Table I. Composition of grapefruit peel essential oil obtained directly from secretory cavities using microcapillaries.

Constituents	Concentration
	ED 70 mm	SD	ED 80 mm	SD	ED 100 mm	SD
	µg µL−1 oil
Monoterpenes
Limonene	645.1	81.0	670.3	62.4	820.8	57.0
Myrcene	23.2	3.1	23.7	2.2	29.3	2.4
Sabinene	16.6	5.2	8.4	1.4	6.9	2.5
γ-Terpinene	2.7	0.7	2.0	0.6	7.1	1.8
α-Terpinene	1.6	0.4	1.2	0.5	5.9	2.0
α-Pinene	3.9	1.0	3.7	0.3	4.6	0.4
β-Pinene	1.3	0.4	0.6	0.2	0.6	0.1
Terpinolene	0.8	0.8	1.7	0.5	3.1	0.9
Sum	695.3	85.1	711.5	65.7	878.2	60.6
Percentage (total)	94.8	11.6	94.1	8.7	95.6	6.6
Sesquiterpenes
β-Caryophyllene	0.23	0.05	0.21	0.04	0.21	0.03
β-Farnesene	0.17	0.06	0.09	0.03	0.09	0.04
Sum	0.4	0.11	0.3	0.07	0.3	0.07
Percentage (total)	0.05	0.01	0.04	0.01	0.03	0.01
Coumarins and furanocoumarins
Aurapten	9.0	1.1	16.0	2.6	14.0	6.5
Epoxyaurapten	4.9	0.8	4.6	1.0	3.9	1.7
Meranzin	8.4	2.1	9.0	3.4	9.4	2.1
Isomeranzin	1.0	0.3	1.1	0.2	1.2	0.0
Bergamottin	0.6	0.2	1.3	0.1	1.3	0.8
Epoxybergamottin	9.9	3.2	8.5	0.2	7.0	2.9
Osthol	0.2	0.1	0.2	0.0	0.2	0.0
Sum	34.1	7.7	40.6	7.6	37.0	14.0
Percentage (total)	4.6	1.0	5.4	1.0	4.0	1.5
Polymethoxylated flavones
Nobiletin	1.1	0.3	0.6	0.1	0.5	0.2
Tangeritin	0.6	0.1	0.3	0.0	0.3	0.1
Heptamethoxyflavone	0.5	0.1	0.4	0.1	0.3	0.0
Sum	2.2	0.5	1.3	0.1	1.0	0.3
Percentage (total)	0.3	0.07	0.2	0.02	0.1	0.03
Sterols
β-Sitosterol	1.15	0.09	1.53	0.60	1.59	0.68
Cycloartenol	0.88	0.40	1.18	0.41	0.80	0.21
Campesterol	0.03	0.01	0.04	0.01	0.04	0.01
Stigmasterol	0.02	0.01	0.03	0.01	0.03	0.01
Sum	2.08	0.47	2.78	1.02	2.47	0.55
Percentage (total)	0.3	0.06	0.4	0.13	0.3	0.06
Fatty acids
Palmitic acid (C16:0)	0.003	0.001	0.005	0.000	0.006	0.001
Stearic acid (C18:0)	0.001	0.001	0.002	0.000	0.002	0.001
Linoleic acid (C18:2)	0.007	0.003	0.011	0.003	0.013	0.003
α-Linolenic acid (C18:3)	0.005	0.002	0.007	0.003	0.007	0.002
Sum	0.016	0.007	0.024	0.006	0.028	0.004
Percentage (total)	0.002	0.0009	0.003	0.0008	0.003	0.0004