Table 4.

Furocoumarins and methoxycoumarins (as mg/kg) in the essential oil from the fruit peels of Citrus limon (L.) Osbeck based on the analysis of 10 batches of different origins

Congener	Average (mg/kg)	Range (mg/kg)
		Outside EUa	Mediterranean
Furocoumarins
Psoralen	45.3	85–92	4.4–18.5
5‐Methoxypsoralen (bergapten)	23.6	3.9–5.8	7.5–75.4
5‐Geranoxypsoralen (bergamottin)	497.3	1.0–1.4	250–1,272
Oxypeucedanin	214.7	0.2–0.4	249–456
8‐Methoxypsoralen (xanthotoxin)	187.3	0.2–0.5	152–430
8‐Geranoxypsoralen	100.6	< 250	0.2–0.5
Imperatorin	31.5	0.7–11.4	27.1–63.9
5,8‐Dimethoxypsoralen (isopimpinellin)	6.04	0.1–0.3	7.4–13.9
Phellopterin	0.37	< 0.4	0.1–1.0
Oxypeucedanin hydrate	20.2	< 0.1	7.8–53.4
Byakangelicol	178.7	n.d.c	93.9–273
Byakangelicin	< 0.1	< 0.1	< 0.1
Methoxycoumarins
Citroptenb	163.0	0.1–1.0	70–570
5‐Geranyloxy‐7‐methoxycoumarin	< 0.1	< 0.1	< 0.1

^aArgentina, Brazil and South Africa.

^bDetermined in the volatile fraction by GC‐MS.

^cLOD not given.