Table 2 Changes in flavonoid contents of peel extracts from five orange cultivars harvested at different maturation stages (unit: 'g/mL)

Cultivar	Date	Flavone	Flavanone				Polymethoxylflavones
		Rutin	Narirutin	Naringin	Hesperidin	Neohesperidin	Nobiletin	Tangeretin
		Tarocco blood	9/15	9.47	54.86	ND1)	70.50	ND	23.96	2.11
	11/15	3.13	19.67	ND	14.65	ND	7.68	0.92
	1/15	3.71	20.01	ND	14.87	ND	8.51	1.10
Sanguinello blood	9/15	11.32	71.44	0.29	69.36	ND	28.70	4.13
	11/15	3.46	31.35	ND	18.28	ND	13.86	1.85
	1/15	5.47	19.06	ND	16.38	ND	6.32	ND
Hamlin sweet	9/15	26.51	171.24	ND	92.80	ND	40.22	6.60
	11/15	20.41	95.17	ND	34.14	ND	15.08	2.21
	1/15	4.82	42.22	ND	18.50	ND	5.50	0.60
Shamouti	9/15	7.28	135.13	ND	63.79	ND	22.93	3.01
	11/15	5.77	40.19	ND	20.15	ND	10.20	1.15
	1/15	3.25	22.64	ND	12.72	ND	5.71	ND
Olinda valencia	9/15	7.64	77.83	ND	41.95	ND	36.47	3.80
	11/15	3.57	31.51	ND	21.47	ND	16.50	1.73
	1/15	4.64	19.32	ND	14.01	ND	10.47	0.91

ND, not detected.