Description

Solanum macrocarpon L., commonly known as African eggplant, gboma eggplant, or Vietnamese white eggplant, is a flowering plant species in the nightshade family Solanaceae (the same family as tomato, potato, common eggplant, and pepper). It is a tropical perennial plant closely related to the common eggplant (Solanum melongena) . The plant originated from West Africa but is now widely distributed in Central and East Africa, as well as parts of the Caribbean, South America, and Southeast Asia.

Morphology: The plant is an erect, often much-branched, annual to perennial herb or shrub that typically grows up to 1.5 meters (5 feet) in height . The stems may sometimes be dark purple, with dense to sparse stellate (star-shaped) hairs. A distinctive feature is the presence of straw-colored prickles (spines) that can reach up to 18 mm long, though some cultivated forms may be unarmed.

Leaves: The leaves are solitary, sometimes purple-tinged, ranging from 5–41 cm in length and 2–25 cm in width. They are ovate to obovate (egg-shaped) with a broadly cuneate to attenuate base that often extends downward along the petiole (leaf stalk) . The leaf margins are deeply sinuate-pinnatifid to sinuate-repand (wavy to lobed), with triangular or ovate-triangular lobes. The leaves may be hairy or glabrous (smooth) and often bear prickles mainly on the midrib and secondary veins.

Flowers: The inflorescences are lateral, unbranched cymes bearing 2–6 flowers . The lower flowers in the cluster are typically bisexual, while the upper ones tend to be male . The flowers are 5-merous (rarely 6-merous), with a calyx that is densely covered with stellate hairs and often prickly. The corolla (petals) ranges from bluish to purple or occasionally white, measuring 1.6–2.5 cm across, and is broadly campanulate (bell-shaped) to rotate-stelliform.

Fruit: The fruit is a glossy berry that is initially green-white, turning yellow, golden-yellow, or orange-yellow at maturity. It is globose or depressed-globose (flattened), measuring 3–4 cm in diameter or 3–4 × 3.5–4.5 cm. The flesh is firm like a persimmon but smells like a tomato; it is moist but not juicy except around the seeds. Immature fruits are green or white. Each fruit contains 50–100 seeds.

Seeds: The seeds are pale yellow-brown or yellowish, 3–4 × 2.5–3 mm, oblique or flattened lenticular (lens-shaped) to subreniform (somewhat kidney-shaped), with a conspicuously reticulate (net-like) surface.

Note on Taxonomy: Solanum macrocarpon is closely related to Solanum dasyphyllum, and many botanists consider the two to be conspecific (the same species), with S. macrocarpon representing the cultivated forms and S. dasyphyllum the wild ancestor .

 Common Names

• English: African Eggplant, Gboma, Gboma eggplant, Vietnamese white eggplant, Large-Fruited Eggplant
• French: Aubergine africaine, Aubergine gboma, Grosse anghive, Anghive
• Portuguese: Beringela africana, Berinjela africana
• German: Afrikanische Aubergine
• Swedish: Afrikansk äggört
• Yoruba: Igbagba
• Igbo: Ipere Ibo, Añara or Anara uku (sometimes shared with related species).
• Ghana: Etruopue, Ntoropo
• Sierra Leone: Busiburaxe, Kabate, Kabeli, Kpola, Kpoloi, Paili
• Uganda: Ntengo, Nume ya Kyalo
• Vietnam: Cà pháo

Health Benefits

Solanum macrocarpon is nutritious, particularly the leaves, which are richer in protein, minerals (calcium, potassium, iron, magnesium), and vitamins than the fruits. It contains bioactive compounds such as flavonoids, polyphenols, tannins, saponins, alkaloids (including glycoalkaloids like solamargine and solasonine), and antioxidants.

1. Nutritional Composition: Both the leaves and fruits of S. macrocarpon are highly nutritious.

Mineral Content (Leaves – mg/100g):

Mineral	Content (mg/100g)
Potassium (K)	2,289 – 4,596
Calcium (Ca)	1,704 – 1,965
Magnesium (Mg)	High levels recorded
Iron (Fe)	Substantially high

Data from Ojo et al., 2015 and Sereno et al., 2018

The calcium and potassium levels in S. macrocarpon leaves are significantly higher than those found in common foods like sesame seeds (1,450 mg/100g calcium) and bananas (261–546 mg/100g potassium) .

Mineral Content (Fruits – mg/100g):

Mineral	Content (mg/100g)
Potassium (K)	374.1
Calcium (Ca)	23.30 – 37.70

Data from Ojo et al., 2015

Comparison with Other Solanum Species:

When compared to other eggplants (S. melongena, S. torvum, S. incanum), S. macrocarpon demonstrates superior or comparable mineral content, particularly in calcium and potassium .

Proximate Composition (Leaves):

Component	Content
Moisture	89.7%
Protein	4.3%
Fat	0.6%
Crude Fiber	1.4%
Ash	1.3%

Data from Oboh, 2004

• Bioactive Compounds: S. macrocarpon contains diverse beneficial phytochemicals, with higher concentrations typically found in the leaves :
• Polyphenols and Flavonoids: Potent antioxidant compounds
• Tannins and Saponins: Known for antimicrobial and immune-modulating properties
• Alkaloids and Steroids: Contribute to various pharmacological effects
• Quinones: Additional bioactive compounds with medicinal potential

These compounds give the plant its potent antioxidant capacity, protecting the body from free radical damage and diseases related to inflammation, cardiovascular issues, and cancer.

• Antioxidant Properties: The high concentration of polyphenols, flavonoids, and other phenolic compounds in S. macrocarpon provides strong antioxidant activity. This helps reduce oxidative stress, which is implicated in aging, chronic inflammation, and the development of various diseases including cancer and cardiovascular disorders.
• Anti-inflammatory Effects: S. macrocarpon has demonstrated significant anti-inflammatory properties in scientific studies. This supports its traditional use in treating inflammatory conditions such as rheumatism, gout, and angina.
• Antibacterial Activity: The plant exhibits notable antibacterial effects against various pathogens, contributing to its traditional use for treating infections.
• Blood Pressure Regulation: The exceptionally high potassium content (4,596 mg/100g in leaves) makes S. macrocarpon valuable for blood pressure management. Potassium helps counteract the effects of sodium and relaxes blood vessel walls, potentially reducing hypertension.
• Diabetes Management: Research suggests that S. macrocarpon may play a role in diabetes management, possibly through its fiber content and bioactive compounds that influence glucose metabolism.
• Obesity and Weight Management: The plant has been studied for its potential role in obesity management, likely due to its fiber content and effects on metabolism.
• Cardiovascular Health: Beyond blood pressure regulation, S. macrocarpon has shown promise in managing hypercholesterolemia (high cholesterol). Studies indicate that the vegetable effectively suppresses experimental hypercholesterolemia, suggesting a protective role in cardiovascular diseases.
• Organ Protection (Hepatic and Renal): Some studies have indicated potential hepatoprotective (liver-protecting) and renal (kidney) benefits.
• Stress Relief: The plant has documented stress-relieving properties, which may be attributed to its nutrient and bioactive composition.
• Bone Health Support: The exceptionally high calcium content in the leaves (up to 1,965 mg/100g) makes S. macrocarpon valuable for maintaining bone health and preventing osteoporosis.
• Neuroprotective and Cognitive Support: Preliminary studies suggest benefits for anxiety, cognition, and oxidative stress in the brain.

 Other benefits

• Economic importance: S. macrocarpon is widely cultivated as a food crop across tropical Africa and parts of Asia and South America, contributing to local economies and food security .
• Ornamental use: The plant is sometimes used as an ornamental due to its attractive foliage and colorful fruits.
• Research significance: The plant serves as a subject for studies on glycoalkaloid management, detoxification methods, and sustainable agricultural practices .
• Agricultural resilience: The plant thrives during rainy seasons in Nigeria and other tropical regions, providing a reliable food source when other vegetables may be scarce.
• Culinary: Leaves and fruits add variety to diets as a leafy vegetable and fruit vegetable.

How it is used

Culinary uses:

Nigerian and West African Preparations:

• Leafy Vegetable: The leaves are widely used as a soup condiment in Nigeria, either in processed or unprocessed forms. They are added to soups and stews such as egusi soup, vegetable soup, and yam porridge.
• Processing Before Use: Fresh leaves are typically subjected to processing techniques including soaking, blanching, or abrasion with or without salt to reduce bitterness and antinutrient content.

Global Culinary Uses:

• Fruits: The sour immature fruit is often cooked in soups or sauces; it can also be eaten raw in salads in some regions .
• Shoots and Leaves: In Africa, the fruits, shoots, and leaves are all consumed as vegetables.
• Sarawak (Malaysia): The fruit is popularly cooked with fish or coconut milk.
• Indonesia: The fruits are eaten cooked with rice.
• Preparation Methods: In West Africa, fruits are commonly peeled, boiled, and fried to accompany meat or fish.

Traditional medicinal uses:

The plant has extensive applications in traditional medicine across Africa:

• Respiratory Conditions: Used to treat asthma, allergic rhinitis, and bronchitis.
• Skin Diseases: Applied to treat infections, ulcers, and inflammatory skin conditions.
• Pain Management: The root is used against body aches and rheumatism.
• Gout and Angina: Juice from the vegetable is used in the treatment of gout, rheumatism, and angina.
• Wound Healing: The root is used to cure wounds.
• Dental Care: The seeds are used to treat toothache; flowers and fruits are sometimes chewed to clean teeth.
• Sedative: In Nepal, the plant is used as a sedative.
• Cognitive Health: Moroccan traditional medicine uses it to stimulate memory.
• Laxative and Cardiac Issues: Fruits are used as a laxative and to treat heart problems.
• Childbirth Anaesthesia: Traditionally used as childbirth anesthesia in some regions.
• Cancerous Tissues and Parkinson’s Disease: The juice has been used to treat inflammatory tumors, cancerous tissues, and Parkinson’s disease (traditional use, not clinically proven).

Preparation methods for medicinal use:

• Infusion: Leaf infusions are prepared for various treatments, including haemolysis studies .
• Topical application: Crushed leaves or root preparations are applied externally for wounds, skin diseases, and pain.

Side Effects / Caution

1. High Glycoalkaloid Content (Critical Safety Concern): This is the most important safety consideration for Solanum macrocarpon. The fruits contain very high levels of the glycoalkaloids α-solamargine (124–197 mg/100g) and α-solasonine (16–23 mg/100g) .
   1. Comparison to Safe Levels: The glycoalkaloid levels in S. macrocarpon fruits are 5–10 times higher than the value considered safe for human consumption (generally accepted as <20-30 mg/100g total glycoalkaloids).
   1. Comparison to Common Eggplant: Solanum melongena (common eggplant) contains only 0.58–4.56 mg/100g of α-solamargine and 0.17–1 mg/100g of α-solasonine. S. macrocarpon has orders of magnitude higher levels.
2. Toxicity Concerns: Glycoalkaloids can cause gastrointestinal disturbances (nausea, vomiting, diarrhea) and neurological symptoms in sufficient quantities. The presence of these compounds poses toxicity concerns, necessitating proper processing and cooking before consumption.
3. Processing is Essential: The leaves should be properly processed (soaking, blanching, cooking) to reduce glycoalkaloid and antinutrient levels. Traditional processing methods significantly decrease cyanide and phytate content .
4. Haemolytic Effects (Blood-Related): The infusion of eggplant leaves has been shown to induce the haemolysis (rupture) of human red blood cells in vitro. Notably, blood type SS (sickle cell) was more susceptible to haemolysis than types AA and AS . This finding requires further investigation but suggests caution for individuals with sickle cell disease.
5. Antinutrient Content: Unprocessed leaves contain some antinutrients including phytates (40.4 mg/100g) and cyanide (2.0 mg/kg), though these are reduced by conventional food processing techniques .
6. Toxicity to Animals: All parts of S. macrocarpon except the fruit have been reported to cause upset stomach, heart failure, drooling, and lethargy in dogs . Keep away from pets.
7. Toxicity Studies Provide Some Reassurance: Despite the high glycoalkaloid levels, acute toxicity studies on Wistar rats showed that neither leaves nor fruits of this vegetable demonstrated toxicity at tested levels. Both leaves and fruits were found to be safe for consumption in these animal studies .
8. Cytotoxicity Studies: Separate studies using shrimp larvae (Artemia salina) found that leaves and fruits of S. macrocarpon were not toxic for the range of concentrations explored, suggesting they can be used both in traditional medicine and nutrition without immediate or medium-term major risks .
9. Pregnancy and Lactation: Due to limited safety data and the presence of potentially toxic glycoalkaloids, medicinal use of S. macrocarpon during pregnancy and breastfeeding should be avoided. Normal dietary consumption after proper cooking is generally considered acceptable but should be moderate.
10. Drug Interactions: Given the plant’s potential effects on blood pressure, blood sugar, and cholesterol, individuals on medications for hypertension, diabetes, or hyperlipidemia should consult a healthcare provider before using therapeutic amounts.
11. Cultivar Variation: The toxicity levels may vary between different cultivars of S. macrocarpon. Some cultivars (more glabrous types) are used primarily for their leaves, while more pubescent types produce larger, less bitter fruits .
12. Moderation is Key: As with all foods containing natural toxins, moderation is essential. The plant has been consumed traditionally for centuries, but proper preparation methods must be followed.

References

• “Solanum macrocarpon L.” Plants of the World Online, Royal Botanic Gardens Kew, powo.science.kew.org/taxon/urn:lsid:ipni.org:names:819941-1. Accessed 5 May 2026.
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• “Solanum macrocarpon L.” World Flora Online, www.worldfloraonline.org/taxon/wfo-0001029263. Accessed 5 May 2026.
• “Solanum macrocarpon L.” World Species, worldspecies.org/ntaxa/1884354. Accessed 5 May 2026.
• “Solanum macrocarpon.” NParks Flora & Fauna Web, National Parks Board Singapore, www.nparks.gov.sg/florafaunaweb/flora/7/2/7208. Accessed 5 May 2026.
• “Solanum Macrocarpon.” Wikipedia, https://en.wikipedia.org/wiki/Solanum_macrocarpon. Accessed 5 May 2026.
• Anh, T. T. M., et al. “Solanum macrocarpon L.: Nutritional Value, Bioactive Compounds, and Applications in Food and Medicine.” Food Science and Preservation, vol. 32, no. 4, 2025, pp. 579-594.
• Anh, T. T. M., et al. “Solanum macrocarpon L.: Nutritional Value, Bioactive Compounds…” Korean Journal of Food Preservation, 2025. Accessed 5 May 2026.
• Dougnon, Victorien Tamègnon, et al. “Acute Toxicity of Solanum macrocarpon Linn (Solanaceae) on Wistar Rats: Study about Leaves and Fruits.” ResearchGate, 2013, www.researchgate.net/publication/279476116.
• Food and Agriculture Organization. Traditional Vegetables in Africa. FAO, 1988.
• Grubben, G. J. H., and O. A. Denton, editors. Plant Resources of Tropical Africa 2: Vegetables. PROTA Foundation, 2004.
• Lester, R. N., and Daunay, M. C. “Diversity of African Solanum Vegetables.” Acta Horticulturae, vol. 745, 2007, pp. 25–31.
• Oboh, G. “Nutritional and Haemolytic Properties of Eggplants (Solanum macrocarpon) Leaves.” Journal of Food Composition and Analysis, vol. 18, no. 2-3, 2005, pp. 153-160. ScienceDirect, doi:10.1016/j.jfca.2003.12.004.
• Oboh, G., et al. “Nutritional and Haemolytic Properties of Eggplants (Solanum macrocarpon).” Food and Chemical Toxicology, 2005. (via ScienceDirect). Accessed 5 May 2026.
• Okesola, M. A., et al. “Effect of Solanum macrocarpon Linn Leaf Aqueous Extract…” PMC, 2020. Accessed 5 May 2026.
• References (MLA Format)
• Sánchez-Mata, María de Cortes, et al. “Alpha-solasonine and Alpha-solamargine Contents of Gboma (Solanum macrocarpon L.) and Scarlet (Solanum aethiopicum L.) Eggplants.” Journal of Agricultural and Food Chemistry, vol. 58, no. 9, 2010, pp. 5502-5508. TIND, worldveg.tind.io/record/38341.
• Schippers, R. R. African Indigenous Vegetables: An Overview of the Cultivated Species. Natural Resources Institute, 2000.
• World Health Organization. WHO Monographs on Selected Medicinal Plants. WHO Press, 1999.