Synergistic effect of Padina pavonica and Cystoseira compressa in antibacterial activity and retention of heavy metals


F.Z. Abdeldjebbar*, F. Bennabi, A. Ayache, M. Berrayah and S. Tassadiat

Algae are an infinite and important source of active molecules with original chemical structures and natural bioactive substances. Therefore, they are significant in the accumulation and neutralization of various pollutants. Within the framework of two species of brown algae valorization, Cystoseira compressa and Padina pavonica were collected at the level of the Algerian west coast (Stidia beach), a study was carried out initially to evaluate the antibacterial activity concerning two bacterial strains (Staphylococcus aureus and Escherichia coli). Secondly, a test of neutralization of two heavy metals was carried out to determine the absorbing effect of these two algae. This test will help to follow the degree of metallic contamination by the (Cadmium and Lead) at the level of the coastal zone of the Algerian west. The results of the antibacterial activity showed a significant cooperative effect of the mixture of the two algae, where we were able to increase the inhibition diameter to 16 mm and determine the MIC for the E. coli strain. For the test of neutralization, a dosage of cadmium and lead of the seawater was carried out; the results obtained showed a rate of elimination of 15 % Cd for Cystoseira compressa and 8 % Pb for the mixture of the two algae. In the light of the obtained results, we notice the absence of the antagonistic effect between the two algae where the interest of using these algal supports in the treatment of polluted waters.

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