1. Department of Chemistry, Lagos State University, P.M.B 1087 Apapa, Lagos, Nigeria
2. Chemistry Department, University of Limpopo, Medunsa campus, South Africa
3. National Horticultural Research Institute, Idi Ishin, Jericho Reservation Area, Ibadan Oyo State Nigeria
4. Department of Biochemistry & Microbiology, University of Zululand, KwaDlangezwa, South Africa
5. Department of Chemistry, University of Alabama in Huntsville, Huntsville, AL 35899, USA