In Vitro Antibacterial and Antibiofilm Activity of Lippia alba Essential Oil, Citral, and Carvone against Staphylococcus aureus

Table 1

Chemical composition, calculated retention index (RI_C), percentages of identified components (%), and similarity index (SI) in comparison with MS library, of essential oils from Lippia alba chemotypes: LA1, LA2, and LA3.

Component		LA1	SI	LA2	SI	LA3	SI
Sabinene	975	0.54	93	—	—	—	—
6-Methyl-5-hepten-2-one	985	3.89	96	2.34	94	—	—
Myrcene	990	4.08	96	—	—	—	—
p-Cymene	1024	9.84	95	4.12	96	0.96	91
Limonene	1029	—	—	1.64	95	5.25	94
γ-Terpinene	1059	0.41	95	—	—	1.70	93
E-4-Thujanol	1070	0.58	94	1.23	90	—	—
Z-Linalool oxide	1072	—	—	0.13	91	—	—
E-Linalool oxide	1086	—	—	0.27	92	—	—
Linalool	1096	1.16	96	1.02	94	1.38	91
Z-Limonene oxide	1136	—	—	0.75	88	—	—
E-Limonene oxide	1142	—	—	1.12	89	—	—
E-Isocitral	1180	0.39	96	—	—	—	—
Citronellol	1225	—	—	2.30	85	—	—
Nerol	1229	1.64	95	—	—	—	—
Neral	1238	26.44	97	18.42	96	2.88	95
Carvone	1243	—	—	4.25	94	71.54	97
Piperitone	1252	—	—	—	—	0.73	90
Geraniol	1252	1.86	96	—	—	—	—
Geranial	1267	35.82	97	24.87	97	4.66	95
Hydroxycitronellal	1288	—	—	2.73	76	—	—
Neric acid	1340	0.42	92	5.19	84	—	—
Geranic acid	1359	0.36	96	17.24	95	—	—
Germacrene D	1485	—	—	—	—	2.51	92
Cubebol	1515	—	—	—	—	0.92	73
Elemol	1549	5.41	95	5.04	94	3.90	93
Germacrene D-4-ol	1575	—	—	—	—	0.88	72
Caryophyllene oxide	1583	0.95	92	—	—	—	—
Guaiol	1600	1.49	91	—	—	0.92	87
(Citral = neral + geranial)		(62.26)	—	(43.29)	—	(7.54)	—
Total		95.28	—	92.64	—	98.23	—

Not detected.