the seeds of Fagara leprieurii, Monodora myristica and
Piper guineense, the roots of Dorstenia psilurus, Imperata
cylindricum and Pentadiplandra brazzeana and the leaves
of Cinnamomum zeylanicum. The plants were identified
by Mr. Victor Nana of the National herbarium (Yaoundé,
Cameroon) where voucher specimens were deposited
under a reference number (Table 1). The extracts were
obtained by methanol (MeOH) maceration as previously
described [5].