Effects of Ultrasound Technique on the Composition of Different Essential Oils

Table 7

Changes in the chemical composition in solutions of lemon balm oil.

Compound	IR	Chemical composition of essential oil (mg/ml)
		Alcohol solutions					Hexane solutions
		A	B	C	D	K	A	B	C	D	K
Pinene <alpha->	939	0.82	0.73	0.79	0.72	0.90	1.01	1.02	1.03	1.00	1.03
Pinene <beta->	982	2.87	2.86	2.85	2.78	3.11	3.22	3.23	3.23	3.18	3.30
Limonene	1030	7.17^a	7.60^a	7.55^a	6.75^a	7.24^a	7.33^a	7.43^a	7.45^a	7.51^a	7.36^a
Ocimene <(Z)-beta->	1037	0.64	0.56	0.58	0.59	0.28	0.32	0.32	0.33	0.32	0.33
Linalool	1099	0.67	0.58	0.55	0.67	0.61	0.63	0.64	0.66	0.64	0.65
Citronellal	1152	16.60^a	16.74^a	16.87^a	16.77^a	16.38^a	16.74^a	16.92^a	17.44^a	16.88^a	16.92^a
Terpinen-4-ol	1178	0.33	0.29	0.14	0.32	0.33	0.28	0.29	0.29	0.28	0.30
Terpineol <alpha->	1190	0.40	0.36	0.32	0.40	0.36	0.33	0.34	0.35	0.34	0.32
Citronellol	1227	1.17	1.17±	1.16	1.31	1.21	1.28	1.03	1.33	1.29	1.33
Nerol	1232	11.92^a	11.14^a	11.65^a	11.7^a	10.90^a	11.24^a	11.34^a	11.61^a	11.61^a	11.57^a
Neral	1239	7.39^a	7.53^a	7.83^a	7.96^a	7.42^a	7.85^a	7.84^a	7.27^a	7.51^a	8.16^a
Geraniol	1254	5.03^a	4.47^a	4.29^a	4.50^a	4.88^a	4.85^a	5.03^a	4.75^a	4.96^a	4.88^a
Geranial	1269	7.08^a	6.78^a	6.64^a	7.13^a	7.12^a	6.44^a	6.82^a	7.02^a	6.59^a	6.83^a
Neryl acetate	1363	0.54	0.58	0.61	0.55	0.52	0.51	0.51	0.54	0.53	0.53
Copaene <alpha->	1377	2.26	2.82	2.57	2.80	2.65	2.22	2.27	2.33	2.33	2.28
Caryophyllene <E->	1420	8.40^a	8.54^a	8.09^a	8.10^a	8.47^a	8.65^a	8.77^a	9.07^a	8.99^a	8.48^a
Bergamotene <alpha-trans>	1436	1.71	1.8	1.46	2.01	1.48	1.25	1.28	1.33	1.31	1.29
Humulene <alpha->	1455	2.08	2.04	1.82	1.93	1.85	1.51	1.54	1.60	1.58	1.54
Germacrene D	1487	1.14	1.18	1.18	1.19	1.18	0.91	0.91	0.93	0.95	0.90
Cadinene <gamma->	1515	0.56	0.58	0.46	0.60	0.45	0.34	0.35	0.37	0.38	0.35
Cadinene <delta->	1525	1.17	1.11	0.97	1.18	1.04	0.85	0.86	0.90	0.89	0.86
Caryophyllene oxide	1585	0.92	0.99	0.77	1.15	0.78	0.58	0.60	0.59	0.59	0.56

Designation according to Table 1. IR: retention indices (from temperature programming, using the definition of Van den Dool and Kratz [17]). Values designated with the same superscript letters for the dominant compound do not significantly differ at 5% error (Duncan’s test).