1. Department of Applied Chemistry, Adama Science and Technology University, P.O.Box 1888, Adama 1888 Ethiopia
2. Department of Chemistry, Jigjiga University, P.O.Box 1020, Jigjiga 1020, Ethiopia
3. Department of Chemistry, University of Botswana, Notwane Rd, P/bag UB 00704 Gaborone, Botswana
4. Department of Biomaterials, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 602117, India