1. Catalysis and Peptide Research Unit, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
2. Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, Enugu State, Nigeria
3. Physical Chemistry Research Laboratory, Department of Chemistry, University of Free State, Bloemfontein, South Africa
4. School of Chemistry and Physics, University of KwaZulu-Natal, Durban, South Africa
5. Department of Chemical Sciences, Olabisi Onabanjo University, Ago-Iwoye, Nigeria
6. Chemistry Department, Michael Okpara University of Agriculture, Umudike, Nigeria