Antioxidative Components of Various Citrus Essential Oils Recovered from the Waste of the In-Line Juice Extractor

Studies on Improvement of Satsuma mandarin Juice Quality and Utilization of Peels. Part VII

Abstract

The physical and chemical properties, evaporated residue, carotenoid content and total tocopherol of essential oils of Satsuma mandarin (Citrus unshiu Marc.), Natsudaidai (C. natsudaidai Hayata), Kabosu (C. sphaerocarpa Hort.), Valencia orange (C. sinensis Osbeck), Marsh grapefruit (C. paradisi Macfad), Ruby Red grapefruit (C. paradisi Macfad) and Temple orange (C. temple Hort.) were examined. No remarkable differences in specific gravity and refractive index were found among the citrus oils. Satsuma mandarin oil showed the highest value in the amount of the evaporated residue, carotenoid and tocopherol among the examined samples. Citrus oils showed strong antioxidative activity due to the presence of carotenoid and tocopherol determined by TLC as total tocopherol.