Plukenetia volubilis

Plukenetia volubilis, commonly known as sacha inchi, sacha peanut, mountain peanut, Inca nut or Inca-peanut, is a perennial plant in the family Euphorbiaceae, having small trichomes on its leaves. It is native to much of tropical South America (Suriname, Venezuela, Bolivia, Colombia, Ecuador, Peru, and northwestern Brazil), as well as some of the Windward Islands in the Caribbean.[2] It is cultivated commercially in South East Asia, most notably in Thailand. Although its raw seeds and leaves contain toxins, these components are safe for consumption after roasting.[3]

Plukenetia volubilis
Fruit of Plukenetia volubilis, Ecuador
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Euphorbiaceae
Genus: Plukenetia
Species:
P. volubilis
Binomial name
Plukenetia volubilis
Synonyms[1]
  • Fragariopsis paxii Pittier
  • Plukenetia macrostyla Ule
  • Plukenetia peruviana Müll.Arg.
  • Sajorium volubile (L.) Baill.
Plukenetia volubilis - MHNT

Plukenetia volubilis should not be confused with Caryodendron orinocense, which is commonly known as inchi, cacay, or orinoconut.

Description

In the Amazon Rainforest in Peru, it has been cultivated by indigenous people for centuries, and will grow in warm climates up to altitudes of 1,700 meters (5,500 feet) as long as there is continued availability of water and good drainage. It grows better in acidic soils and alluvial flats near rivers.

The plant reaches a height of 2 metres (6' 6"), with alternate, heart shaped, serrated leaves, 10 to 12 cm long (4"-4.7") and 8 to 10 cm (3.1-3.9") wide, that have petioles 2–6 cm (0.8-2.3") long. It flowers five months after being planted, and bears seeds around the eighth month. The male flowers are small, white, and arranged in clusters. Two female flowers are located at the base of the inflorescence. In tropical locations it is often a vine requiring support and producing seeds nearly year-round.

The fruits are capsules of 3 to 5 cm in diameter with 4 to 7 points, are green and ripen blackish brown. On ripening, the fruits contain a soft black wet pulp that is messy and inedible, so are normally left to dry on the plant before harvest. By two years of age, often up to a hundred dried fruits can be harvested at a time, giving 400 to 500 seeds a few times a year. Fruit capsules usually consist of four to five lobes, but some may have up to seven. Inside are the seeds, oval, dark-brown, 1.5 to 2 cm in diameter with a mass of 45 to 100 grams. The cotyledons are open, similar to those of almonds, and covered with a whitish film. Raw seeds are inedible, but roasting after shelling makes them palatable.

The seeds of inchi have high protein (27%) and oil (35 - 60%) content, and the oil is rich in the essential fatty acids omega-3 linolenic acid (≈45-53% of total fat content) and omega-6 linoleic acid (≈34-39% of fat content), as well as non-essential omega-9 (≈6-10% of fat content).[4][5]

Phytochemicals

When raw, P. volubilis seeds and leaves contain appreciable amounts of alkaloids, saponins, and lectins which may be toxic if consumed before cooking, but are degraded by roasting.[3] The edible seed oil is a source of polyunsaturated fatty acids.[5]

Uses

The roasted seeds can be consumed as nuts, and roasted leaves chewed or made into a tea.[3]

Sacha inchi oil has a mild flavour with a nutty finish and may be appropriate for a variety of cuisines,[3] although when consumed daily after 1 week, some subjects indicated low acceptance for the oil.[6] Rich in alpha-linolenic acid,[5] the oil was evaluated in a 4 month ingestion study (10-15 ml per day) by adults, showing it was safe and tended to increase blood levels of HDL cholesterol.[6]

In Peru during 2009, the humanitarian group Oxfam supported techniques for growing sacha inchi as a cash crop by indigenous groups like the Ashaninka.[7]

  • Plukenetia volubilis (Sacha Inchi), Peru

References
  1. The Plant List: A Working List of All Plant Species, retrieved 22 April 2017
  2. Kew World Checklist of Selected Plant Families
  3. Srichamnong, W; Ting, P; Pitchakarn, P; Nuchuchua, O; Temviriyanukul, P (2018). "Safety assessment of Plukenetia volubilis (Inca peanut) seeds, leaves, and their products". Food Science & Nutrition. 6 (4): 962–969. doi:10.1002/fsn3.633. PMC 6021735. PMID 29983959.
  4. Guillén, María D.; Ainhoa Ruiz; Nerea Cabo; Rosana Chirinos; Gloria Pascual (August 2003). "Characterization of sacha inchi (Plukenetia volubilis L.) oil by FTIR spectroscopy and 1H NMR. Comparison with linseed oil". Journal of the American Oil Chemists' Society. 80 (8): 755–762. doi:10.1007/s11746-003-0768-z.
  5. Dawn Berkelaar; Tim Motis (30 October 2015). "Inca nut (Plukenetia volubilis)". ECHO Community. Retrieved 30 August 2018.
  6. Gonzales GF, Gonzales C (2014). "A randomized, double-blind placebo-controlled study on acceptability, safety and efficacy of oral administration of sacha inchi oil (Plukenetia volubilis L.) in adult human subjects". Food Chem Toxicol. 65: 168–76. doi:10.1016/j.fct.2013.12.039. PMID 24389453.CS1 maint: uses authors parameter (link)
  7. Hufstader, Chris (Winter 2009). "Looking to Sacha Inchi for their future". Oxfam Exchange. 9 (1): 2–3.
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