Jenipher A. Odak
Maseno University, Department of Chemistry, P.O. Box 333, 40105 Maseno, Kenya. odakjenipher@yahoo.com

P. Okinda Owuor
Maseno University, Department of Chemistry, P.O. Box 333, 40105 Maseno, Kenya.

Lawrence O.A. Mang’uro
Maseno University, Department of Chemistry, P.O. Box 333, 40105 Maseno, Kenya.

Evelyn Cheramgoi
Tea Research Institute, Kenya Agricultural and Livestock Research Organization, P.O. Box 820, 20200 Kericho, Kenya

Francis N. Wachira
Association for Strengthening Agricultural Research in Eastern and Central Africa, Plot 5 Mpigi Road P.O. Box 765, Entebbe, Uganda