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Extraction of Citrus Oil from Peel Slurry of Japanese Citrus Fruits with Supercritical Carbon Dioxide

Keywords: Supercritical carbon dioxide , peel slurry , citus oil compositions , oxygenated compounds , extraction efficiency

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Abstract:

Peel slurry of some Japanese citrus fruits, such as lemon, shikuwasa and daidai, was used as an alternative source of citrus oil and the extraction was conducted by using supercritical carbon dioxide at 333 K and 20 MPa in order to compare the compositions and the extraction efficiency of oils extracted from these slurries. The peel slurry of citrus fruits containing oil, water and solid cellulose materials was used as a feed material of this study. Extraction was carried out at 333 K and 20 MPa while the extraction efficiency over 80% was obtained for lemon and shikuwasa but it was about 60% for daidai peel slurry. The extracted oils were analyzed by GC-FID and GC-MS to compare the compositions of oils among these peel slurries. The compositions of extracted oils differed qualitatively and quantitatively from each other of feed materials in such a way that the monoterpenes (C10H16) content varied 89.23 to 93.20% with the type of peel slurry, while limonene as a major compound. Oxygenated compounds in these oils represented 8.84, 5.5 and 4.49% in lemon, daidai and shikuwasa peel slurry, respectively. The obtained product with the composition was almost the similar with the other citrus oils extracted from fresh fruit peels.

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