Abstract
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.
Highlights
The algae are the immense rich sources of metabolites including proteins, lipids, antioxidants like the polyphenols
Our results are comparable to work for Ulva lactuca, with respect to the dry matter: 11% (Yaich et al, 2011) and 19.6% (Ortiz et al, 2006)
Ukrainian Journal of Ecology, 10(4), 2020 obtained for light petroleum is evaluated at 2% and 8.8% in Ulva lactuca sp and Cystoceira stricta respectively; while there are 7.9% and 2.07% for methanol respectively (Table 1)
Summary
The algae are the immense rich sources of metabolites including proteins, lipids, antioxidants like the polyphenols. Algae are very diverse and constitute a heterogeneous group to the extent that they do not all belong to the same evolutionary path but to very different phylogenetic groups, illustrated by large variations in their physiologies and metabolism, reflecting a great genetic diversity (Cabioc, 1992) They are used around the world in a broad spectrum (Fleurence,1999) on one hand as a source of food for their high nutritional values, justified by the presence of a varied and abundant mineral fraction, that constitutes an important contribution of macroelements and trace elements in non-negligible quantity of protein, well balanced in general in amino acids, and a varied vitamin content where most of the vitamins are represented in a low lipid fraction.
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