Table 2.
Relative ratio of antioxidant activity to the yield of hot water extract

Extraction condition1)	ABTS assay	Alkyl assay	DPPH assay	SOD assay	MTT assay
AE	1.90	2.32	1.72	1.65	1.84
OE	1.36	1.86	1.39	1.36	1.06
HWSE	1.29	1.81	1.58	1.25	1.06
HWASE	1.002)	1.00	1.00	1.00	1.00
BE	1.58	2.15	1.37	1.37	1.07

AE, autoclave extraction; OE, oven extraction; HWSE, hot water & sonication extraction; HWASE, hot water & 0.5% (v/v) acetic acid & sonication; BE, boiling extraction.
Relative ratio of antioxidant activity to yield were calculated by normalizing the ratio by that of HWASE.