1. Department of Chemistry and Biochemistry, School of Sciences and Aerospace Studies, Moi University, Eldoret, Kenya
2. Africa Center of Excellence II in Phytochemicals, Textile and Renewable Energy (ACE II PTRE), Moi University, Eldoret, Kenya
3. Department of Pure and Applied Chemistry, School of Natural Sciences, Masinde Muliro University of Science and Technology, Kakamega, Kenya
4. Department of Chemistry, Faculty of Science, Egerton University, Njoro, Kenya