Açaí palm

The açaí palm (/əˈsaɪ.iː/, Portuguese: [asaˈi] ⓘ, from Nheengatu asai),[2] Euterpe oleracea, is a species of palm tree (Arecaceae) cultivated for its fruit (açaí berries, or simply açaí), hearts of palm (a vegetable), leaves, and trunk wood. Global demand for the fruit has expanded rapidly in the 21st century, and the tree is cultivated for that purpose primarily.

Açaí palm
A tree at the Lauro Sodré Palace in Brazil
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Arecales
Family: Arecaceae
Genus: Euterpe
Species:
E. oleracea
Binomial name
Euterpe oleracea
Synonyms[1]
  • Euterpe brasiliana Oken
  • Catis martiana O.F.Cook
  • Euterpe badiocarpa Barb.Rodr.
  • Euterpe beardii L.H.Bailey
  • Euterpe cuatrecasana Dugand

The species is native to eastern Amazonia, especially in Brazil, mainly in swamps and floodplains. Açaí palms are tall, slender trees growing to more than 25 m (82 ft) tall, with pinnate leaves up to 3 m (9.8 ft) long.[3] The fruit is small, round, and black-purple in color. The fruit became a staple food in floodplain areas around the 18th century,[4][5] but its consumption in urban areas and promotion as a health food only began in the mid 1990s along with the popularization of other Amazonian fruits outside the region.[5]

Name

The common name comes from the Portuguese adaptation of the Tupian word ĩwasa'i, meaning "[fruit that] cries or expels water".[6] The importance of the fruit as a staple food in the Amazon River delta gives rise to the local legend of how the plant got its name. The folklore says that chief Itaqui ordered all newborns put to death owing to a period of famine. When his own daughter gave birth and the child was sacrificed, she cried and died beneath a newly sprouted tree. The tree fed the tribe and was called açaí because that was the daughter's name (Iaçá) spelled backwards.[7]

Its specific epithet oleracea means "vegetable" in Latin and is a form of holeraceus (oleraceus).[8][9]

Fruit
Açaí palm with fruit

The fruit, commonly known as açaí or açaí berry,[10] is a small, round, black-purple drupe about 25 mm (1 in) in circumference, similar in appearance to a grape, but smaller and with less pulp and produced in branched panicles of 500 to 900 fruits. The exocarp of the ripe fruits is a deep purple color, or green, depending on the kind of açaí and its maturity. The mesocarp is pulpy and thin, with a consistent thickness of 1 mm (0.04 in) or less. It surrounds the voluminous and hard endocarp, which contains a single large seed about 7–10 mm (0.3–0.4 in) in diameter. The seed makes up about 60–80% of the fruit. The palm bears fruit year round but the berry cannot be harvested during the rainy season.

Cultivation

There are two harvests: one is normally between January and June, while the other is between August and December. The latter harvest is the more important.[11]

Cultivars

Few named cultivars exist, and varieties differ mostly in the nature of the fruit:

  • Branco ("White") is a rare variety local to the Amazon estuary in which the berries do not change color, but remain green when ripe. This is believed to be due to a recessive gene since only about 30% of 'Branco' palm seeds mature to express this trait.[12]
  • BRS-Pará was developed in 2004 by the Brazilian Agricultural Research Agency. The pulp yield ranges from 15% to 25%.[13]
  • BRS Pai d'Égua is the newest cultivar developed by the Brazilian Agricultural Research Agency.[14]

Anthocyanins

Anthocyanins define the blue pigmentation of açaí and the antioxidant capacity of the plant's natural defense mechanisms[15] and in laboratory experiments in vitro.[16] Anthocyanins in açaí accounted for only about 10% of the overall antioxidant capacity in vitro.[17] The Linus Pauling Institute and European Food Safety Authority state that "the relative contribution of dietary flavonoids to (...) antioxidant function in vivo is likely to be very small or negligible".[18][19][20] Unlike in controlled test tube conditions, anthocyanins have been shown to be poorly conserved (less than 5%) in vivo, and most of what is absorbed exists as chemically modified metabolites destined for rapid excretion.[21][22]

A powdered preparation of freeze-dried açaí fruit pulp and skin was shown to contain cyanidin 3-O-glucoside and cyanidin 3-O-rutinoside as major anthocyanins (3.19 mg/g).[23] The powdered preparation was also reported to contain twelve flavonoid-like compounds, including homoorientin, orientin, taxifolin deoxyhexose, isovitexin, scoparin, as well as proanthocyanidins (12.89 mg/g), and low levels of resveratrol (1.1 μg/g).[24]

Nutritional content

A powdered preparation of freeze-dried açaí fruit pulp and skin was reported to contain (per 100 g of dry powder) 534 calories, 52 g carbohydrates, 8 g protein, and 33 g total fat. The carbohydrate portion included 44 g of dietary fiber with low sugar levels, and the fat portion consisted of oleic acid (56% of total fats), palmitic acid (24%), and linoleic acid (13%).[24] The powder was also shown to contain (per 100 g) negligible vitamin C, 260 mg calcium, 4 mg iron, and 1002 IU vitamin A.[24]

Marketing

In the 1980s, the Brazilian Gracie family marketed açaí as an energy drink or as crushed fruit served with granola and bananas; this demand led to the building of cottage industries and processing plants to pulp and freeze açaí for export.[25]

Scams

In the early 2000s, numerous companies advertised açaí products online, with many ads featuring counterfeit testimonials and products.[25][26][27] In 2009, açaí scams were ranked #1 on the US FTC's "scams and rip-offs" list, so that by 2011 sales of açaí flattened as the fad waned.[25]

According to the Washington, D.C.-based Center for Science in the Public Interest thousands of consumers had trouble stopping recurrent charges on their credit cards when they canceled free trials of some açai-based products.[28][29] In 2003, American celebrity doctor Nicholas Perricone included açaí berries among "superfoods", but such extravagant marketing claims regarding açaí as miracle cures for everything from obesity to attention-deficit disorder were challenged in subsequent studies.[30]

The FTC handed down an $80 million judgement in January 2012 against five companies that were marketing açaí berry supplements with fraudulent claims that their products promoted weight loss and prevented colon cancer. One company, Central Coast Nutraceuticals, was ordered to pay a $1.5 million settlement.[31][32]

Production
Street vendor of açaí, next to Ver-o-Peso market in Belém

Brazil is a major producer, particularly in the state of Pará, which alone in 2019 produced more than 1.2 million tons of açaí, an amount equal to 95% of Brazil's total.[33]

Uses

As a food product

Fresh açaí has been consumed as a dietary staple in the region around the Amazon river delta for centuries.[25][34] The fruit is processed into pulp for supply to food product manufacturers or retailers, sold as frozen pulp, juice, or an ingredient in various products from beverages, including grain alcohol, smoothies, foods, cosmetics and supplements.[11] In Brazil, it is commonly eaten as açaí na tigela.

In a study of three traditional Caboclo populations in the Brazilian Amazon, açaí palm was described as the most important plant species because the fruit makes up a major component of their diet, up to 42% of the total food intake by weight.[35]

Açaí bowl

Açaí na tigela (known in English as açaí bowl) is a Brazilian dessert made from frozen açaí berry purée, served in a bowl and topped with other fruit and granola.[36][37]

Dietary supplement
See also: Enforcement actions against açaí berry supplement manufacturers

As of 2008, no açaí products have been evaluated by the FDA, and their efficacy is doubtful.[27]

As of 2009, there is no scientific evidence that açaí consumption affects body weight, promotes weight loss or has any positive health effect.[38]

Açaí oil
See also: Açaí oil
Açai oil

Açaí oil is suitable for cooking or as a salad dressing, but is mainly used in cosmetics as shampoos, soaps or skin moisturizers.[39]

The oil compartments in açaí fruit contain polyphenols such as procyanidin oligomers and vanillic acid, syringic acid, p-hydroxybenzoic acid, protocatechuic acid, and ferulic acid, which were shown to degrade substantially during storage or exposure to heat.[39] Although these compounds are under study for potential health effects, there remains no substantial evidence that açaí polyphenols have any effect in humans.[24][39] Açaí oil is green in color, has a bland aroma, and is high in oleic and palmitic fatty acids.[40]

Other uses

Leaves of the palm may be made into hats, mats, baskets, brooms and roof thatch for homes, and trunk wood, resistant to pests, for building construction.[41] Tree trunks may be processed to yield dietary minerals.[42]

Comprising 80% of the fruit mass, açaí seeds may be ground for livestock food or as a component of organic soil for plants. Planted seeds are used for new palm tree stock, which, under the right growing conditions, can require months to form seedlings.[41][43] Seeds may become waste in landfills or used as fuel for producing bricks.[44]

Research

Orally administered açaí has been tested as a contrast agent for magnetic resonance imaging (MRI) of the gastrointestinal system.[45][46] Its anthocyanins have also been characterized for stability as a natural food coloring agent.[47]

  • A grove of açaí palms in Brazil
    A grove of açaí palms in Brazil
  • Separation of açaí pulp from seeds in market Belém, Pará, Brazil
    Separation of açaí pulp from seeds in market Belém, Pará, Brazil
  • An açaí harvest
    An açaí harvest
  • Japanese açaí candy
    Japanese açaí candy

See also

References
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  2. "acai". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  3. "Palm trees" (PDF). The Food and Agriculture Organization of the United Nations. Archived (PDF) from the original on 18 May 2019.
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  5. Brondízio, Eduardo S.; Safar, Carolina A.M.; Siqueira, Andréa D. (1 March 2002). "The urban market of Açaí fruit (Euterpe oleracea Mart.) and rural land use change: Ethnographic insights into the role of price and land tenure constraining agricultural choices in the Amazon estuary". Urban Ecosystems. 6 (1): 71. doi:10.1023/A:1025966613562. ISSN 1573-1642. S2CID 25276291.
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  9. Whitney, William Dwight (1899). The Century Dictionary and Cyclopedia. Century Co. p. 2856. L. holeraceus, prop. oleraceus, herb-like, holus, prop. olus (oler-), herbs, vegetables
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Further reading
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