Mohagir A. M.

Faculty of Pure and Applied Science, University of N’djamena, Chad

Bup N. D

Higher Institute of the Sahel, University of Maroua, Cameroon

Abi C. F.

Department of Chemistry, Higher Teachers’ Training College, University of Yaounde1, Cameroon

Kamga R.

National School of Agro-Industrial Science, University of Ngaoundere, Cameroon

Kapseu C.

National School of Agro-Industrial Science, University of Ngaoundere, Cameroon