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Our research includes biochemical study, evaluation of anti-oxidant activities and heavy metals contamination in Ulva lactuca and Cystoseira stricta collected at the site of Sidi El Adjel (Mostaganem). We registered a total phenol content in Ulva lactuca and Cystoseira stricta were 0.383 5.43 mg EAG/g MS respectively. The polyphenols contamination caused the significant antioxidant effects on DPPH. The yield of crude extract for petroleum ether were 2 and 8.8% in Ulva lactuca sp and Cystoceira stricta, whereas it were 7.9 and 2.07% for the methanol respectively. We noted the ability of studied algae extracts to reduce the DDPH. A low total lipid content was 4 and 5.5% in Cystoseira stricta and Ulva lactuca respectively, whereas the appreciable crude protein contents wad 21 and 30.6%. Chemical analyzes of our algae reveal levels estimated at 22% in Ulva lactuca sp, and 19.4% in cystoseira stricta. We estimated high zinc concentrations, which were 187.59 and 298.64 ppm. PS in Cystoseira stricta and Ulva lactuca respectively.

Biochemical study of Ulva lactuca and Cystoseira stricta from Mostaganem coastline (Western Algeria)