Table 3
Electron donating abilities of 70% ethanol extracts of grape seed prepared with different drying methods

Samples¹⁾	Concentration(μg/mL)			Positive control²⁾(50μg/mL)
Samples¹⁾	50	100	500	AA	BHA	BHT
GSFD	23.50±1.47^a3)	38.87±0.53^a	88.71±0.75^a	97.82±0.15^A	82.61±1.05^B2	20.96±1.45^C
GSIR	8.36±0.29^b	24.99±3.31^c	952.62±2.50^c
GSHD	10.13±1.23^b	25.01±0.56^c	65.20±1.54^b
GSSD	9.39±0.54^b	28.76±1.38^b	65.22±0.52^b

¹⁾Abbreviations: GSFD, ethanol extract of grape seed with freeze drying; GSIR, ethanol extract of grape seed with infrared drying; GSHD, ethanol extract of grape seed with heat air drying; GSSD, ethanol extract of grape seed with sun drying.
²⁾AA, L-ascorbic acid; BHA, butylated hydroxyanisole; BHT, butylated hydroxytolune.
³⁾Values are means±SD of triplicate determinations. Different superscripts within a column (a-c) and row (A-C) indicate significant differences (p<0.05).