3.2. Antioxidant activity of dried product of S. lomentaria
The antioxidant activities of extract solutions of S. lometaria were determined by the method of Kuo et al. (1999) using the hemoglobin-induced linoleic acid system. This method could evaluate the results with only 1 h for oxidation time. Generally antioxidant assays with linoleic acid need more autioxidation for 5-6 days.
The antioxidant activities of WE and LE were dose-dependent and reached a plateau(about 95% inhibition) with a concentration of 10 mg DS per ml solvent(Fig. 1). From results of 50% inhibition concentration(C50%) of the oxidation, antioxidant activities of WE and LE were 22.2 and 10 mg CatE/g DS, respectively Clear antioxidant activities of EE, CF and CA were not detected at any concentration.