1. Faculty of Science, Department of Chemistry, University of Maroua, Maroua, Cameroon
2. Department of Chemistry, Higher Teachers’ Training College, University of Maroua, Maroua, Cameroon
3. Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
4. Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere, Cameroon
5. Faculty of Sciences, Department of Animal Biology, University of Douala, Douala, Cameroon
6. Faculty of Sciences, Department of Chemistry, University of Douala, Douala, Cameroon
7. Department of Chemistry, Higher Teachers’ Training College, University of Yaoundé, Yaoundé, Cameroon
8. Department of Leather and Textile Engineering, National Polytechnic Institute, University of Maroua, Cameroon
9. Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Yamagata, Japan