Table 3. Functional ingredients and antioxidant capacity of two leafy vegetables according to cultivation type

		Batavia
		Hydroponically grown		Soil-grown
		BAH1	BAH2	BAH3	BAN
		Mean SD	Mean SD	Mean SD	Mean SD
Total polyphenols	(mg/kg)	219.68c±7.56	232.49c±6.49	307.98b±6.49	346.42a±14.81
Total flavonoids	(mg/kg)	193.10b±4.67	200.98b±2.42	234.68a±5.04	238.10a±8.63
DPPH radical scavenging activity	(EDA%)	76.70b±1.32	78.22b±0.52	87.95a±0.06	89.06a±1.91
ABTS radical scavenging activity	(Inhibition%)	73.81b±2.00	74.85ab±1.51	74.99ab±1.83	77.63a±2.04

		Butterhead
		Hydroponically grown		Soil-grown
		BUH1	BUH2	BUH3	BUN
		Mean SD	Mean SD	Mean SD	Mean SD
Total polyphenols	(mg/kg)	196.34c±4.82	241.18b±8.35	234.32b±7.26	340.93a±3.96
Total flavonoids	(mg/kg)	137.07d±5.33	159.86c±8.06	194.25b±8.83	273.25a±1.76
DPPH radical scavenging activity	(EDA%)	84.34b±0.46	87.14a±0.82	87.54a±0.57	87.71a±1.08
ABTS radical scavenging activity	(Inhibition%)	74.61a±3.83	75.55a±2.14	77.44a±1.10	77.96a±1.57

Average of measurements (n=3)±standard deviation
Mean values with the same letter in a row are not significantly different at p<0.05.
Hydroponically grown batavia: BAH1 (farm A), BAH2 (farm B), BAH3 (farm C); butterhead: BUH1 (farm A), BUH2 (farm B), BUH3 (farm C)
Soil-grown batavia: BAN (farm D); butterhead: BUN (farm D).