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Stevia rebaudiana

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Stevia rebaudiana
Stevia rebaudiana flowers
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Stevia
Species:
S. rebaudiana
Binomial name
Stevia rebaudiana

Stevia rebaudiana is a plant species in the genus Stevia of the family Asteraceae. It is commonly known as candyleaf, sweetleaf or sugarleaf.[1][2]

It is a small seasonal plant which grows to a height of 30–60 centimetres (1–2 feet).[2] It has elongated leaves that grow along the stems and are lined up against each other. The flowers are typically trimmed to improve the taste of the leaves.[3] Stevia is a tender perennial native to parts of Brazil and Paraguay having humid, wet environments.[2][3]

Stevia is widely grown for its leaves, from which extracts can be manufactured as sweetener products known generically as stevia and sold under various trade names.[4] The chemical compounds that produce its sweetness are various steviol glycosides (mainly stevioside and rebaudioside), which have 200–300 times the sweetness of sugar.[2][5] Stevia leaves contain 9.1% stevioside and 3.8% rebaudioside A.[6]

Stevia rebaudiana

Description

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Stevia rebaudiana is a perennial herb growing up to 2 ft (0.61 m) tall.[2] The flowers are white with light purple accents and no fragrance. Plants produce fruit which is ribbed spindle-shaped. Stevia prefers sandy-like soil.[2]

Chemistry

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In 1931, chemists M. Bridel and R. Lavielle isolated the glycosides stevioside and rebaudioside that give the leaves their sweet taste.[7] The exact structures of the aglycone steviol and its glycoside were published in 1955.

Cultivation

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Beginning in the 1960s,[4] commercial cultivation had spread to Japan, Southeast Asia and the US, but also in mildly tropical climates in hilly areas of Nepal or India (Assam region). The plant prefers warm, moist and sunny conditions.[2] The plant cannot survive frost during the winter and therefore greenhouses are used to grow stevia in Europe.[8]

Stevia rebaudiana is found in the wild in semiarid habitats ranging from grassland to mountain terrain, do produce seeds, but only a small percentage of the seeds germinate.

Stevia rebaudiana has been grown on an experimental basis in Ontario, Canada, since 1987 to determine the feasibility of commercial cultivation.[9] Duke University researchers developed a strategic plan to assist farmers and exporters in Paraguay to compete in the global market for stevia.[10]

Uses

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Stevia rebaudiana has been used over centuries by the Guaraní people of Brazil and Paraguay, who called it ka'a he'ẽ ("sweet herb"), to sweeten the local yerba mate tea, as medicine, and as a "sweet treat".[11]

In 1899, botanist Moisés Santiago Bertoni first described the plant as growing in eastern Paraguay, and observed its sweet taste.[12]

When extracts of its leaves are processed into a powder, stevia is used as a sugar substitute in most of the developed world.[6][13]

Based on the JECFA (Joint Expert Committee on Food Additives) declaration, safe consumption of steviol glycosides for humans is determined to be 4 mg/kg body weight per day. It was also agreed by the European Commission in 2011 for use in food in European countries. Steviol glycosides have also been accepted in the US as generally recognized as safe (GRAS).[citation needed]

Stevia leaf and raw extracts are not treated as GRAS and their import into the US is not allowed for usage as sweeteners.[14][15]

References

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  1. ^ USDA, NRCS (n.d.). "​Stevia rebaudiana​". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 3 December 2015.
  2. ^ a b c d e f g "Stevia rebaudiana". Missouri Botanical Garden. 2019. Retrieved 23 November 2019.
  3. ^ a b Petruzzello, Melissa (12 December 2017). "stevia | Description, Plant, & Sweetener". Encyclopedia Britannica. Encyclopædia Britannica, inc. Retrieved 19 November 2019.
  4. ^ a b Katie Jennings (3 July 2014). "Here's What The Stevia Sweetener Really Is – And Why Some People Think It Tastes Bad". Business Insider. Retrieved 23 November 2019.
  5. ^ Abdullateef, Raji Akintunde; Osman, Mohamad (1 January 2012). "Studies on effects of pruning on vegetative traits in Stevia rebaudiana Bertoni (Compositae)". International Journal of Biology. 4 (1). doi:10.5539/ijb.v4n1p146.
  6. ^ a b Goyal, S. K.; Samsher, null; Goyal, R. K. (February 2010). "Stevia (Stevia rebaudiana) a bio-sweetener: a review". International Journal of Food Sciences and Nutrition. 61 (1): 1–10. doi:10.3109/09637480903193049. ISSN 1465-3478. PMID 19961353. S2CID 24564964.
  7. ^ Bridel, M.; Lavielle, R. (1931). "Sur le principe sucre des feuilles de kaa-he-e (stevia rebaundiana B)". Comptes rendus de l'Académie des sciences (Parts 192): 1123–5.
  8. ^ Ramesh, K.; Singh, Virendra; Megeji, Nima W. (1 January 2006), "Cultivation of Stevia [Stevia rebaudiana (Bert.) Bertoni]: A Comprehensive Review", Advances in Agronomy Volume 89, vol. 89, Academic Press, pp. 137–177, doi:10.1016/s0065-2113(05)89003-0, ISBN 9780120008070
  9. ^ Todd J (2010). "The Cultivation of Stevia, "Nature's Sweetener"". Ontario Ministry of Agriculture and Food. Retrieved 20 March 2014.
  10. ^ Bamber, P; Fernandez-Stark, K (2012). "Strengthening the competitiveness of the stevia value chain in Paraguay" (PDF). Duke University Center on Globalization, Governance and Competitiveness. Retrieved 20 March 2014.
  11. ^ Misra, H.; Soni, M.; Silawat, N.; Mehta, D.; Mehta, B. K.; Jain, D. C. (April 2011). "Antidiabetic activity of medium-polar extract from the leaves of Stevia rebaudiana Bert. (Bertoni) on alloxan-induced diabetic rats". J Pharm Bioallied Sci. 3 (2): 242–8. doi:10.4103/0975-7406.80779. PMC 3103919. PMID 21687353.
  12. ^ Bertoni, Moisés Santiago (1899). Revista de Agronomia de l'Assomption. 1: 35. {{cite journal}}: Missing or empty |title= (help)
  13. ^ Jones, Georgia (September 2006). "Stevia". NebGuide: University of Nebraska–Lincoln Institute of Agriculture and Natural Resources. Archived from the original on 31 December 2010. Retrieved 4 May 2007.
  14. ^ Nutrition, Center for Food Safety and Applied (9 February 2019). "Additional Information about High-Intensity Sweeteners Permitted for Use in Food in the United States". FDA.
  15. ^ "Import Alert 45–06". accessdata.fda.gov. Retrieved 23 November 2019.
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