Extracts Scavenging% Concentration(µg) 100 200 300 SPS extracted with hot water from Spirulina 30.55*٭ 32.05*٭ 35.36*٭ grown on medium containing 45 ppm nitrogen ±0.020 ±0.025 ±0.03 SPS extracted with hot water from Spirulina 39.73*٭ 40.67*٭ 68.29*٭ grown on medium containing 128 ppm nitrogen ±0.026 ±0.02 ±0.02 SPS extracted with hot water from Spirulina 28.23*٭ 35.69*٭ 44.66*٭ grown on medium containing 293 ppm nitrogen ±0.020 ±0.025 ±0.02 SPS extracted with ethanol from Spirulina 26.37*٭ 28.05*٭ 30.05*٭ grown on medium containing 45 ppm nitrogen ±0.020 ±0.02 ±0.006 SPS extracted with ethanol from Spirulina 25.75*٭ 26.63*٭ 30.16*٭ grown on medium containing 128 ppm nitrogen ±0.020 ±0.025 ±0.025 BHA 88.54 95.22 99.41   ±0.020 ±0.02 ±0.025 BHT 85.57* 94.76* 98.15*   ±0.025 ±0.031 ±0.046 Data are means of triplicate ± SD (*)The mean difference is significant at P≤ 0.05 relative to BHA (*)The mean difference is significant at P≤ 0.05 relative to BHT

Table 7: Antioxidant activity of sulfated polysaccharides extracts assessed by DPPH.

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