The oxygen heterocyclic fraction of cold-pressed lemon essential oils has been studied by normal- phase HPLC. The components of the fraction have been isolated by column chromatography, TLC and semi- preparative HPLC with recycle. The identi®cation of the isolated components has been carried out by 1H-NMR and mass spectrometry. Three coumarins (5-geranyloxy-7-methoxycoumarin, citropten, 5-isopente- nyloxy-7-methoxycoumarin) and ten psoralens (bergamottin, 8-geranyloxypsoralen, oxypeucedanin, byakange- licol, oxypeucedanin hydrate, byakangelicin, imperatorin, phellopterin, isoimperatorin, 5-isopent-20-enyloxy-8- (20,30-epoxyisopentyloxy)-psoralen) have been isolated and identi®ed. The main components were bergamottin (160±291 mg/100 g of oil) and 5-geranyloxy-7-methoxycoumarin (180±250 mg/100 g of oil). Moreover, herniarin, a coumarin characteristic of lime essential oil, has been detected. Herniarin had been reported previously in essential oils obtained from Citrus limon L. var. Eureka.
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