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  • WJPPS SEPTEMBER ISSUE PUBLISHED
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Abstract

EVALUATION OF THE INHIBITORY ACTIVITY OF BROWN ALGAE EXTRACTS, PADINA PAVONICA (L.), HARVESTED ON TUNISIAN COASTS

Helmi Tazarki*, Dhbaibi Kais, Marwa Khammassi, Houda Ben Yahia and Jameleddine Khiari

ABSTRACT

The objective of the present work is to highlight the antibacterial activity of the four extracts of a marine algae species: Padina pavonica, from the coast of the Daroufa Tunisia beach. this alga has high levels of total polyphenols (51,912 ± 3,261 powder). Screening of the in vitro antibacterial activity of Padina pavonica extracts harvested on the Mediterranean coast of Cap Bon, Tunisia, was carried out on five strains of bacteria: Salmonella enterica, Escherichia coli, Bacillus subtilis, Micrococcus luteus and Staphylococcus aureus. The antimicrobial activity was evaluated by the cellulose disk diffusion method. The results revealed that the total extract of Padina pavonica exhibits significant activity against Bacillus subtilis, Micrococcus luteus, Staphylococcus aureus and Escherichia coli whereas no activity was recorded against Salmonella enterica ssp. The antibacterial activity of the Methanolic extract of the brown alga Padina pavonica shows that most of the bacterial strains tested are sensitive, the largest diameter of inhibition (22.4 ± 0.16 mm) vis-à-vis Bacillus subtilis at a concentration of 3 mg/ml. Modest antibacterial activity was noted for the same extract against the strain Micrococcus luteus and the lowest diameter of inhibition was detected against the strain Salmonella enterica ssp.

Keywords: Brown algae, Padina pavonica (L), antioxidant activity, antibacterial activity, Tunisian coast.


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