1. Onyema, C.T., U.E. Ekpunobi and E.O. Ndigbo, 2015. Evaluation of the heavy metal level in selected Industrially packaged food spices. AASCIT Commun., 2: 32-40.
2. Okerulu, I.O., C.T. Onyema and F.C. Agunabu, 2015. Assessment of the phytochemicals, proximate and elemental composition of the fruits of dialium guineese (Icheku). Aascit J. Chem., 2: 93-96.
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3. Okerulu, I.O. and C.T. Onyema, 2015. Comparative assessment of phytochemicals, proximate and elemental composition of gnetum africanum (okazi) leaves. Am. J. Anal. Chem., 6: 604-609.
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4. Ogbuagu, A.S., A.O. Onyema, U.E. Ekpunobi and C.T. Onyema, 2015. Nutritional and heavy metal analysis on four local fruits in awka south eastern Nigeria. Int. J. Chem. Biomed. Sci., 1: 83-88.
5. Onyema, C.T., V.I. Ajiwe and O.O. Nwankwo, 2014. Phytochemical and anti-microbial analysis of the roots of Ficus Exasparata (anwirinwa). Sci. J. Chem., 2: 11-15.
6. Onyema, C.T., U.E. Ekpunobi, A.A. Edowube, S. Odinma and C.E. Sokwaibe, 2014. Quality assessment of common instant noodles sold in Nigeria markets. Am. J. Anal. Chem., 5: 1174-1177.
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7. Onyema, C.T., T.A. Ezekwere, P.U. Ofora, C.B.Sokwaibe, S.C. Odimma and E.C. Ohaekenyem, 2014. Comparative study of the heavy metal concentration of the various parts of Phractocephalus hemioliopterus (catfish) and Trachurus teachurus (horsefish). Am. J. Sci. Nutr., 1: 72-75.
8. Onyema, C.T., H.C. Eneh, P.U. Ofora, I.J. Ekwueme and C.B. Sokwaibe, 2014. Assessment of ground water quality of Nnamdi Azikwe university, Awka, Anambra state, Nigeria. Aust. J. Ind. Res., 2014: 1-5.
9. Onyema, C.T., F.O. Okerenwogba, I.M. Iloameke, I.J. Ekwueme, M.C. Ejiagha and E.C. Ohaekenyema, 2014. Extraction and characterisation of biodiesel from cashew nuts and shells oil (Anarcadium occidentale). Am. J. Sci. Technol., 1: 344-347.
10. Onyema, C.T. and V.I.E. Ajiwe, 2014. Phytochemical and antimicrobial analysis of the stems of cola gigantea (sterculiacea). Int. J. Eng. Sci., 3: 1-11.
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11. Onyema, C.T. and V.I.E. Ajiwe, 2014. Phytochemical and anti-microbial analysis of the leaves of cola gigantea (sterculiaceae). Int. J. Appl. Sci. Technol., 4: 119-126.
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12. Okonisa, O.I., I.C. Egwuatu, A.S. Ogbuagu, E.C. Ohaekenyem, I.J. Ekwueme and C.E. Sokwaibe, 2014. Phytocoil production from the leaves of Azadirachta indica (neem) and Hyptis suaveolens (bush mint). AASCIT J. Chem., 1: 1-4.
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13. Ofora, P.U., R.U. Arinze, J.N. Nwokoye, C.T. Onyema, I.J. Ekwueme and C. Okpalaunegbu, 2014. Modification of cassava residue into carboxymethylcellulose. World Eng. Appl. Sci. J., 5: 36-39.
14. Madubuike, P.C., C.T. Onyema, S.C. Odimma and C.E. Sokwaibe, 2014. Evaluation of mineral elements, cyanide and proximate composition of cassave (mannihot esculenta crantz) from Ebonyi state, Nigeria. J. Environ. Sci. Toxicol. Food Technol., 8: 41-43.
15. Ekpunobi, U.E., S.C. Ukatu, B.O. Ngene, C.T. Onyema and P.U. Ofora, 2014. Investigation of the thermal properties of selected fruits and vegetables. Am. J. Sci. Technol., 1: 293-297.
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16. Okoro, V.E, S.C. Odimma, C.T. Onyema and O.V. Eneze, 2013. The study of the effect of polyethylene and poly vinyl chloride on the physico-chemical properties of portland cement. Int. J. Eng. Sci. Invention, 2: 23-27.
17. Iloamaeke, I.M., T.U. Onuegbu, U.C. Umeobika and C.T. Onyema, 2013. A comparative study of Vitex doniana and Pterocarpus soyauxi as corrosion inhibitors of Mild steel in HCl medium. J. Atoms Mol., 3: 509-519.
18. Ezigbo, V.O., S.C. Odimma, I.J. Duruaku and C.T. Onyema, 2013. Preliminary phytochemical screening and anti-bacterial activity on stem bark extracts of ceiba peritandra. IOSR J. Appl. Chem., 6: 42-44.
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19. Onwukeme, V.I., P.M. Nweke and C.T. Onyema, 2011. Characterisation of Canarium Schweinfurthii biodiesel produced through Sodium hydroxide catalyzed trans-esterification process. J. Sci. Eng. Technol., 14: 10128-10133.
20. Ogbu, I.M., T.U. Onuegbu, V.I.E. Ajiwe and C.T. Onyema, 2011. The current status, prospect and challenges of biofuel: A review. Anachem J., 5: 989-997.