1. Research Unit of Biochemistry of Medicinal plants, Food Sciences and Nutrition, Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
2. Department of Biotechnology and Food Technology, Faculty of Science, University of Johannesburg, Gauteng, South Africa
3. Centre for Natural Products Research, Department of Chemical Sciences, University of Johannesburg, Gauteng, South Africa