Dr. Ekarika Clement Johnson
My Social Links

Dr. Ekarika Clement Johnson

Senior Lecturer
Department of Pharmaceutical and Medicinal Chemistry, University of Uyo, Uyo, Akwa Ibom, Nigeria

Highest Degree
Ph.D. in Pharmaceutical Chemistry from Ahmadu Bello University, Nigeria

Share this Profile


Ekarika Johnson, (Ph.D.) is a Senior Lecturer at Department of Pharmaceutical and Medicinal Chemistry, Faculty of Pharmacy, University of Uyo, Nigeria and an affiliate of Nigerian Journal of Pharmaceutical and Applied Science Research, and Natural Product Research as Editor and Reviewer since 2011 and 2015 respectively. Dr. Ekarika Johnson has over 20 scientific papers and projects either presented or published. He has interest in tropical medicinal plants from which he has isolated some useful compounds some of which have been published in international Journals. He is a member of professional and research groups like Chemical Society of Nigeria and Science Teachers Association of Nigeria as well as Drug Discovery and Research Group. His recent publications include papers on isolation of triterpenods (Oleanolic, Ursolic and corosolic acids from Aspilia africana). Dr. Ekarika Johnson holds B.Sc. degree in Chemistry from University of Calabar where he obtained the Prize for the best graduating student, M.Sc. and Ph.D. from Ahmadu Bello University, Zaria, Nigeria.

Area of Interest:

Pharmacology and Toxicology
Proximate Analysis

Research Publications in Numbers


Selected Publications

  1. Eseyin, O.A., A. Daniel, T.S. Paul, E. Attih and E. Emmanuel et al., 2018. Phytochemical analysis and antioxidant activity of the seed of Telfairia occidentalis Hook (Cucurbitaceae). Nat. Prod. Res., 32: 444-447.
    CrossRef  |  PubMed  |  Direct Link  |  
  2. Johnson, E.C., E.I. Etim and E.O. Archibong, 2017. Isolation and anti-oxidant potentials of parahydroxybenzaldehyde from the methanol Leaf extract of Aspilia africana (Pers.) C.D. adams (Asteraceae). Nige. J. Phar. Appl. Sci. Res., 6: 26-32.
    Direct Link  |  
  3. Udobre, A.S., E.I. Etim, A.E. Udoh, U.F. Umoh and E.C. Johnson, 2016. Elevation of chloroquine potency by administering it along with dapsone in mice infected with plasmodium berghei. J. Pharm. Biol. Sci., 4: 121-125.
    Direct Link  |  
  4. Udobre, A.S., A.E. Udoh, E.I. Etim, U.F. Umoh and E.C. Johnson, 2016. Gc-ms analysis of six bioactive compounds isolated from the ethanol leaf extract of Andrographis paniculata( Acanthaceae). Chem. Res. J., 1: 6-10.
  5. Johnson, E.C., M. Ilyas, O.A. Eseyin, E.I. Etim, A.S. Udobre, A.E. Udoh and E.O. Edem, 2016. Isolation, characterization and anti-diabetic potentials of oleanolic acid from the leaves of aspilia africana (Pers) c.d adams (Asteraceae). J. Phar.Medi Res., 2: 62-65.
    Direct Link  |  
  6. Johnson, E.C., M. Ilyas, M.I. Sule, O.A. Eseyin and H.O. Oladimeji, 2016. Antimicrobial activity of compounds isolated from the leaves of Aspilia africana (Pers.) C. D. Adams (Asteraceae). Afr. J. Pharmacol. Ther., 5: 149-154.
    Direct Link  |  
  7. Etim, E., A. Udobre, E. Johnson, A. Udoh and E. Essien, 2016. Development and validation of UV spectrophotometric method for the determination of artesunate and dihydroartemisinin by coupling. Pharm. Innovation J., 5: 4-7.
    Direct Link  |  
  8. Olawale, H.O. and E.C. Johnson, 2015. Glucolipid from the ethyl acetate fraction of Acalypha wilkesiana var. Lace-acalypha (Muell & Arg). J. Pharm. Bioresour., 12: 48-53 .
    CrossRef  |  Direct Link  |  
  9. Eseyin, O.A., G.C. Etiemmana, M. Enobong, A. Ebong and E. Iweh et al., 2015. Evaluation of the antioxidant properties of some commonly eaten vegetables in Akwa Ibom State of Nigeria. Annu. Res. Rev. Biol., 5: 165-173.
    CrossRef  |  Direct Link  |  
  10. Etim, E. I., E.C. Johnson, A.E. Akwaowo and C. Dent, 2014. Artemisinin combination therapy on some liver biochemicals in nigerian male subjects. World J. Appl. Sc. Tech., 5: 41-48.
  11. Johnson, E., M. Chuodhury, E.O. Abraham and U.A. Sunday, 2012. Pharmacological studies of the bark of Commiphora africana (Burseraceae). J. Pharmacol. Toxicol., 7: 52-57.
    CrossRef  |  Direct Link  |  
  12. Eseyin, O.A., A. Ebong, A. Udobre, J. Ekarika and I. Udoh, 2012. Changes in some pharmacokinetics parameters of Chloroquine by Gnetum Africana. Macedonian J. Med. Sci., 5: 275-279.
  13. Johnson, E.C., O.A. Eseyin, A.S. Udobre and P. Ike, 2011. Antibacterial effect of methanolic extract of the root of Aspilia africana. Niger. J. Pharm. Appl. Sci. Res., 1: 44-50.
    Direct Link  |  
  14. Choudhury, M.K., E.C. Johnson and A.S. Agbaji, 2000. Chemical investigation of the bark of Commiphora africana burseraceae. Indian J. Pharm. Sci., 62: 311-312.
    Direct Link  |  
  15. Choudhury, M.K., A.K. Haruna, E.C. Johnson and P.J. Houghton, 1997. Structural elucidation of Columbin, a diterpene isolated from the rhizomes of Aristolochia albida. Indian J. Pharm. Sci., 57: 34-37.
  16. Dosunmu, M. I. And E.C. Johnson, 1995. Chemical evaluation of the nutritive value and changes in ascorbic acid content during storage of the fruit of bitter kola (Garcinia kola). Food Chem., 54: 67 -71.
    CrossRef  |  Direct Link  |