Table 6. Flavonoids of whole onion by growth stage (unit: mg/100 g FW)

Growth stage		Spiraeoside (Quercetin-4’-O-glucoside)	Quercetin	Isorhamnetin (Quercetin-3’-methylether)	Total flavonoid compounds (Rutin eq.)
Whole onion	16 weeks	7.93±0.12e1)	10.4±0.14e	2.37±0.18c	203.0±8.03a
	17 weeks	5.89±0.08f	7.63±0.10f	1.79±0.04d	160.0±7.42b
	19 weeks	2.65±0.02g	1.52±0.03g	1.04±0.04e	136.3±0.85c
	21 weeks	25.6±0.14c	35.6±0.09d	2.88±0.07b	110.9±3.48d
	23 weeks	19.9±0.07d	37.8±0.04c	2.38±0.17c	103.8±3.13e
	25 weeks	68.9±0.39a	67.4±0.60a	2.96±0.03b	90.02±5.12f
Onion bulb		40.0±0.10b	61.7±0.10b	3.41±0.01a	46.30±1.40g
Green onion		ND	ND	ND	33.96±0.19h

Values are expressed as mean±SD (n=3). Means with different superscripts within each column are significantly different (p<0.05) by Duncan’s multiple range test.