The Chemical constituents in essential oils of Pterocarpus soyauxii leaf, leaf stalk and stem bark

  • Dorcas Olufunke Moronkola Chemistry Department, University of Ibadan, Ibadan.
  • Timilehin Peter Oladapo, Mr Chemistry Department, University of Ibadan, Ibadan.
  • Fuhad Opeyemi Adegbenro
  • Oluwadamilare Oluwatimilehin Ogunbanjo Chemistry Department, University of Ibadan, Ibadan.
  • Kehinde Ololade Olayinka, Prof. Chemistry Department, University of Lagos, Lagos.


The Nigerian essential oils of fresh Pterocapus soyauxii leaf, leaf stalk and stem bark were isolated by hydro-distillation using the adapted all glass Clevenger’s apparatus designed to British Pharmacopeia specifications. Chemical compositions of the plant parts were characterized using Gas Chromatography-Mass Spectroscopy (GC-MS).

The leaf essential oil contained 12 compounds, out of which 10 were identified accounting for 93.91% of it. Leafstalk oil had 20 major compounds, which were characterised; they constitute 95.47% of the oil. 11 compounds make up 78.61% of stem bark oil, out of which 7 were characterised, responsible for 76.30% of it.

Prominent compounds in the leaf oil were cembrene (43.59%), a monocyclic diterpenoid, eremophilene (29.72%), and azulene derivatives (6.62%), which are polycyclic aromatic compounds. Leaf stalk oil was dominated by hexadecane (32.97%), cis- and trans- β-ocimene (11.60 and 7.74% respectively) and heptanol (8.39%). Major compounds in stem bark oil were neophytadiene (22.11%), 2-heptanol (19.27%) and 3,7,11,15-Tetramethyl-2-hexadecene-1-ol (14.35%). Other prominent compounds in the stem bark oil are 4-propyl-cyclohexene (4.83%), 3-Eicosyne (7.63%), 3,7,11-trimethyl-14-(1-methylethyl-[S-(E,Z,E,E)]-1,3,6,10-cyclodecatetraene (5.10%) and methyl-Z-5,8,11,14,17-Eicosapentaenoate (3.01%).

Notable compounds of biological importance and in appreciable amounts in the oils include phytol (6.93%), squalene (1.14%) and ambrial (1.97%). Fragmentation patterns in the mass spectrum of some unidentified compounds are also presented which are unique features of the oils.

Interesting classes of compounds in the three oils include monoterpenes, sesquiterpenes, diterpenes, naphthalenes, alcohols and hydrocarbons.


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2. Burkill HM, The useful plants of West Tropical Africa. Families J–L.2nd ed. Volume 3, Royal Botanic Gardens, Kew, Richmond, United Kingdom. 1995. P. 857.
3. Surowiec I, Nowik W, Trajanowicz M, Identification of ‘insoluble’ red dyewoods by high performance liquid chromatography – photodiode array detection (HPLC-PDA) fingerprinting. Journal of Separation Science, 2004; 27:209–216.
5. Lainé C., Baniakina J., Vaquette J., Chaumont J.P. & Simeray J., Antifungal activity of the barks of trunks of seven phanerogams from the Congo. Plantes Médicinales et Phytotherapie 1985; 19(2):75–83.
6. Nzokou, P. & Kamdem D.P., Fungal decay resistance of non-durable aspen wood treated with extractives from African padauk (Pterocarpus soyauxii). Journal of Tropical Forest Products 2003; 9(1–2):125–133.
8. Arnone A., Camarda L., Merlini L., Nasini G. & Taylor D.A.H. Coloring matters of the West African red woods Pterocarpus osun and P. soyauxii. Structures of santarubin A and santarubin B. Journal of the Chemical Society Perkin Transactions I. Organic and Bio-organic Chemistry 1977; 19:2116–2118.
9. Birch A. J.; Brown W. V.; Corrie J. E. T.; Moore B. P. "Neocembrene-A, a termite trail pheromone". Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry. 1972; 21:2653–2658. doi:10.1039/p19720002653.
10. Terpenes: Flavors, Fragrances, Pharmaca, Pheromones, Eberhard Breitmaier, page 7. ISBN 978-3-527-31786-8.
12. Vencata Raman B, Samuel LA, Pardha Saradhi M et al., “Antimicrobial, antioxidant activity and GC-MS analysis of Eupatorium odoratu,” Asian Journal of Pharmaeutical and clinical Research, 2012; 5(2):99-106.
13. Netscher Thomas. "Synthesis of Vitamin E". In Litwack, Gerald. Vitamin E. Vitamins & Hormones. 2007; 76:155–202. doi:10.1016/S0083-6729(07)76007-7. ISBN 978-0-12-373592-8.
14. Daines, Alison; Payne, Richard; Humphries, Mark; Abell, Andrew. "The Synthesis of Naturally Occurring Vitamin K and Vitamin K Analogues". Current Organic Chemistry. 2003; 7(16):1625–34.
15. Vencl Fredric V.; Morton Timothy C. (1998). "The shield defense of the sumac flea beetle, Blepharida rhois (Chrysomelidae: Alticinae)". Chemoecology. 8 (1): 25–32. doi:10.1007/PL00001800
16. Bloch Konrad E. "Sterol, Structure and Membrane Functio". Critical Reviews in Biochemistry and Molecular Biology. 1983; 14:47–92. doi:10.3109/10409238309102790.
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How to Cite
Moronkola, D., Oladapo, T., Adegbenro, F., Ogunbanjo, O., & Olayinka, K. (2019). The Chemical constituents in essential oils of Pterocarpus soyauxii leaf, leaf stalk and stem bark. Journal of Drug Delivery and Therapeutics, 9(2), 206-211.