1. Research and Technology Institute (CENAREST/IRT), Gros Bouquet, Libreville, Gabon
2. Biochemistry, Institute of Pharmacopoeia and Traditional Medicine (CENAREST/IPHAMETRA), Sibang, Libreville, Gabon
3. Laboratory of Biochemistry Department, Faculty of Medicine, University of Health Sciences, Owendo, Libreville, Gabon
4. Chemistry and Wood Sciences, National School of Water and Forests of Gabon, Libreville, Gabon
5. LAPLUS, Pluridisciplinary Science Laboratory, ENS, Libreville, Gabon