[1] Univ Buea, Biotechnol Unit, Dept Biochem & Mol Biol, Buea, Cameroon
[2] Univ Buea, Dept Chem, Chem & Bioact Informat Ctr, Buea, Cameroon
[3] Univ Douala, Fac Sci, CEPAMOQ, Douala, Cameroon
[4] Univ Halle Wittenberg, Dept Pharmaceut Sci, D-06120 Halle, Saale, Germany