Table 3. Radical scavenging antioxidant activities of 70% ethanol extracts of seaweeds from HHGDM and FDM

Sample name	Drying method	IC₅₀ values for radical scavenging activity (µg/ml)
Sample name	Drying method	DPPH	Alkyl	Hydroxyl
Padina arborescens	HHGDM	585.15 ± 3.86	245.89 ± 12.3	211.63 ± 6.55
Padina arborescens	FDM	628.84 ± 21.40	280.62 ± 20.05	232.45 ± 6.12
Sargassum autumnale	HHGDM	178 ± 8.14	181.00 ± 1.36	159.69 ± 4.33
Sargassum autumnale	FDM	227.28 ± 1.81	183.51 ± 1.43	162.57 ± 5.56
Sargassum thunbergii	HHGDM	83.6 ± 3.24	120.72 ± 12.68	99.54 ± 4.74
Sargassum thunbergii	FDM	92.87 ± 4.74	150.01 ± 4.53	112.22 ±5.45
Ishige okamurae	HHGDM	28.14 ± 2.85	63.76 ± 8.46	52.45 ± 2.34
Ishige okamurae	FDM	33.74 ± 0.96	95.26 ± 4.59	83.12 ± 3.21

Experiments were carried out in triplicate, and the results are represented as mean ± SD.
HHGDM, hybrid hot-water Goodle drying method; FDM, freeze drying method; DPPH, 1,1-diphenyl-2-picrylhydrazyl.