The flavonoid composition of flavedo and juice from the pummelo cultivar (Citrus grandis (L.) Osbeck) and the grapefruit cultivar (Citrus paradisi) from China

The flavonoid composition of flavedos and juices from four Chinese pummelo cultivars (Citrus grandis 'Shatianyu', C grandis 'Guanximiyu'. C. grandis 'Yuhuanyu', and C. grandis 'Cuixiangtianyu') and one grapefruit cultivar (Citrus paradisi 'Changshanhuyu'), was investigated using high-performance liquid chromatography diode array detection electrospray ionisation mass spectrometry (HPLC-DAD-ESI MS/MS). Twenty-eight flavonoids were identified. Naringin was the predominant flavanone in these pummelo varieties, whereas naringin and neohesperidin were the principal flavanones found in C. paradisi 'Changshanhuyu'. The four pummelo cultivars had higher levels of flavones when compared with the grapefruit. Based on the flavonoid profiles in flavedos and juices, four pummelo cultivars and one grapefruit cultivar were well separated. (C) 2011 Elsevier Ltd. All rights reserved.