1. Department of Chemistry; Kenyatta University; P.O Box 43844 - 00100 Nairobi - Kenya
2. Department of Chemical Science and Technology; Technical University of Kenya; P.O Box 52428 - 00200 Nairobi - Kenya
3. School of Pharmacy and Health Sciences; United States International University - Africa; P.O Box 14634 - 00800 Nairobi - Kenya