samples were less active, their inhibitory potencies being observed on 75% of tested bacteria (21/28) for I. cylindricum and C. zeylanicum, 67.9 % (19/28) for A. melegueta, D. psilurus, F. leprieuri and T. tetraptera; 64.3% (18/28) for M. myristica and S. zenkeri; 50 % (14/28) for P. guineense and 42.9 % (12/28) for P. brazzeana.