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Supercritical CO2 extraction of volatile compounds from mandarin peels

During the industrial processing of mandarin, large amounts of waste, including peels, are produced. Since it was shown that the peels contain higher concentration of bioactive compounds compared to pulps and thus have more potential for being used as source of bioactive compounds. Mandarin peels, due to its compounds, have been found to have health- related properties including antioxidant, anticancer and anti-inflammatory. The peels of Citrus reticulata Blanco cultivars of different variety (Zorica rana, Chahara, Okitsu, Kuno) from the Opuzen were extracted by supercritical CO2 (SC-CO2) at extraction temperature of 40°C and at two different pressures 100 and 300 bar. The extracts were analysed in detail by gas chromatography and mass spectrometry (GC/MS). The limonene predominance was found in samples variety Zorica rana, Okitsu and Kuno, followed by eremophylene in variety Zorica rana, Chahara and Okitsu, and γ-terpinene in variety Kuno. The results showed that volatile composition were completely different according to used mandarin variety. Furthermore, SC-CO2 extraction applied to food by-products such as mandarin peel exhibited a strong potential for the industrial development in the production of the extracts rich in bioactive compounds.

mandarin peel ; by-product ; supercritical CO2 extraction ; GC-MS

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