**Author details**

John Okapes Joseph1 , Isaac W. Mwangi1\*, Sauda Swaleh1 , Ruth N. Wanjau1 , Manohar Ram1 and Jane Catherine Ngila2

\*Address all correspondence to: isaacwaweru2000@yahoo.co.uk

1 Department of Chemistry, Kenyatta University, Nairobi, Kenya

2 Department of Chemical Technology, University of Johannesburg, South Africa
