Table 4 DPPH and ABTS radical scavenging ability of acorn (Quercus species) tea treated by steaming, drying, and roasting methods

Sample1)	DPPH radical scavenging ability (%)	ABTS radical scavenging ability (%)
Control	35.70±1.062)^d3)	89.58±0.06^d
SR	54.85±0.91^b	95.96±0.04^b
HDR	75.66±1.90^a	98.16±0.03^a
SHDR	43.57±1.00^c	93.75±0.17^c

Control, Roasting; SR, Steaming and roasting; HDR, Hot air drying and roasting; SHDR, Steaming and hot air drying and roasting.
Values are means±SD of triplicate determinations.
Different superscripts within a column (a-d) indicate significant differences (p<0.05).