-east, Chad to the Chad–Niger border, east ...
, Nigeria
Nigeria, officially the Federal Republic of Nigeria, is a country in West Africa. It is situated between the Sahel to the north and the Gulf of Guinea in the Atlantic Ocean to the south. It covers an area of . With Demographics of Nigeria, ...
, Sierra Leone
Sierra Leone, officially the Republic of Sierra Leone, is a country on the southwest coast of West Africa. It is bordered to the southeast by Liberia and by Guinea to the north. Sierra Leone's land area is . It has a tropical climate and envi ...
, Democratic Republic of Congo
The Democratic Republic of the Congo (DRC), also known as the DR Congo, Congo-Kinshasa, or simply the Congo (the last ambiguously also referring to the neighbouring Republic of the Congo), is a country in Central Africa. By land area, it is t ...
and Liberia
Liberia, officially the Republic of Liberia, is a country on the West African coast. It is bordered by Sierra Leone to Liberia–Sierra Leone border, its northwest, Guinea to Guinea–Liberia border, its north, Ivory Coast to Ivory Coast–Lib ...
.
Cola recipe
In the 1880s, a pharmacist in Georgia, John Pemberton, took caffeine extracted from kola nuts and cocaine
Cocaine is a tropane alkaloid and central nervous system stimulant, derived primarily from the leaves of two South American coca plants, ''Erythroxylum coca'' and ''Erythroxylum novogranatense, E. novogranatense'', which are cultivated a ...
-containing extracts from coca
Coca is any of the four cultivated plants in the family Erythroxylaceae, native to western South America. Coca is known worldwide for its psychoactive alkaloid, cocaine. Coca leaves contain cocaine which acts as a mild stimulant when chewed or ...
leaves and mixed them with sugar, other flavorings, and carbonated water
Carbonated water is water containing dissolved carbon dioxide gas, either artificially injected under pressure, or occurring due to natural geological processes. Carbonation causes small bubbles to form, giving the water an effervescent quali ...
to invent Coca-Cola
Coca-Cola, or Coke, is a cola soft drink manufactured by the Coca-Cola Company. In 2013, Coke products were sold in over 200 countries and territories worldwide, with consumers drinking more than 1.8 billion company beverage servings ...
, the first widely popular cola
Cola is a Carbonation, carbonated soft drink flavored with vanilla, cinnamon, citrus essential oil, oils, and other flavorings. Cola became popular worldwide after the American pharmacist John Stith Pemberton invented Coca-Cola, a trademarked br ...
soft drink.[ Although the exact details of its cola recipe remain confidential, as of 2016, the ]Coca-Cola formula
The Coca-Cola Company's formula for Coca-Cola syrup, which bottlers combine with carbonated water to create the company's flagship cola soft drink, is a closely guarded trade secret. Company founder Asa Candler initiated the veil of secrecy t ...
no longer contained actual kola nut extract,[ and an independent test conducted to identify it failed to detect its signature proteins.]
In culture
Used in cultural traditions of the Igbo people
The Igbo people ( , ; also spelled Ibo" and historically also ''Iboe'', ''Ebo'', ''Eboe'',
/
/
''Eboans'', ''Heebo'';
natively ) are an ethnic group found in Nigeria, Cameroon, Gabon, and Equatorial Guinea. Their primary origin is fo ...
, the presentation of kola nuts to guests or in a traditional gathering shows good will. It is implemented in Yoruba religion
The Yorùbá religion (Yoruba language, Yoruba: Ìṣẹ̀ṣe), West African Orisa (Òrìṣà), or Isese (Ìṣẹ̀ṣe), comprises the traditional religious and spiritual concepts and practice of the Yoruba people. Its homeland is in pres ...
both as an offering to orisha
Orishas (singular: orisha) are divine spirits that play a key role in the Yoruba religion of West Africa and several religions of the African diaspora that derive from it, such as Haitian Vaudou, Cuban Santería and Brazilian Candomblé. The p ...
s and as an instrument of divination
Divination () is the attempt to gain insight into a question or situation by way of an occultic ritual or practice. Using various methods throughout history, diviners ascertain their interpretations of how a should proceed by reading signs, ...
.
A kola nut ceremony is briefly described in Chinua Achebe
Chinua Achebe (; born Albert Chinụalụmọgụ Achebe; 16 November 1930 – 21 March 2013) was a Nigerian novelist, poet, and critic who is regarded as a central figure of modern African literature. His first novel ''Things Fall Apart'' ( ...
's 1958 novel ''Things Fall Apart
''Things Fall Apart'' is a 1958 novel by Nigerian author Chinua Achebe. It is Achebe's debut novel and was written when he was working at the Nigerian Broadcasting Corporation. The novel was first published in London by Heinemann (publisher), ...
''. The eating of kola nuts is referred to at least ten times in the novel, showing the kola nut's significance in pre-colonial 1890s Igbo culture in Nigeria. One of these sayings on kola nut in ''Things Fall Apart'' is "He who brings kola brings life." It is also featured prominently in Chris Abani's 2004 novel ''GraceLand
Graceland is a mansion on a estate in Memphis, Tennessee, United States, once owned by American singer Elvis Presley. Presley is buried there, as are his parents Vernon and Gladys, paternal grandmother Minnie Mae, grandson Benjamin, and daugh ...
''. The kola nut is also mentioned in '' The Color Purple'' by Alice Walker
Alice Malsenior Tallulah-Kate Walker (born February 9, 1944) is an American novelist, short story writer, poet, and social activist. In 1982, she became the first African-American woman to win the Pulitzer Prize for Fiction, which she was awa ...
, although it is spelled "cola".[Walker, Alice (1992). ''The Color Purple''. Houghton Mifflin Harcourt. p. 160. .]
The kola nut is mentioned in Bloc Party
Bloc Party are an English Rock music, rock band that was formed in London, England, London in 1999 by co-founders Kele Okereke (lead vocals, rhythm guitar, piano, sampler) and Russell Lissack (lead guitar). Their first four albums all featur ...
's song "Where is Home?" on the album '' A Weekend in the City''. The lyric, setting a post-funeral scene for the murder of a black boy in London, reads, "After the funeral, breaking kola nuts, we sit and reminisce about the past." The kola nut is mentioned in the At the Drive-In
At the Drive-In was an American post-hardcore band from El Paso, Texas, formed in 1994. The band's most recent line-up consisted of Cedric Bixler-Zavala (vocals), Omar Rodríguez-López (guitar, vocals), Paul Hinojos (bass), Tony Hajjar (drums ...
song "Enfilade" on the album ''Relationship of Command
''Relationship of Command'' is the third studio album by American post-hardcore band At the Drive-In, released on September 12, 2000. The album combines an aggressive edge with a melodic drive, harmonious, emotive vocals, and surreal lyrics. Whil ...
''. The kola nut is repeatedly mentioned in Chimamanda Ngozi Adichie
Chimamanda Ngozi Adichie (born Grace Ngozi Adichie; 15 September 1977) is a Nigerians, Nigerian writer of novels, short stories, poem, and children's books; she is also a book reviewer and literary critic. Her most famous works include ''Purple ...
's novel ''Half of a Yellow Sun
''Half of a Yellow Sun'' is a 2006 novel by Nigerian author Chimamanda Ngozi Adichie. It became instantly successful after its publication; in the United States and Nigeria, it is widely read in high schools and middle schools. ''Half of a Y ...
'', which also features the phrase: "He who brings the Kola nut brings life."
Gallery
File:Cola-Acuminata-Heckel.jpg, Seeds of true / "female" kola (= ''Cola acuminata
''Cola acuminata'' is a species in the genus ''Cola'', of the family Malvaceae, native to tropical Africa. It is generally known for its fruit, the kola nut, originally used to impart the cola flavor in manufactured beverages, such as Coca-Col ...
'') compared and contrasted with those of bitter / "male" kola (= '' Garcinia kola'')
File:Theobroma cacao - fruit, from inside, beans.jpg, Cocoa pod: fruit of (true) kola relative ''Theobroma cacao
''Theobroma cacao'' (cacao tree or cocoa tree) is a small ( tall) evergreen tree in the Malvaceae family. Its seedscocoa beansare used to make chocolate liquor, cocoa solids, cocoa butter and chocolate. Although the tree is native to the tropi ...
'' bisected to show similarity of structure to that of fruit of ''Cola acuminata''
References
External links
''Cola acuminata'' - (P.Beauv.) Schott & Endl., Plants For A Future, 2012
The Rise and Fall of Cocaine Cola
{{Nuts
Cola (plant)
Caffeine
Herbal and fungal stimulants
Edible nuts and seeds
Crops originating from Africa
Plants used in traditional African medicine