Table 1.

Antibacterial activity of structurally related compounds and parent terpenes against Gram-positive and Gramnegative reference strains.

Compound	Minimum Inhibitory Concentrations MIC (µg/mL)
	Gram-Positive Bacteria			Gram-Negative Bacteria
	Staphylococcus aureus ATCC 43300	Enterococcus faecalis ATCC 51299	Enterococcus faecium ATCC 35667	Escherichia coli ATCC 25922	Klebsiella pneumoniae ATCC 700603	Acinetobacter baumannii ATCC 19606
Geranyl acetone (1)	48	36	28	26	18	18
6	26	18	16	14	14	12
7	26	16	18	16	16	14
8	38	26	28	18	18	22
9	28	18	14	28	18	16
10	46	26	18	32	18	16
11	26	22	18	28	28	14
Nerolidol (2)	48	38	32	46	16	26
12	48	46	42	40	28	26
13	46	42	38	40	20	22
14	48	38	36	38	18	28
15	46	48	38	28	16	16
16	48	38	36	32	24	22
17	48	38	38	46	18	16
Farnesal (3)	24	22	36	46	44	36
18	18	22	28	52	46	46
19	28	34	38	44	36	42
20	22	20	32	48	38	38
21	32	38	42	54	48	52
22	26	24	46	44	36	36
23	28	26	36	46	34	36
Farnesol (4)	26	18	16	28	16	18
24	22	18	32	52	44	40
25	28	32	34	50	48	44
26	32	30	36	48	42	38
27	28	26	18	36	18	34
28	26	18	16	28	16	18
29	28	22	18	38	36	32
Farnesyl acetate (5)	28	20	20	28	22	22
30	30	24	18	30	24	24
31	24	20	20	26	22	18
32	28	22	20	28	18	22
33	26	18	16	26	18	22
34	32	20	18	18	20	18
35	34	16	14	16	18	12
Ciprofloxacin	8	2	8	4	2	4
Gentamicin	16	>64 *	32	4	32	32

* The maximum examined concentration was 64 µg/mL.