1. Department of Applied Chemistry, Adama Science and Technology University, P.O. Box 1888, Adama, Ethiopia
2. Traditional and Modern Medicine Research and Development Directorate, Armauer Hansen Research Institute, P.O. Box 1242, Addis Ababa 1165, Ethiopia
3. Department of Applied Biology, Adama Science and Technology University, P.O. Box 1888, Adama 311-2118 Ethiopia
4. Department of Chemistry, University of Botswana, Gaborone P/Bag 00704, Botswana
5. Department of Biomaterials, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai 600 077, India