Usman L. Ajao

 

Usman L. Ajao, B.Sc(Ed), M.Sc. (Ilorin), Ph.D(Ogbomoso)

Status: Senior Lecturer 
Tel:  +2348035032378
E – mails: This email address is being protected from spambots. You need JavaScript enabled to view it.This email address is being protected from spambots. You need JavaScript enabled to view it.This email address is being protected from spambots. You need JavaScript enabled to view it. 
Research Interest: Natural Products and Food Chemistry
On – going research:  Characterisation and Biological activities of Nigerian grown medicinal plants


  1. Ameen, O. M.; Fatope, O. M.; Usman, L. A. and Adebayo S. A. (2005); “Bioactive metabolites in improved cowpea seeds” African Journal of Biotechnology (AJB), 4(6): 513 – 519. Published by Academic Journals of Nairobi Kenya, available online at http://vwww.academicjournals.org/AJB
  2. Ogunwade, I. A., Olawore, N. O. and Usman, L. A. (2005) Composition of the Leaf oil of Centhratherum punctatum CASS Growing in Nigeria, Journal of Essential oil Research, 17, pp 496 – 498. Published by Allured publisher USA. Available online at http://www.jeoronline.com
  3. Usman, L. A., Ameen, O. M.; Ibiyemi, S. A. and Muhammed , N. O.  (2005), “The Extraction of protein From the Neem Seed (Azadirachta indica)”, African Journal of Biotechnology (AJB), 4(10): 1142 – 1144. Published by Academic Journals Nairobi Kenya.  Available online at http://www.academicjournals.org/AJB
  4. Olawore, N. O., Usman, L. A., Ogunwande, I. A., Adeleke, K. A. (2006), Constituent of Rhizome Essential oils of two types of Cyperus articulatus L.grown in Nigeria. Journal of Essential Oil Research 18: 604 – 606. Published by Allured publisher USA. Available online at http://www.jeor.com
  5. Oluwaniyi, O. O., Ibiyemi, S. A., Usman, L. A. (2007), Effect of Detoxification on the Nutrient Content of Thevetia peruviana seed cake, Research Journal of Applied Sciences, 2(2); 188-199. Puplished by Medwell Jornal Faisalabad Pakistan. Available online at http://www.medwelljournals.com
  6. Usman, L. A. ; Ameen, O. M.; Lawal, A., Awolola, G. V.(2008). “Effect of Alkaline hydrolysis on the Quantity of Extractable protein fractions (Prolamin, Albumin, globulin and Glutelin) in Jatropha curcas seed cake cake”, Journal of Food Technology 6(6): 259 – 262. Published by Medwell Journal Faisalabad Pakistan. Available online at http://www.medwelljournals.com
  7. Uche, B. Eke, Samson, O. Owalude, Usman L. A. (2008). Enrichment of Cassava meal (Gari) with Soyabean Protein Extract. Advances in Natural and Applied. Sciences 2(2): 60-62.Published by Eurasian Network for Scientific Information. Available online at http://www.aensionline.com
  8. James, O. O.; Mesubi, M. A.; Usman, L. A.; Yeye, S. O.; Ogunniran, K. O. Ajanaku, O. O.; Siyanbola T. O. (2009). Physical Characterization of some Honey Samples from North-Central Nigeria. International Journal of Physical Sciences 4(9): 46-470. Available online at http://www.academicjournal.org/ijps
  9. Usman, L. A.; Olawore, N. O.; Oladosu, I.; Hamid, A. A.;
  10. Elaigwu S. E. (2009) Constituent of Leaf Oil of Croton zambesicus Muell Arg. Growing in North- Central Nigeria. Middle -East Journal of Scientific Research 4 (4): 242-244. Published by IDOSI . Available online at http://www.idosi.org
  11. Usman, L. A.; Hamid, A. A.;  George, O.C.; Ameen, O. M.; Muhammad, N.O.; Zubair , M.F. and Lawal, A. (2009).Chemical Composition of Rhizome Essential oil of Curcuma Longa L.Growing in North Central Nigeria. World Journal of Chemistry 4(2): 178-181. Published by IDOSI. Available online at http://www.idosi.org
  12. Usman L. A,; Oluwaniyi, O. O.; Ibiyemi, S. A.; Muhammad, N. Oand Ameen, O.M (2009).The potential of Oleander (Thevetia peruviana) in African agricultural and industrial development: a case study of Nigeria Journal of Applied Biosciences 24: 1477-1487 Published by Elewa Kenya Nairobi. Available online at http://www.biosciences.elewa.org
  13. Elaigwu, S.E. Usman, L. A. Awolola, G.V. Adebayo, G. B. Ajayi, M. R. K. (2009). Adsorption of Pb(II) from Aqueous Solution by Activated Carbon Prepared from Cow Dung. Advances in Natural and Applied Sciences. 3(3): 442 – 446. Published by AENSI, Available online at http://www.aensionline.com
  14. James O. O., Mesubi M. A., Ajanaku, K. O. and Usman L. A. (2010). Processing of Triglycerides to Biofuels: Easily Practicable Small Scale Approach. Energy and Environment 20(8):1325-1341 Published by Multi-science publishing Company, United kingdom. Available online at http://www.multi-science.co.uk
  15. Usman, L. A. Oladosu, I.  A., Olawore, N. O., Fakunle, C. O., Hamid, A. A., Lawal A. (2010)Chemical Composition of Leaf essential oil of Aspilia Africana C.D. Adams Grown in Nigeria.Journal of Medicinal Plants Research 4(4): 346 – 348. Published by Academic Journals, Nairobi, Kenya. Available online at http://www.academicjournal.org/jmpr
  16. Usman, L. A., Zubair, M. F., Adebayo, S. A., Oladosu, I. A., Muhammad, N. O., Akolade J .O (2010). Chemical composition of Leaf and Fruit essential oils of Hoslundia opposita Vahl grown in Nigeria.  American-Eurasian Journal of Agriculture And Environmental Science. 8(1): 40-43 Published by IDOSI Available online at http://www.idosi.org
  17. Hamid, A. A., Aiyelagbe, O. O., Usman, L. A., Ameen, O. M., Lawal A. (2010). Antioxidants: Its medicinal and pharmacological applications. African Journal of Pure and Applied Chemistry. 4(8): 142 – 151. Published by Academic Journals, Nairobi, Kenya. Available at http://www.academicjournal.org/ajpac
  18. James, O. O., Maity, S., Usman, L. A., Ajanaku, K. O. Ajani, O.O., Siyanbola, T.O., Shau, S., Chaubey,  R. (2010). Towards the conversion of carbohydrates biomass feedstock to biofuels via hydroxylmethyl furfural. Energy and Environmental Science, (3) 1833 – 1850. Published by RSC, Available online at http://www.rsc.org
  19. Usman, L. A., Hamid, A. A., Muhammad, N.O., Olawore, N. O., Edewor, T. I., Saliu, B. K (2010).Chemical constituents and Anti-inflammatory Activity of Leaf essential oil of Nigerian grown Chenopodium album. EXCLI Journal, 9: 181-186 Published by Leibniz Research Centre for Working Environment and Human Factors. Germany Available online at http://www.excli.de
  20. Usman, L. A., Hamid, A. A., Olawore, N. O., Fakunle, C. O., Oladosu, I. A., Zubair  M. F. (2010).Chemical composition of Leaf Essential oil of Clausena anisata growning in North-central Nigeria. Journal of Applied Sciences Research 6(6): 891 – 894. Published by INSInet Available online at http://www.insipub.com
  21. Ameen, O. M., Usman, L. A., Oganija, F., Hamid, A. A., Muhammad, N. O., Zubair, M. F., Adebayo, S.A. (2011). Chemical composition of Leaf Essential oil of Annona Senegalenses Pers (Annonaceae) growing in North–Central Nigeria. International. Journal of Biological and Chemical Sciences. 5(1): 375 – 379. Published by International Formulae Group, Cameroon. Available online at http://www.ajol.info
  22. Hamid, A. A., Usman, L. A., Adebayo, S. A., Zubair, M. F., Elaigwu, S. E. (2010). Chemical constituents of leaf essential oil of north central Nigerian grown Vitex agnus-castus L. Advances in Environmental Biology. 4(2):250 – 253. Published by AENSI, Available online at http://www.aensionline.com
  23. Saliu, B. K., Usman, L. A., Muhammad, N. O., Akolade, J. O. (2011).Chemical composition and antibacterial activity (on oral isolates) of leaf essential oil of ocimum gratissimum L. grown in north central Nigeria. International Journal of Current Research. 3(3):22 – 28 Published by International Journal of Current Research. Available online at http://www.ijcrr.com
  24. Hamid, A. A., Aiyelagbe, O. O., Usman, L. A. (2011). Essential oils: Its Medicinal and Pharmacological uses. International Journal of Current Research. 3(2):86 – 98. Published by International Journal of Current Research. Available online at http://www.ijcrr.com
  25. Muhammad, N. O., Bamishaiye, E. L., Bamishaiye, O. M., Usman, L. A., Salawu, M. O., Nafiu, M. O., Oloyede, O. B. (2011). Physicochemical properties and fatty acid composition of Cyperus esculentus (Tiger Nut) tuber oil. Bioresearch Bulletin, 5:51-54. Published by Bioindica Press. Available online at http://www.bioindicapress.com/brb  (b) National
  26. Usman, L. A., Ibiyemi, S. A., Oluwaniyi, O. O., Ameen, O. M (2003); Effect of Acid and Alkaline hydrolysis on the concentration of Albumin and globulin in Thevetia peruviana seed cake protein extract” BIOKEMISTRI, 15 (1): 16-21. Published by Nigerian Society for Experimental Biology. Available online at http://www.bionline.org
  27. Ameen, O. M., Olatunji, G. A., Atata, R. F., Usman, L. A. (2011). Antimicrobial activity, cytotoxic test and phytochemical screening of extracts of the stem of   Fadogia agrestis, NISEB Journal 11(1): 79-84. Published by Nigerian Society for Experimental Biology.  Available at http://www.nisebj.org
  28. Adebayo, S. A. and Usman, L. A. (2009); Levels of ammonia - nitrogen, carbon dioxide, dissolved oxygen and biochemical oxygen demand in Asa river, Ilorin, Nigeria, Science Focus, 14(4): 488 – 495. http://www.sciencefocusngr.org
  29. Edewor, T. I.; Ibikunle, G. J. and Usman L. A. (2009),Phytotoxic and antimicrobial screening of Saponin isolated from ethanolic leaf extract of Xylopia aethipioca, Science Focus, 14(4): 507 – 512.Published by Faculty of pure and applied sciences, LAUTECH, Ogbomoso. http://www.sciencefocusngr.org
  30. Ameen, O. M., Usman, L. A. Oladosu, I. A. Olawore, N. O. Ogunwande, I. A. (2011). Bioactivity of rhizome essential oils from two varieties of Cyperus articulatus (L.) grown in Nigeria, using brine shrimp (Artemia salina) lethality tests. Journal of Medicinal Plants Research. (Letter of Acceptance Dated 20 October, 2010) Available at http://www.academicjournal.org/ajpac
  31. Zubair, M. F., Oladosu, I. A., Olawore, N. O., Usman, L. A., Fakunle, C. O., Ali, M. S, Hamid, A. A. (2011). Bio-active steroid from the root of bark of Psorospermum corymbiferum (HOCHR).Chinese Journal of Natural Medicine (Letter of Acceptance Dated 11 January 2011). Available at www.elsevier.com/locate/cjnm
  32. O. M. Ameen1*, L. A. Usman1, I. A. Oladosu2, N. O. Olawore3 and I. A. Ogunwande(2011)Bioactivity of rhizome essential oils from two varieties of Cyperus articulatus (L.) grown in Nigeria, using brine shrimp (Artemia salina) lethality tests Journal of Medicinal Plants Research Vol. 5(6), pp. 1031-1033 Available online at http://www.academicjournals.org/JMPR
  33. O. M. AMEEN 1*, L. A. USMAN 1, F. S. OGANIJA 1, A. A. HAMID 1,N. O. MUHAMMED 2, M. F. ZUBAIR 1 and S. A. ADEBAYO 1Chemical composition of leaf essential oil of Annona senegalensis Pers.Annonaceae) growing in North Central Nigeria Int. J. Biol. Chem. Sci. 5(1): 375-379 Available online at http://ajol.info/index.php/ijbcs.