Brazil nut

Source: Wikipedia, the free encyclopedia.

Brazil nut tree
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Ericales
Family: Lecythidaceae
Genus: Bertholletia
Bonpl.
Species:
B. excelsa
Binomial name
Bertholletia excelsa
Humb. & Bonpl.

The Brazil nut (Bertholletia excelsa) is a South American tree in the family Lecythidaceae, and it is also the name of the tree's commercially harvested edible seeds.[2] It is one of the largest and longest-lived trees in the Amazon rainforest. The fruit and its nutshell – containing the edible Brazil nut – are relatively large, possibly weighing as much as 2 kg (4.4 lb) in total weight. As food, Brazil nuts are notable for diverse content of micronutrients, especially a high amount of selenium. The wood of the Brazil nut tree is prized for its quality in carpentry, flooring, and heavy construction.

Common names

In Portuguese-speaking countries, like Brazil, they are variously called "castanha-do-brasil"[3][4] (meaning "chestnuts from Brazil" in Portuguese), "castanha-do-pará" (meaning "chestnuts from Pará" in Portuguese), with other names: castanha-da-amazônia,[5] castanha-do-acre,[6] "noz amazônica" (meaning "Amazonian nut" in Portuguese), noz boliviana, tocari ("probably of Carib origin"[7]), and tururi (from Tupi turu'ri[8]) also used.[2]

In various Spanish-speaking countries of South America, Brazil nuts are called castañas de Brasil, nuez de Brasil, or castañas de Pará (or Para).[2][9]

In North America, as early as 1896, Brazil nuts were sometimes known by the

socially unacceptable.[13][14]

Description

Depiction of the Brazil nut in Scientific American Supplement, No. 598, June 18, 1887

The Brazil nut is a large tree, reaching 50 metres (160 feet) tall,[15] and with a trunk 1 to 2 m (3 to 7 ft) in diameter, making it among the largest of trees in the Amazon rainforest. It may live for 500 years or more, and can often reach a thousand years of age.[16] The stem is straight and commonly without branches for well over half the tree's height, with a large, emergent crown of long branches above the surrounding canopy of other trees.

The bark is grayish and smooth. The leaves are dry-season

calyx, six unequal cream-colored petals, and numerous stamens united into a broad, hood-shaped mass.[citation needed
]

Reproduction

Brazil nut trees produce fruit almost exclusively in pristine forests, as disturbed forests lack the large-bodied bees of the genera

pollinating the tree's flowers, with different bee genera being the primary pollinators in different areas, and different times of year.[17][18][19] Brazil nuts have been harvested from plantations, but production is low and is currently not economically viable.[2][15][20]

A freshly cut Brazil nut fruit

The fruit takes 14 months to mature after pollination of the flowers. The fruit itself is a large

endocarp
in size and weighing up to 2 kg (4 lb 7 oz). It has a hard, woody shell 8–12 mm (3812 in) thick, which contains eight to 24 wedge-shaped seeds 4–5 cm (1+58–2 in) long (the "Brazil nuts") packed like the segments of an orange, but not limited to one whorl of segments. Up to three whorls can be stacked onto each other, with the polar ends of the segments of the middle whorl nestling into the upper and lower whorls (see illustration above).

The capsule contains a small hole at one end, which enables large rodents like the

caches during wet season,[21] and the young saplings may have to wait years, in a state of dormancy, for a tree to fall and sunlight to reach it, when it starts growing again. Capuchin monkeys have been reported to open Brazil nuts using a stone as an anvil
.

Taxonomy

The Brazil nut family, the Lecythidaceae, is in the order

monotypic genus Bertholletia,[2] named after French chemist Claude Louis Berthollet.[22]

Distribution and habitat

The Brazil nut is native to the

Guianas, Venezuela, Brazil, eastern Colombia, eastern Peru, and eastern Bolivia. It occurs as scattered trees in large forests on the banks of the Amazon River, Rio Negro, Tapajós, and the Orinoco. The fruit is heavy and rigid; when the fruits fall, they pose a serious threat to vehicles and potential for traumatic brain injury of people passing under the tree.[23]

Production

Brazil nut production – 2020
Country (tonnes)
 Brazil 33,118
 Bolivia 30,843
 Peru 5,697
World 69,658
Source:
FAOSTAT of the United Nations[24]

In 2020, global production of Brazil nuts (in shells) was 69,658

Amazon regions of Brazil and Bolivia
which produced 92% of the world total (table).

Environmental effects of harvesting

Since most of the production for international trade is harvested in the wild,[25][26] the business arrangement has been advanced as a model for generating income from a tropical forest without destroying it.[25] The nuts are most often gathered by migrant workers known as castañeros (in Spanish) or castanheiros (in Portuguese).[25] Logging is a significant threat to the sustainability of the Brazil nut-harvesting industry.[25][26]

Analysis of tree ages in areas that are harvested shows that moderate and intense gathering takes so many seeds that not enough are left to replace older trees as they die.[26] Sites with light gathering activities had many young trees, while sites with intense gathering practices had nearly none.[27]

European Union import regulation

In 2003, the European Union imposed strict regulations on the import of Brazilian-harvested Brazil nuts in their shells, as the shells are considered to contain unsafe levels of aflatoxins, a potential cause of liver cancer.[28]

Toxicity

Brazil nuts are susceptible to contamination by aflatoxins, produced by fungi, once they fall to the ground.[29] Aflatoxins can cause liver damage, including possible cancer, if consumed.[28] Aflatoxin levels have been found in Brazil nuts during inspections that were far higher than the limits set by the EU.[30] However, mechanical sorting and drying was found to eliminate 98% of aflatoxins; a 2003 EU ban on importation[28] was rescinded after new tolerance levels were set.

The nuts often contain

radioactive element, with a kilogram of nuts containing an activity between 40 and 260 becquerels (1 and 7 nanocuries). This level of radium is small, although it can be about 1,000 times higher than in other common foods. According to Oak Ridge Associated Universities, elevated levels of radium in the soil does not directly cause the concentration of radium, but "the very extensive root system of the tree" can concentrate naturally occurring radioactive material, when present in the soil.[31] Radium can be concentrated in nuts only if it is present in the soil.[32]

Brazil nuts also contain barium, a metal with a chemical behavior quite similar to radium.[33] While barium, if ingested, can have toxic effects, such as weakness, vomiting, or diarrhea,[34] the amount present in Brazil nuts are orders of magnitude too small to have noticeable health effects.

Uses

Brazil nuts, dried, unblanched, shelled
Nutritional value per 100 g (3.5 oz)
Energy2,743 kJ (656 kcal)
12.27 g
Starch0.25 g
Sugars2.33 g
Dietary fiber7.5 g
66.43 g
Saturated15.137 g
Monounsaturated24.548 g
Polyunsaturated20.577 g
14.32 g
Tryptophan0.141 g
Threonine0.362 g
Isoleucine0.516 g
Leucine1.155 g
Lysine0.492 g
Methionine1.008 g
Phenylalanine0.630 g
Tyrosine0.420 g
Valine0.756 g
Arginine2.148 g
Histidine0.386 g
Alanine0.577 g
Aspartic acid1.346 g
Glutamic acid3.147 g
Glycine0.718 g
Proline0.657 g
Serine0.683 g
Niacin (B3)
2%
0.295 mg
Pantothenic acid (B5)
4%
0.184 mg
Vitamin B6
6%
0.101 mg
Folate (B9)
6%
22 μg
Vitamin C
1%
0.7 mg
Vitamin E
38%
5.73 mg
MineralsQuantity
%DV
Calcium
12%
160 mg
Iron
14%
2.43 mg
Magnesium
90%
376 mg
Manganese
52%
1.2 mg
Phosphorus
58%
725 mg
Potassium
14%
659 mg
Sodium
0%
3 mg
Zinc
37%
4.06 mg
Other constituentsQuantity
Water3.48 g
Beta-sitosterol
64 mg

Percentages estimated using US recommendations for adults.[35]
Brazil nuts after shell removal

Nutrition

Brazil nuts are 3% water, 14% protein, 12% carbohydrates, and 66% fats (table). The fat components are 16% saturated, 24% monounsaturated, and 24% polyunsaturated (see table for USDA source).

In a 100 grams (3.5 ounces) reference amount, Brazil nuts supply 659

thiamin (54% DV), vitamin E (38% DV), magnesium (106% DV), phosphorus (104% DV), manganese (57% DV), and zinc (43% DV). Calcium, iron, and potassium
are present in moderate amounts (10-19% DV, table).

Selenium

Brazil nuts are a particularly rich source of selenium, with just 28 g (1 oz) supplying 544 micrograms of selenium or 10 times the DV of 55 micrograms (see table for USDA source).[36] However, the amount of selenium within batches of nuts may vary considerably.[37]

The high selenium content is used as a biomarker in studies of selenium intake and deficiency.[38][39] Consumption of just one Brazil nut per day over 8 weeks was sufficient to restore selenium blood levels and increase HDL cholesterol in obese women.[39]

Oil

Brazil nut oil

Brazil nut

beta-sitosterol,[40] and fat-soluble vitamin E.[41]

The following table presents the composition of fatty acids in Brazil nut oil (see USDA source in nutrition table):

Palmitic acid 10%
Palmitoleic acid 0.2%
Stearic acid 6%
Oleic acid 24%
Linoleic acid 24%
Alpha-linolenic acid
0.04%
Saturated fats
16%
Unsaturated fats
48%

Wood

The

Brazilwood) is of excellent quality, having diverse uses from flooring to heavy construction.[42] Logging the trees is prohibited by law in all three producing countries (Brazil, Bolivia, and Peru). Illegal extraction of timber and land clearances present continuing threats.[43] In Brazil, cutting down a Brazil nut tree requires previous authorization from the Brazilian Institute of Environment and Renewable Natural Resources.[44][45]

Other uses

Brazil nut oil is used as a

jeweler's rouge. The charcoal from the nut shells may be used to purify water.[42]

Gallery

  • A Brazil nut tree (Castanheira)
    A Brazil nut tree (Castanheira)
  • Tree branch
    Tree branch
  • Brazil nut seeds in shell
    Brazil nut seeds in shell
  • A carved Brazil nut fruit
    A carved Brazil nut fruit

See also

References

  1. . Retrieved December 2, 2023.
  2. ^ a b c d e Mori, Scott A. "The Brazil Nut Industry – Past, Present, and Future". The New York Botanical Garden. Retrieved July 17, 2012.
  3. ^ "Nomes comuns: castanha-do-brasil, castanha-do-pará ou castanha-da-amazônia" (PDF). - Folder Embrapa
  4. ^ COSTA, J. R. (et al.).Uma das espécies nativas mais valiosas da floresta amazônica de terra firme é a castanha-do-brasil ou castanha-da-amazônia (Bertholletia excelsa), - Acta Amazônica vol. 39(4) 2009: 843 - 850
  5. . Retrieved July 8, 2023.
  6. ^ "Negócios para Amazônia sustentável" (PDF). Archived from the original (PDF) on October 19, 2016. Retrieved July 8, 2023. - Ministério do Meio Ambiente. Rio de Janeiro, 2003. p. 50.
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  8. ^ Ferreira, A. B. H. (1986). Novo Dicionário da Língua Portuguesa (2nd edition). Rio de Janeiro: Nova Fronteira. p. 1729
  9. ^ PROYECTO PARA DECLARACIÓN DE ALÉRGENOS y SUSTANCIAS QUE PRODUCEN REACCIONES ADVERSAS EN LOS RÓTULOS DE LOS ALIMENTOS, CUALQUIERA SEA SU ORIGEN, ENVASADOS EN AUSENCIA DEL CLIENTE, LISTOS PARA SER OFRECIDOS AL CONSUMIDOR (DEC. 117/006 DEL RBN) [Project for Declaration of Allergens and Substances that produce adverse reactions in food labels, whatever their origin, packaged in the absence of the client, ready to be offered to the consumer] (PDF) (Report). Argentine government. n.d. p. 3.
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  12. ^ ""Nigger", noun and adjective". Oxford English Dictionary. 2019. Retrieved November 29, 2019.
  13. ^ Essig, Laurie (July 12, 2016). "White Like Me, Nice Like Me". Psychology Today. Retrieved November 29, 2019.
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  15. ^ a b Hennessey, Tim (March 2, 2001). "The Brazil Nut (Bertholletia excelsa)". Archived from the original on January 11, 2009. Retrieved July 17, 2012.
  16. ^ Taitson, Bruno (January 18, 2007). "Harvesting nuts, improving lives in Brazil". World Wildlife Fund. Archived from the original on May 23, 2008. Retrieved July 17, 2012.
  17. S2CID 87265447
    . Retrieved June 6, 2023.
  18. ^ Moritz, A. (1984). Estudos biológicos da floração e da frutificação da castanha-do-Brasil (Bertholletia excelsa HBK) [Biological studies of flowering and fruiting of Brazil nuts (Bertholleira excelsa HKB)] (in Portuguese). Vol. 29. Archived from the original on August 17, 2009. Retrieved April 8, 2008.
  19. .
  20. ^ Ortiz, Enrique G. "The Brazil Nut Tree: More than just nuts". Archived from the original on February 16, 2008. Retrieved July 17, 2012.
  21. ^
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  22. . Retrieved January 27, 2022.
  23. .
  24. ^ "Brazil nut production in 2020; Crops/Regions/World list/Production Quantity (pick lists)". UN Food and Agriculture Organization, Corporate Statistical Database (FAOSTAT). 2020. Retrieved May 17, 2022.
  25. ^ a b c d Evans, Kate (November 7, 2013). "Harvesting both timber and Brazil nuts in Peru's Amazon forests: Can they coexist?". Forests News. Center for International Forestry Research. Retrieved May 2, 2019 – via CIFOR.org.
  26. ^ a b c Kivner, Mark (May 11, 2010). "Intensive harvests 'threaten Brazil nut tree future'". BBC News: Science and Environment. Retrieved May 2, 2019.
  27. PMID 16701269
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  28. ^ a b c "Commission Decision of 4 July 2003 imposing special conditions on the import of Brazil nuts in shell originating in or consigned from Brazil". Official Journal of the European Union: 33–38. July 5, 2003. 2003/493/EC.
  29. ^ "Aflatoxins in food". European Food Safety Authority. March 1, 2007.
  30. ^ "Research improves the control of Brazil nut contamination by mycotoxins". AGÊNCIA FAPESP. August 2, 2017.
  31. ^ "Brazil Nuts". Oak Ridge Associated Universities. January 20, 2009. Archived from the original on October 6, 2021. Retrieved December 17, 2018.
  32. ^ Adams, Rod (January 4, 2014). "BBC Bang Goes the Theory demonstrates that NOT all Brazil nuts are radioactive". Atomic Insights. Retrieved May 18, 2021.
  33. ^ "Brazil Nuts". Museum of Radiation and Radioactivity. Retrieved October 6, 2021.[permanent dead link]
  34. ^ "Biomonitoring Summary". www.cdc.gov. September 3, 2021. Retrieved October 6, 2021.
  35. ^ United States Food and Drug Administration (2024). "Daily Value on the Nutrition and Supplement Facts Labels". Retrieved March 28, 2024.
  36. ^ "Selenium". Office of Dietary Supplements, US National Institutes of Health. March 26, 2021. Retrieved July 25, 2022.
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  42. ^ a b c "Bertholletia excelsa - Bonpl". Plants for a Future. Retrieved January 28, 2023.
  43. ^ "Greenpeace Activists Trapped by Loggers in Amazon". Greenpeace. October 18, 2007. Archived from the original on December 22, 2010. Retrieved July 17, 2012.
  44. ^ Moncrieff, Virginia M. (September 21, 2015). "A little logging may go a long way". Forest News. Center for International Forestry Research. Retrieved July 8, 2020 – via CIFOR.org.
  45. ^ de Oliveira Wadt, Lucia Helena; de Souza, Joana Maria Leite. "Árvore do Conhecimento – Castanha-do-Brasil" [Tree of Knowledge – Brazil nut]. Brazilian Agricultural Research Corporation (in Brazilian Portuguese).
  46. .