Extracts     Concentration(µg) 100 200 300 400 SPS extracted with hot water from Spirulina 40.04* 45.44* 46.37* 49.03* grown on medium containing 45 ppm nitrogen ±0.025 ±0.035 ±0.025 ±0.076 SPS extracted with hot water from Spirulina 39.41* 44.84 49.96* 51.81* grown on medium containing 128 ppm nitrogen ±0.025 ±0.020 ±0.015 ±0.020 SPS extracted with hot water from Spirulina 51.91* 57.74* 59.57* 71.12* grown on medium containing 293 ppm nitrogen ±0.021 ±0.035 ±0.025 ±0.020 SPS extracted with ethanol from Spirulina 34.17* 41.11* 46.69* 64.48* grown on medium containing 45 ppm nitrogen ±0.020 ±0.076 ±0.776 ±0.020 SPS extracted with ethanol from Spirulina 34.47* 38.77* 42.23* 56.09 grown on medium containing 128 ppm nitrogen ±0.020 ±0.153 ±0.025 ±0.012 Trolox 92.35 95.66 98.23 99.45   ±0.020 ±0.020 ±0.038 ±0.131 Data are means of triplicate ±SD. *.The mean difference is significant at P≤ 0.05

Table 8: Antioxidant activity of sulfated polysaccharides extracts assessed by ABTS+.

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