Biological Effect of Posidonia oceanica Seaweed on Some Pathogenic Microbes


  • Ahmed Amrajaa Abdulrraziq Department of Biology, Faculty of Education, Omar Al-Mukhtar University, Al-Bayda, Libya
  • Sami Mohammed Salih Department of Biology, Faculty of Education, Omar Al-Mukhtar University, Al-Bayda, Libya



Posidonia oceanica, Biological Effect, Pathogenic Microbes


Compared to other coasts, Libyan coasts are characterized by low levels of pollution. This makes them a suitable environment for marine diversity, especially seaweeds, which may be considered a source of new compounds that are biologically active in their resistance to microbes. Therefore, the present study was conducted with the aim of testing the bioactivity of leave and rhizome extracts of Posidonia oceanica seaweed (aqueous, ethanol, and acetone) at concentrations (50, 100, and 150) mg/ml against three types of pathogenic bacteria (Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa), and fungus (Candida spp.), by a sensitivity test in the form of a disk diffusion method. The results showed that Posidonia oceanica seaweed extracts have good inhibitory activity against S.aureus and Candida spp., and that the concentration of 150 mg/ml is the most effective for all extracts. The results also indicated that rhizome extracts are more efficient than leaf extracts, and the acetone extract is the best in inhibiting the tested microbes. Also, Escherichia coli and Pseudomonas aeruginosa are the most resistant to all extracts, regardless of type and concentration used.



Download data is not yet available.


Metrics Loading ...


Abdulrraziq, A. A. and Salih, S. M. (2020). Effect of Aqueous Extracts of Arum cyreniacum on Some Negative and Positive Gram bacteria. Al-Mukhtar Journal of Sciences 35 (1): 60-68, 2020. DOI:

Agbaje-Daniels, F. Adeleye, A. Nwankwo, D. Adeniyi, B. Seku, F. and Beukes, D. (2020). Antibacterial Activities of Selected Green Seaweeds from West African Coast. EC Pharmacology and Toxicology, 8(4) :84-92.

Alnamer, R. Alaoui, K. Doudach, L. Bouidida, E. L. Chibani, F. Al-Sobarry, M. Benjouad, A. and Cherrah, Y. (2013). In Vitro Antibacterial Activity Of Rosmarinus Officinalis Methanolic And Aqueous Extracts. International Journal Of Pharmacy, vol. 3(1): p 1-6.

Alshalmani, S. K. Zobi, N. H. and Bozakouk, I. H. (2014). Antibacterial activity of Libyan seaweed extracts. International Journal of Pharmaceutical Sciences and Research, 5(12), 5425.‏

Atia, A. (2018). The need for implementing antibiotic stewardship programs in Libya. Libyan Journal of Medical Sciences, Year 2018, Volume 2, Issue 4 , p. 125.

‏Benito-Gonzalez, I. Lopez-Rubio, A. Martínez-Abad, A. Ballester, A. R. Falco, I. Gonzalez-Candelas, L. and Martínez-Sanz, M. (2019). In-depth characterization of bioactive extracts from Posidonia oceanica waste biomass. Marine drugs, 17(7): 409. DOI:

Berfad, M. A. and Alnour, T. M. (2014). Phytochemical analysis and Antibacterial activity of the 5 different extract from the seagrasses Posidonia oceanica. J Med Pl St, 2(4), 15-18.‏

Berfad, M. A. Fahej, M. A. S. Kumar, A. and Edrah, S. (2013). Preliminary Phytochemical and Antifungal Studies of Sea Grass, Posidonia oceanica obtained from Mediterranean Sea of Libya. IJSR. Vol,4(5):30-33.

Cozza, R., Chiappetta, A., Petrarulo, M., Salimonti, A. Rende, F. Bitonti, M. B. and Innocenti, A. M. (2004). Cytophysiological features of Posidonia oceanica as putative markers of environmental conditions. Chemistry and Ecology, 20(3), 215-223.‏ DOI:

Ettinger, C. L., and Eisen, J. A. (2019). Characterization of the mycobiome of the seagrass, Zostera marina, reveals putative associations with marine chytrids. Frontiers in microbiology, 10, 2476. DOI:

Ezziany, I. M. Haddoud, D. and Barah, M. (2015). Estimating Distribution of two Libyan Seagrass Species, Posidonia oceanica and Cymodocea nodosa, that face a Future Decline in Khoms to Misurata in Libyan Shores. International Journal of Agriculture and Economic Development, 3(1), 15.‏

Haznedaroglu, M. Z. and Zeybek, U. (2007). HPLC Determination of Chicoric Acid in Leaves of Posidonia oceanica. Pharmaceutical biology, 45(10), 745-748.‏ DOI:

Lamb, J. B. van de Water, J. A. J. M. Bourne, D. G. Altier, C. Hein, M. Y. Fiorenza, E. A. Abu, N. Jompa, J. and Harvell, C. D. (2017). Seagrass ecosystems reduce exposure to bacterial pathogens of humans, fishes, and invertebrates. Science 355(6326): 731–733. DOI:

Larkum, A. W. D. (2006). Taxonomy and biogeraphy of Seagrasses. in: Seagrasses: Biology, Ecology and Conservation. Edited by C. den Hartog, and John Kuo. Springer (Netherlands), 1-23.

Lee, S. Y. Kim, B. Shin, D. C. Park, K. S. and Yang, J. C. (2016). A study of antimicrobial effect of Zostera marina extracts. Journal of the Korean Applied Science and Technology, 33(2), 225-231. DOI:

Mayer, A. M. Rodríguez, A. D. Berlinck, R. G. and Hamann, M. T. (2007). Marine pharmacology in 2003–4: Marine compounds with anthelmintic antibacterial, anticoagulant, antifungal, anti-inflammatory, antimalarial, antiplatelet, antiprotozoal, antituberculosis, and antiviral activities; affecting the cardiovascular, immune and nervous systems, and other miscellaneous mechanisms of action. Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology, 145(4), 553-581.‏ DOI:

McHugh, D. J. (2003). A guide to the seaweed industry FAO Fisheries Technical Paper 441. Food and Agriculture Organization of the United Nations, Rome.

Orhan, I. (2003). Wisespongpand P, Atici T, Sener B. Toxicity properties of some marine and fresh-water Algae as their chemical defense. Ankara Ecz Fak Derg, 32(1):19-29.

Piva, G. Fracassetti, D. Tirelli, A. Mascheroni, E. Musatti, A. Inglese, P. Piergiovanni, L. and Rollini, M. (2017). Evaluation of the antioxidant /antimicrobial performance of Posidonia oceanica in comparison with three commercial natural extracts and as a treatment on fresh-cut peaches (Prunus persica Batsch). Postharvest Biol. Technol, 124, 54–61. DOI:

Shanmughapriya, S. Manilal, A. Sujith, S. Selvin, J. Kiran, G. S. and Natarajaseenivasan, K. (2008). Antimicrobial activity of seaweeds extracts against multiresistant pathogens. Annals of Microbiology, 58 (3), 535-541.‏ DOI:

Valentina, J. Poonguzhali, T. V. and Josmin, L. N. L. L. (2015) Phytochemical Analysis of selected Seaweeds collected from Mandapam coast in Rameshwaram, Tamilnadu, India. Int. Jour. Of AdvRes., 3, 972-976.



How to Cite

Abdulrraziq, A. A., & Salih, S. M. . (2020). Biological Effect of Posidonia oceanica Seaweed on Some Pathogenic Microbes. Al-Mukhtar Journal of Sciences, 35(4), 339–346.



Research Articles


Most read articles by the same author(s)

Obs.: This plugin requires at least one statistics/report plugin to be enabled. If your statistics plugins provide more than one metric then please also select a main metric on the admin's site settings page and/or on the journal manager's settings pages.