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Family Arecaceae / Palmae
African oil palm
Elaeis guineensis Jacq.

You zong

Scientific names Common names
Elaeis dybowskii Hua African oil palm (Engl.)
Elaeis guineensis Jacq. Macaw fat tree (Engl.)
Elaeis macrophylla A.Chev.                   [Invalid] Oil palm tree (Engl.)
Elaeis madagascariensis A(Jum. & H.Perrier) Becc. Palm kernel oil (Engl.)
Elaeis melanococca Gaertn.  
Elaeis virescens (A,Chev.) Prain  
Palma oleosa Mill.  
Elaeis guineensis Jacq. is an accepted name The Plant List

Other vernacular names
ARABIC: Nakhlet ez zayt.
BURMESE: Si htan, Si ohn.
CAMBODINA: Doong preeng.
CHINESE: You zong, You ye zu.
COOK ISLANDS: Nu tamara.
DANISH: Oliepalme.
FINNISH: Öljypalmu.
FRENCH: Palmier à huile, Palmier à huile d'Afrique.
GERMAN: Afrikanische Ölpalme, Oelpalme.
INDONESIA: Kelapa sawit; Salak minyak.
ITALIAN: Palma avoira, Palma da olio, Palma oleaginosa africana.
JAPANESE: Abura yashi.
MALAY: Kelapa sawit, Kelapa sawit Bali.
PORTUGUESE: Caiaué (Brazil), Dendenzeiro, Palmera dendém.
RUSSIAN: Gvineiskaia, Maslichnaia pal'ma, Pal'ma maslichnaia.
SPANISH: Corojo de Guinea, Palma africana, Palma oleaginosa africana, Palmera de aceite.
SWAHILI: Mchikichi, Miwesi, Mjenga.
SWEDISH: Oljepalm.
THAI: Paam nam man.
VIETNAMESE: Co dau; Dua da.

Oil palm tree has an erect trunk reaching a height of 4 to 10 meters. Leaves are numerous, 3 to 4.5 meters long. Petioles are broad, armed on the sides with spinescent, reduced leaves. Leaflets are numerous, linear-lanceolate, nearly 1 meter long, 2 to 4 centimeters wide. Male inflorescence is dense, having numerous, cylindric spikes which are 7 to 12 centimeters long and about 1 centimeter in diameter; the rachises excurrent as a stout awn. Female inflorescence is dense, branched, 20 to 30 centimeters long, the flowers densely disposed. Fruit is borne in large dense masses.

- Introduced sometime in the middle of 19th century.
- Ornamental cultivation in Manila and larger towns.

- Seeds of improved strain introduced by Dr. Eduardo Quisumbing in 1938 from Kuala Lumpur.
- Grown extensively in West Africa, its original home, and in Malaya, Sumatra, Java, India, and the United States.

- Palm yields two kinds of oil: the palm oil and palm-kernel oil.
- Palm oil consists principally of palmitin and olein, used primarily in the manufacture of soaps and candles.
- The palm kernel oil consists chiefly of glyceride of lauric acid, together with palmitic, oleic and myristic acids, some caprylic acid, capric acid and phytosterin, and used for making vegetable butter.
- Phytochemical screening of oil palm leaves yielded phenolic compounds such as flavonoids, tannins, coumarins, alkaloids, saponins, terpenoids, steroids, and carbohydrates. (see study below) (17)
- Proximate analysis of methanolic extracts showed flavonoids as main constituents highest in oil palm leaves (257.00 ± 3.055 mg QE/g DW). (see study below) (17)
- Analysis of lipid and sterol composition of the pollen yielded triglycerides, esterified and free sterols and trace amounts of hydrocarbons from the neutral lipid fraction. Major fatty acids were linoleic, palmitic, linolenic acids with small to trace amounts of oleic, stearic, arachidic, myristic, lauric, palmitoleic and margaric acids.

- Considered vulnerary, laxative, diuretic.
- Antioxidant, antimicrobial, anticancer, hepatoprotective, wound healing.

Parts used
Oil, fruits, roots, sap.


- Edible palm heart and fruit.
- Sap from inflorescence used to make wine and sugar.
- Not known medicinally in the Philippines.
- In Guinea, oil is applied to wounds as a vulnerary.
- Used as a liniment for rheumatism.
- Decoction of root or burnt powder of root taken orally to treat epilepsy.
- Infructesence mixed with ginger burned and applied as enema to young children to encourage walking at an early age.
- The Bubis of the Island of Fernando Po make a poultice made from oil which is applied to wounds.
- In Equatorial West African, roots used as diuretic and fresh sap as laxative.
- In South Eastern Nigeria, used for treatment of various diseases and skin infections.
- Oil: Palm oil chiefly used in the manufacture of soaps and candles. The palm-kernel oil is used for making vegetable butter.
- Wine: In Aftrica, wine made from the trees.

- Ritual: Inflorescence burned to drive away bad spirits. Seed nut used in oracle rituals for diagnosis of illness and fate dreams. (17)

Palm oil
• Oil palm is considered the highest yielding oil-bearing crop.
• Oil is extracted from the fruit pulp (palm oil) and the kernel (palm kernel oil). For every 100 kg of fruit bunches, 22 kg of palm oil and 1.6 kg of palm kernel oil can be extracted.
• It has a high oil yield (7,259 liters per hectare per year), high levels of natural antioxidant, and comparatively cheaper pricing.
• It has more saturated fats than canola, corn linseed, soybean, safflower and sunflower oils and can withstand deep-fry heat, with a resistance to oxidation.

Wound Healing / Antimicrobial:
Phytochemical screening yielded tannins, alkaloids, steroids, saponins, terpenoids and flavonoids. The extract showed significant activity against C albican. Results show a potent wound healing capacity as evidenced by better wound closures, improved tissue regeneration and histopath evidence, with a significant reduction of microbial count. (2)
Traditionally extracted palm oil and palm kernel oil, tested individually on five microorganisms - S aureus, E coli, P aeruginosa, C albicans and A niger
- showed inhibition. When the extracts were mixed, only E coli was minimally inhibited. (3) Study methanol extract of oil palm leaf for showed significant antimicrobial activity against Gram positive and Gram negative bacteria and yeast and fungi tested. (18)
Lipid Oxidation: Supplementation of palm oil as an antioxidant to a certain extent reduced lipid oxidation in healthy rats; but worsened or not significantly inhibited in diabetic rats. (4)
Hepatoprotective: Study evaluated the hepatoprotective activity of E. guineensis against paracetamol- induced liver injury in mice through serum analysis. Mice treated with leaf extract showed significant decline in ALT, AST, and bilirubin levels. The hepatoprotection was attributed to an antioxidant activity.   (8)
Wound Healing / Leaf Extract Ointment: Study of E. guineensis leaf extract showed potent wound healing capacity as evidenced by better wound closure, improved tissue regeneration, together with histopath improvement. (10)
Antihypertensive and Cardiovascular Effects / Catechin-Rich: Study evaluated the catechin-rich oil palm leaf extract (OPLE) for antioxidant, antihypertensive, and cardiovascular effects in normal and NO-deficient hypertensive rats. Results showed significant attenuation of blood pressure increases, increased serum NO, reduced lipid peroxidation, and antioxidant effects. (11)
Cytotoxicity / Anti-Cancer: Study evaluated the cytotoxic effects of a methanol extract on MCF-7 and Vero cell. Results showed significant cytotoxic effects on MCF-7, suggesting a potential use of the extract in preparing recipes for cancer-related ailments. (12)
Antioxidant / Renoprotection in Diabetes: Results of study of oil palm leaf extract (OPLE) showed improvement in renal dysfunction and pathology in diabetes. Renoprotection was via catechin-rich OPLE modulation of oxidative stress caused by hyperglycemic-induced generation of free radicals in the diabetic kidney and prevention of renal dysfunction and structural injury. (13)
Acute Toxicity Study / Brine-Shrimp Lethality: Acute oral toxicity and brine shrimp lethality of a methanolic extract was tested. Results showed E. guineensis is nontoxic and safe for commercial utilization. (14)
Antioxidant / Antimicrobial / Leaves: Study evaluated extracts of oil palm leaves for antioxidant and antibacterial activity. Antioxidant evaluation using DPPH assay showed great antioxidant activity from the methanolic extracts with IC50 value of 0.646 mg/mL. Antibacterial activity showed the methanol extract to have broad spectrum activity against all tested bacteria with inhibition zone of 7.7-11.3 ± 0.0 -1.0 mm. (see constituents above) (16)
Anti-Aging / Antioxidant / Leaves: Study screened methanol extracts of leaves for antioxidant activity by DPPH (IC50 814 µg/ml), XOI (534.04 µg/mL), NOS 37.48 µg/mL), and HPSA (1052.02 µg.mL) assays. Total phenolic content was o.33 mg gallic equivalent (GAE) per gram of dry extract. Results suggest a potential as an anti-aging agent, with high bioaccessibility and bioavailabiity throughout the country. (19)
Toxicity Study / Leaves: Study evaluated the acute toxicity of a caechin-rich oil palm (E. guineensis) leaf extract. No observed adverse effects were seen at 2 gm dose. There was no death even at 5 g dose, and the acute toxic injuries appeared reversible. (20)
Antioxidant / Pro-Oxidant Effects / Leaves: Study evaluated the antioxidant and pro-oxidant effects of chronically administered high doses (1000 mg kg) of leaf extract in an animal model of diabetic nephropathy. Results showed chronic administration for four weeks attenuated renal dsyfunction and development of glomerulosclerosis and tubulointerstitial fibrosis, features that are associated with DN. Suppression of increases in oxidative stress markers and fibrotic cytokine was observed. In contrast, OPLE adminstered for 12 weeks caused worsening of renal dysfunction, accompanied by an increase expression of one of the NADPH oxidase subunits p22phcx. Results suggest the unfavorable effects of prolonged treatment with 1000 mf/kg were accompanied by increase expression of one of the NADPH oxidase subnits. (21)

Commercially, as oil products.
Pellets, tinctures, dilutions in the cybermarkets.

Godofredo U. Stuart Jr., M.D.

Last Updated February 2016

IMAGE SOURCE / Public Domain / File:Koeh-056.jpg / Franz Eugen Köhler / Köhler's Medizinal-Pflanzen / 1897 / Wikimedia Commons
OTHER IMAGE SOURCE: Photo of (1) tree and (2) Cross section of an oil palm fruitlet from: ./etawau.com/OilPalm/Elaeis_guineens.htm / Click on image to go to source page

Additional Sources and Suggested Readings
Oil palm / Wikipedia
Wound Healing Potential of Elaeis guineensis Jacq Leaves in an Infected Albino Rat Model / Sreenivasan Sasidharan, Rajoo Nilawatyi et al / Molecules 2010, 15(5), 3186-3199; doi:10.3390/molecules15053186
ANTIMICROBIAL EFFECTS OF PALM KERNEL OIL AND PALM OIL / Ekwenye, U N and Ijeomah C A / KMITL Sci. J. Vol. 5 No. 2 Jan-Jun 2005
EFFECTS OF THE OIL PALM (Elaeis guineensis Jacq.) ON LIPID OXIDATION IN STREPTOZOTOCIN-INDUCED DIABETIC RATS/ Lim Chin Choon / International Islamic Univerisity Malaysia / 2008
Lipid and sterol composition of the pollen of the west african oilpalm, Elaeis guineensis / F I Opute / Phytochemistry, Volume 14, Issue 4, April 1975, Pages 1023-1026 / doi:10.1016/0031-9422(75)85180-6
Edible Palms and Their Uses / Jody Haynes & John McLaughlin / Quisqualis
Sorting Elaeis names / Maintained by: Michel H. Porcher / MULTILINGUAL MULTISCRIPT PLANT NAME DATABASE / The University of Melbourne. Australia / Copyright © 1997 - 2000 The University of Melbourne.
Hepatoprotective Potential of Elaeis Guineensis Leaf Against Paracetamol Induced Damage in Mice: A Serum Analysis / Sreenivasan Sasidharan+, Soundararajan Vijayarathna, Subramanion L Jothy, Kwan Yuet Ping and Lachimanan Yoga Latha / 2012 International Conference on Nutrition and Food Sciences IPCBEE vol. 39 (2012) © (2012)
Elaeis guineensis Jacquem. / Chinese names / Catalogue of Life, Chiina
Wound Healing Activity of Elaeis guineensis Leaf Extract Ointment / Sreenivasan Sasidharan,* Selvarasoo Logeswaran, and Lachimanan Yoga Latha / Int J Mol Sci. 2012; 13(1): 336–347 / doi: 10.3390/ijms13010336
Antihypertensive and Cardiovascular Effects of Catechin-Rich Oil Palm (Elaeis guineensis) Leaf Extract in Nitric Oxide–Deficient Rats / Juliana M. Jaffri, Suhaila Mohamed, Nordanial Rohimi, Intan N. Ahmad, M. Mustapha Noordin, and Yazid A. Manap/ JOURNAL OF MEDICINAL FOOD J Med Food 14 (7=8) 2011, 775–783 / DOI: 10.1089=jmf.2010.1170
Cytotoxicity of methanol extracts of Elaeis guineensis on MCF-7 and Vero cell lines /
Soundararajan Vijayarathna, Sreenivasan Sasidharan* / 826 Asian Pac J Trop Biomed 2012; 2(10): 826-829 / doi:10.1016/S2221-1691(12)60237-8
Chronic Administration of Oil Palm (Elaeis guineensis) Leaves Extract Attenuates Hyperglycaemic-Induced Oxidative Stress and Improves Renal Histopathology and Function in Experimental Diabetes / Varatharajan Rajavel, Munavvar Zubaid Abdul Sattar, Mahmood Ameen Abdulla, Normadiah M. Kassim and Nor Azizan Abdullah / Evidence-Based Complementary and Alternative Medicine, Volume 2012 (2012), / doi:10.1155/2012/195367
Acute Oral Toxicity and Brine Shrimp Lethality of Elaeis guineensis Jacq., (Oil Palm Leaf) Methanol Extract
Abdul Rani Muhamad Syahmi, Soundararajan Vijayarathna, Sreenivasan Sasidharan,* Lachimanan Yoga Latha, Yuet Ping Kwan, Yee Ling Lau, Lai Ngit Shin and Yeng Chen / Molecules 2010, 15, 8111-8121; doi:10.3390/molecules15118111
Elaeis guineensis Jacq. / Synonyms / The Plant List
Ritual uses of palms in traditional medicine in sub-Saharan Africa: a review
/ Marta Gruca, Tinde R van Andel and Henrik Balslev / Journal of Ethnobiology and Ethnomedicine201410:60 / DOI: 10.1186/1746-4269-10-60
Antimicrobial Activity of Elaeis Guineensis Leaf / K.H. Chong, Z. Zuraini, S. Sasidharan,*, P.V. Kalnisha Devi / L. Yoga Latha and S. Ramanathan / Pharmacologyonline 3: 379-386 (2008)
Antioxidant Activity of Elaeis guineensis Leaf Extract: An Alternative Nutraceutical Approach in Impeding Aging / Vijayarathna Soundararajan, Sasidharan Sreenivasan / APCBEE Procedia, Volume 2, 2012, Pages 153–159
Acute toxicity and safety assessment of oil palm (Elaeis guineensis Jacq.) leaf extract in rats / Victor Uchenna Anyanji*, Suhaila Mohamed and Hair Bin Bejo / Journal of Medical Plant Research, Vol. 7(16), pp. 1022-1029, 25 April, 2013 DOI 10.5897/JMPR12.0001
Antioxidant and pro-oxidant effects of oil palm (Elaeis guineensis) leaves extract in experimental diabetic nephropathy: a duration-dependent outcome / Rajavel Varatharajan, Munavvar Zubaid Abdul Sattar, Ivy Chung, Mahmood Ameen Abdulla, Normadiah M Kassim and Nor Azizan Abdullah* / BMC Complementary and Alternative Medicine 2013, 13:242 / doi:10.1186/1472-6882-13-242

It is not uncommon for links on studies/sources to change. Copying and pasting the information on the search window or using the DOI (if available) will often redirect to the new link page.

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