Table 1.

Normalised relative abundance (minimum, maximum and average normalised % area) of the marker compounds in bergamot, lavender and tea tree essential oils (number of samples: 20).

	Citrus limon (L.) Osbeck
	Compounds	Itsexp	Itslit	Min	Max	Average	σ	Ital. Ph.
2	sabinene	976	976	0.8	1.0	0.9	0.1	0.5–2.0
3	β-pinene	978	980	5.6	6.9	6.5	0.4	5.0–10.0
5	β-myrcene	992	991	0.7	1.5	1.0	0.2
7	α-terpinene	1018	1018	0.1	0.2	0.1	0.1
8	p-cymene	1028	1026	0.2	0.7	0.4	0.2
9	limonene	1031	1031	34.3	40.9	37.8	2.3	30.0–50.0
12	trans-β-ocimene	1051	1050	0.1	0.2	0.1	0.1
13	γ-terpinene	1061	1062	5.3	8.0	6.7	0.9	6.0–18.5
14	α-terpinolene	1089	1088	0.3	0.6	0.3	0.1
15	linalool	1100	1098	9.6	12.3	10.7	0.8	6.0–15.0
21	neral	1243	1240	0.1	0.3	0.2	0.1
22	linalyl acetate	1264	1257	30.0	35.8	31.5	1.6	23.0–35.0
23	geranial	1273	1270	0.1	0.5	0.3	0.1	max 0.5
25	neryl acetate	1369	1365	0.3	0.8	0.5	0.1
26	geranyl acetate	1386	1383	0.3	0.7	0.4	0.1	0.1–0.7
27	trans-β-caryophyllene	1419	1418	0.1	0.6	0.3	0.1	0.2–0.5
30	β-bisabolene	1510	1509	0.1	0.4	0.2	0.1
	Lavandula angustifolia Mill.
	Compounds	Itsexp	Itslit	Min	Max	Average	σ	Eur. Ph.
4	3-octanone	989	986	0.4	1.3	0.9	0.3	0.1–5.0
9	limonene	1031	1031	0.4	1.1	0.7	0.2	max 1.0
10	1,8-cineole	1033	1033	1.3	2.6	2.4	1.2	max 2.5
11	cis-β-ocimene	1041	1040	0.7	3.2	2.4	0.6
12	trans-β-ocimene	1051	1050	0.2	2.2	1.8	0.5
15	linalool	1100	1098	23.8	33.0	29.5	2.5	20.0–45.0
16	1-octen-3-yl acetate	1116	1110	0.4	1.1	0.7	0.2
17	camphor	1147	1143	0.6	1.2	1.0	0.2	max 1.2
18	lavandulol	1171	1166	0.6	1.7	0.9	0.4	min 0.1
19	4-terpineol	1178	1177	2.6	6.0	3.6	1.0	0.1–8.0
20	α-terpineol	1191	1189	0.1	2.0	1.0	0.6	max 2.0
22	linalyl acetate	1264	1257	25.1	40.7	35.4	4.0	25.0–47.0
24	lavandulyl acetate	1293	1289	2.7	5.3	3.5	0.7	min 0.2
27	trans-β-caryophyllene	1419	1418	1.8	5.1	3.5	1.0
29	trans-β-farnesene	1460	1458	1.2	5.2	2.5	1.0
	Melaleuca alternifolia (Maiden & Betche) Cheel
	Compounds	Itsexp	Itslit	Min	Max	Average	σ	Eur. Ph.
1	α-pinene	936	939	1.8	6.0	3.8	1.8	1.0–6.0
3	β-pinene	978	980	0.1	1.1	0.6	0.3
5	β-myrcene	992	991	0.1	1.1	0.5	0.4
6	α-phellandrene	1004	1005	0.0	0.6	0.3	0.2
7	α-terpinene	1018	1018	7.7	10.5	9.2	0.7	5.0–13.0
8	p-cymene	1028	1026	0.7	3.6	2.1	0.8	0.5–12.0
9	limonene	1031	1031	0.8	3.7	2.5	1.0	0.5–4.0
10	1,8-cineole	1033	1033	1.9	7.1	3.9	1.5	max 15.0
13	γ-terpinene	1061	1062	14.3	22.4	19.2	2.4	10.0–28.0
14	α-terpinolene	1089	1088	2.0	4.7	3.1	0.8	1.5–5.0
19	4-terpineol	1178	1177	32.4	47.1	40.5	3.4	min 30.0
20	α-terpineol	1191	1189	2.6	7.1	5.0	1.4	1.5–8.0
28	aromadendrene	1439	1439	0.1	5.8	1.3	1.4	max 7.0

I^t_sexp: experimental programmed temperature retention index; I^t_slit: tabulated programmed temperature retention index.