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Flavonoids in peel and juice of mandarin fruits from Neretva valley

Neretva mandarin is a protected original Croatian product whose name is registered as a protected designation of origin, and the specific position along the Neretva river makes it unique. Mandarin fruits are a good source of phenolic compounds, although the amount varies greatly between varieties. Polymethoxylated flavones (PMF) are effective natural biopreservatives found almost exclusively in the genus Citrus, especially in mandarin peels. In this research, individual phenolic compounds in bark and juice were determined by liquid chromatography (HPLC-DAD) in five cultivars (Zorica, Charara, Kawano Wase, Owari and Saigon) of Neretva mandarins. Hesperidin (67.78-107.81 mg L-1), narirutin (117.12- 278.73 mg L-1) and naringin (4.56-6.53 mg L-1) were present in the juice, and the peel also contained polymethoxy flavonoids ; sinensetin (0.13-0.29 mg g-1), nobiletin (0.10-0.49 mg g-1) and tangeretin (0.06-0.21 mg g-1). Citrus peels had more flavonoids and higher content than pulps and juices.

Neretva mandarin ; peel ; juice ; flavonoids ; polymethoxy flavonoids

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