Antibacterial and antibiofilm activity of acetone leaf extracts of nine under-investigated south African Eugenia and Syzygium (Myrtaceae) species and their selectivity indices

Table 5 Effect of acetone crude leaf extracts of nine plants against Gram-negative and Gram-positive bacteria after 24 and 48 h pre-formed biofilm expressed as percentage (%) biofilm inhibition. The numbers > 0% ≤ 50% indicates low activity, > 50% (in bold) indicates high activity against the bacteria. Negative values denote enhancement of biofilm [44]

	E. coli		P. aeruginosa		S. Typhimurium		E. faecalis		B. cereus		S. aureus
	24 h	48 h	24 h	48 h	24 h	48 h	24 h	48 h	24 h	48 h	24 h	48 h
E. erythrophylla	− 150	−26	− 261	− 364	− 275	30	−21	−67	−254	− 194	5	− 115
E. natalitia	82	− 142	− 362	− 178	73	21	−211	− 7	− 35	− 44	− 248	43
E. woodii	ND	ND	− 218	− 16	29	− 175	ND	ND	−179	− 171	− 147	− 488
E. umtamvunensis	43	28	− 126	−140	33	94	86	−155	−12	−7	75	38
E. zeyheri	237	−4	− 263	− 65	341	66	ND	ND	− 260	−47	− 299	− 326
S. legatii	−115	− 146	− 85	− 82	−143	− 273	39	4	−275	− 216	56	− 41
S. masukuense	218	95	ND	ND	154	162	138	− 426	9	257	ND	ND
S. species A	38	142	ND	ND	43	151	ND	ND	− 192	48	ND	ND
S. gerrardii	ND	ND	ND	ND	59	−142	71	69	96	−103	142	133
Gentamicin	90	64	78	85	18	103	81	72	27	12	75	53

ISSN: 2662-7671