The açaí palm (Portuguese: [asaˈi] (listen), from Tupi-Guarani asaí), 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 expanded rapidly in the 21st century and so the tree is cultivated for that purpose primarily.
Euterpe oleracea is mostly native to Brazil, Trinidad and Tobago and other countries of northern South America, 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. The fruit is small, round, and black-purple in color and may be sold as a frozen fruit puree or bottled juice drink with added sugar or other sweeteners.
The common name comes from the Portuguese adaptation of the Tupian word ïwaca'i, meaning "[fruit that] cries or expels water". 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.
The fruit, commonly known as açaí berry or açaí, 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.
There are two harvests: one is normally between January and June, while the other is between August and December. The last harvest is the most important.
- 'Branco' 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. It has less iron and fewer antioxidants, but more oil, and many believe it to have a superior taste and digestibility to purple açaí.
- 'BRS-Para Dwarf' was developed by the Brazilian Agricultural Research Agency. The pulp yield ranges from 15% to 25%..
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%). The powder was also shown to contain (per 100 g) negligible vitamin C, 260 mg calcium, 4 mg iron, and 1002 IU vitamin A.
A comparative analysis from in vitro studies reported that açaí has intermediate polyphenol content relative to 11 varieties of frozen juice pulps, scoring lower than acerola, mango, strawberry, and grapes. The extent to which polyphenols as dietary antioxidants may promote health is unknown, as no credible evidence indicates any antioxidant role for polyphenols in vivo.
When three commercially available juice mixes, containing unspecified percentages of açaí juice, were compared for in vitro antioxidant capacity against red wine, tea, six types of pure fruit juice, and pomegranate juice, the average antioxidant capacity ranked lower than that of pomegranate juice, Concord grape juice, blueberry juice, and red wine. The average was roughly equivalent to that of black cherry or cranberry juice, and was higher than that of orange juice, apple juice, and tea.
The medical watchdog website Quackwatch said that "açaí juice has only middling levels of antioxidants — less than that of Concord grape, blueberry, and black cherry juices, but more than cranberry, orange, and apple juices."
The anthocyanins of açaí likely have relevance to antioxidant capacity only in the plant's natural defense mechanisms, and in vitro. Anthocyanins in açaí accounted for only about 10% of the overall antioxidant capacity in vitro. 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". But unlike controlled test tube conditions, in vivo anthocyanins have been shown to be poorly conserved (less than 5%), and most of what is absorbed exists as chemically modified metabolites destined for rapid excretion.
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). 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).
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. In the early 2000s, Ryan and Jeremy Black started Sambazon to import açaí into the US.
In the early 2000s, many companies flooded the internet with açaí advertising, many of them with counterfeit testimonials and products. 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.
Açaí was promoted heavily for its antioxidants, and many false claims were and are made, including a reversal of diabetes and other chronic illnesses, as well as expanding size of the penis and increasing men's sexual virility. According to the Washington, D.C.-based Center for Science in the Public Interest thousands of consumers have had trouble stopping recurrent charges on their credit cards when they cancel free trials of some açai-based products. Even some websites purporting to warn about açai-related scams are themselves perpetrating scams.
By 2011, Ralph Carson, the formulator of MonaVie, cautioned the public that the product was in fact nothing more than "expensive flavored water” and that any claims made about it were “purely hypothetical, unsubstantiated and, quite frankly, bogus".
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.
As a food product
Fresh açaí has been consumed as a dietary staple in the region around the Amazon river delta for centuries. 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. 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.
In North America, açaí is commonly sold in "açaí bowls", a combination of frozen açaí puree or açaí powder with other ingredients, such as nut milk, fruit juice, fruit, nuts, oatmeal, and sweeteners. Açaí bowls may contain more than 50 g of sugar (the equivalent of 12 teaspoons), or double what the American Heart Association recommends for an entire day, and have been described by nutritionists as a "sugar bomb", "glorified dessert" or "occasional treat", more akin to eating a bowl of ice cream than a meal.
As of 2015, there are no scientifically controlled studies providing proof of any health benefits from consuming açaí. No açaí products have been evaluated by the FDA, and their efficacy is doubtful. Specifically, there is no scientific evidence that açaí consumption affects body weight, promotes weight loss or has any positive health effect.
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. Although these compounds are under study for potential health effects, there remains no substantial evidence that açaí polyphenols have any effect in humans. Açaí oil is green in color, has a bland aroma, and is high in oleic and palmitic fatty acids.
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. Tree trunks may be processed to yield dietary minerals.
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. Seeds may become waste in landfills or used as fuel for producing bricks.
Orally administered açaí has been tested as a contrast agent for magnetic resonance imaging (MRI) of the gastrointestinal system. Its anthocyanins have also been characterized for stability as a natural food coloring agent.
A grove of açaí palms in Brazil
- Açaí bowl
- Açaí oil
- Euterpe edulis
- Euterpe precatoria
- Enforcement actions against açaí berry supplement manufacturers
- "Synonyms for Euterpe oleracea Mart., Hist. Nat. Palm. 2: 29 (1824)". Royal Botanic Gardens, Kew, UK. 2017.
- açai: definition of açai in Oxford dictionary - American English (US)
- "Euterpe oleracea". Food and Agriculture Organization. Retrieved February 2, 2013.
- "Acai – What is it and Where Does it Come From?". International Business Times. 2009-09-10. Retrieved 2018-06-20.
- Marcason, W. (2009). "What is the Açaí Berry and Are There Health Benefits?". Journal of the American Dietetic Association. 109 (11): 1968. doi:10.1016/j.jada.2009.09.017. PMID 19857637.
- "Worldwide demand for açaí is growing". Fresh Plaza. Retrieved 1 May 2017.
- DuVal, A (2010). "Açaí Branco: Maintaining Agrobiodiversity through a Local Seed System in the Amazon Estuary" (PDF). Tropical Bulletin: Yale University Tropical Resources Institute. 29.
- "Cultivar de açaizeiro BRS Pará - Portal Embrapa". www.embrapa.br. Retrieved 2018-12-20.
- Schauss, AG; Wu, X; Prior, RL; Ou, B; Patel, D; Huang, D; Kababick, JP (2006). "Phytochemical and nutrient composition of the freeze-dried amazonian palmberry, Euterpe oleraceae Mart. (acai)". J Agric Food Chem. 54 (22): 8598–603. doi:10.1021/jf060976g. PMID 17061839.
- Kuskoski, EM; Asuero, AG; Morales, MT; Fett, R (2006). "Wild fruits and pulps of frozen fruits: antioxidant activity, polyphenols and anthocyanins". Cienc Rural. 36 (4 (July/Aug)): 1283–1287. doi:10.1590/S0103-84782006000400037.
- Williams RJ, Spencer JP, Rice-Evans C (April 2004). "Flavonoids: antioxidants or signalling molecules?". Free Radic Biol Med. 36 (7): 838–49. doi:10.1016/j.freeradbiomed.2004.01.001. PMID 15019969.
- Frei B. "Controversy: What are the true biological functions of superfruit antioxidants?". Natural Products Information Center. Archived from the original on 6 March 2010. Retrieved 24 January 2013.
- Joven J, Micol V, Segura-Carretero A, Alonso-Villaverde C, Menéndez JA; Bioactive Food Components Platform (2014). "Polyphenols and the modulation of gene expression pathways: can we eat our way out of the danger of chronic disease?". Crit Rev Food Sci Nutr. 54 (8): 985–1001. doi:10.1080/10408398.2011.621772. PMID 24499117.CS1 maint: Uses authors parameter (link)
- Seeram NP, Aviram M, Zhang Y (Feb 2008). "Comparison of antioxidant potency of commonly consumed polyphenol-rich beverages in the United States". J Agric Food Chem. 56 (4): 1415–22. doi:10.1021/jf073035s. PMID 18220345.
- Simon PW (1996). "Plant Pigments for Color and Nutrition". Vegetable Crops Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Department of Horticulture, University of Wisconsin, Madison, WI.
- De Rosso VV, Morán Vieyra FE, Mercadante AZ, Borsarelli CD (October 2008). "Singlet oxygen quenching by anthocyanin's flavylium cations". Free Radical Research. 42 (10): 885–91. doi:10.1080/10715760802506349. PMID 18985487.
- Lichtenthäler R, Rodrigues RB, Maia JG, Papagiannopoulos M, Fabricius H, Marx F (Feb 2005). "Total oxidant scavenging capacities of Euterpe oleracea Mart. (Açaí) fruits". Int J Food Sci Nutr. 56 (1): 53–64. doi:10.1080/09637480500082082. PMID 16019315.
- Lotito SB, Frei B (2006). "Consumption of flavonoid-rich foods and increased plasma antioxidant capacity in humans: cause, consequence, or epiphenomenon?". Free Radic. Biol. Med. 41 (12): 1727–46. doi:10.1016/j.freeradbiomed.2006.04.033. PMID 17157175.
- Williams RJ, Spencer JP, Rice-Evans C (April 2004). "Flavonoids: antioxidants or signalling molecules?". Free Radical Biology & Medicine. 36 (7): 838–49. doi:10.1016/j.freeradbiomed.2004.01.001. PMID 15019969.
- Scientific Opinion on the substantiation of health claims related to various food(s)/food constituent(s) and protection of cells from premature aging, antioxidant activity, antioxidant content and antioxidant properties, and protection of DNA, proteins and lipids from oxidative damage pursuant to Article 13(1) of Regulation (EC) No 1924/20061, EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA)2, 3 European Food Safety Authority (EFSA), Parma, Italy, EFSA Journal 2010; 8(2):1489
- "Flavonoids". Linus Pauling Institute, Micronutrient Information Center, Oregon State University. 2015. Retrieved 8 June 2015.
- Manach, C; Williamson, G; Morand, C; Scalbert, A; Rémésy, C (2005). "Bioavailability and bioefficacy of polyphenols in humans. I. Review of 97 bioavailability studies". American Journal of Clinical Nutrition. 81 (1 Suppl): 230S–242S. PMID 15640486.
- Polyphenolic Constituents of Fruit Pulp of Euterpe oleracea Mart. (Açai palm). S. Gallori, A. R. Bilia, M. C. Bergonzi, W. L. R. Barbosa and F. F. Vincieri, Chromatographia, 2004, Volume 59, Numbers 11-12, pages 739-743, doi:10.1365/s10337-004-0305-x
- Colapinto, John (May 30, 2011). "Strange Fruit". The New Yorker.
- Cheeseman, G-M. "How sustainability is embedded in Sambazon". The Guardian. Retrieved 1 May 2017.
- Ellin, Abbey (12 March 2009). "Pressing Açaí foraçaí Answers". The New York Times.
- James, SD (2008-12-12). "'Superfood' açaí may not be worth price: Oprah's Dr. Oz says açai is healthy but no cure-all; Dieter feels ripped off". ABC News. Archived from the original on 19 December 2008. Retrieved 2008-12-30.
- "Reality check"
- "Oprah is coming after bad Internet Marketers". Adotas.
- "AG warns about deceptive weight loss supplement offer". King5 News. Archived from the original on 31 August 2009. Retrieved 9 September 2009.
- Center for Science in the Public Interest (2009-03-23). "CSPI Warns Consumers about Web-Based Açai Scams". CSPI. Retrieved 2012-09-02.
- Harvey, Tom (December 10, 2011). "Utah juice companies offer few prospects". Salt Lake Tribune. Retrieved November 2, 2012.
- "Marketers of acai products fined $1.5 million for false claims and unfair billing". Consumer Reports. January 9, 2012. Retrieved November 2, 2017.
- "Internet Marketers of Acai Berry Weight-Loss Pills and "Colon Cleansers" to Pay $1.5 Million to Settle FTC Charges of Deceptive Advertising and Unfair Billing". Federal Trade Commission. January 9, 2012. Retrieved November 2, 2017.
- de Santana, A.C. "Açaí pulp demand in the retail market of Belem, state of Para". Revista Brasileira de Fruticultura. Retrieved 1 May 2017.
- Murrieta RS, Dufour DL, Siqueira AD (1999). "Food consumption and subsistence in three Caboclo populations on Marajo Island, Amazonia, Brazil". Human Ecology. 27: 455–75. doi:10.1023/A:1018779624490.
- D'Souza, Karen (October 5, 2017). "Acai bowls: Healthy snack or sugar bomb?". Mercury News. Retrieved December 21, 2018.
- Shannon-Karasik, Caroline (November 20, 2018). "Are Acai Bowls Really Healthy?". Women's Health. Retrieved December 21, 2018.
- Stanley, Andrea (January 18, 2017). "Are Acai Bowls Really Healthy?". Shape. Retrieved December 21, 2018.
- Pacheco-Palencia LA, Mertens-Talcott S, Talcott ST (Jun 2008). "Chemical composition, antioxidant properties, and thermal stability of a phytochemical enriched oil from Açaí (Euterpe oleracea Mart.)". J Agric Food Chem. 56 (12): 4631–6. doi:10.1021/jf800161u. PMID 18522407.
- Neida, S; Elba, S. (2007). "Characterization of the acai or manaca (Euterpe oleracea Mart.): a fruit of the Amazon". Arch Latinoam Nutr (in Spanish). 57 (1): 94–8. PMID 17824205.
- Silva, S. & Tassara, H. (2005). Fruit Brazil Fruit. São Paulo, Brazil, Empresa das Artes
- Dyer, A. P. 1996. Latent energy in Euterpe oleracea. Biomass Energy Environ., Proc. Bioenergy Conf. 9th.
- Plotkin MJ, Balick MJ (Apr 1984). "Medicinal uses of South American palms". J Ethnopharmacol. 10 (2): 157–79. doi:10.1016/0378-8741(84)90001-1. PMID 6727398.
- Córdova-Fraga T, de Araujo DB, Sanchez TA, et al. (Apr 2004). "Euterpe olerácea (Açaí) as an alternative oral contrast agent in MRI of the gastrointestinal system: preliminary results". Magn Reson Imaging. 22 (3): 389–93. doi:10.1016/j.mri.2004.01.018. PMID 15062934.
- Del Pozo-Insfran D, Brenes CH, Talcott ST (Mar 2004). "Phytochemical composition and pigment stability of Açaí (Euterpe oleracea Mart.)". J Agric Food Chem. 52 (6): 1539–45. doi:10.1021/jf035189n. PMID 15030208.
- Craft P, Riffle RL (2003). An encyclopedia of cultivated palms. Portland, Oregon, United States: Timber Press. ISBN 0-88192-558-6.
- Nicholas Gill. "How Açaí Helped Save Amazonian Forests". NewWorlder.