1. Natural Products Chemistry Research Unit, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
2. International Center for Chemical and Biological Sciences, University of Karachi, Karachi, Pakistan
3. Research Unit of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
4. Food Science Program, Department of Chemistry, Carleton University, Ottawa, Canada