1. Department of Applied Chemistry, Adama Science and Technology University, P.O. Box, Adama 1888, Ethiopia
2. Department of Applied Biology, Adama Science and Technology University, P.O. Box, Adama 1888, Ethiopia
3. Department of Chemistry, University of Botswana, Gaborone P/Bag 00704, Botswana
4. Department of Biomaterials, S Aveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai 600 077, India