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Egyptian Journal of Aquatic Biology and Fisheries
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W. M. Hassan, S., H. Shobier, A. (2018). GC/MS identification and applications of bioactive seaweed extracts from Mediterranean coast of Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 22(5 (Special Issue)), 1-21. doi: 10.21608/ejabf.2018.17952
Sahar W. M. Hassan; Aida H. Shobier. "GC/MS identification and applications of bioactive seaweed extracts from Mediterranean coast of Egypt". Egyptian Journal of Aquatic Biology and Fisheries, 22, 5 (Special Issue), 2018, 1-21. doi: 10.21608/ejabf.2018.17952
W. M. Hassan, S., H. Shobier, A. (2018). 'GC/MS identification and applications of bioactive seaweed extracts from Mediterranean coast of Egypt', Egyptian Journal of Aquatic Biology and Fisheries, 22(5 (Special Issue)), pp. 1-21. doi: 10.21608/ejabf.2018.17952
W. M. Hassan, S., H. Shobier, A. GC/MS identification and applications of bioactive seaweed extracts from Mediterranean coast of Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 2018; 22(5 (Special Issue)): 1-21. doi: 10.21608/ejabf.2018.17952

GC/MS identification and applications of bioactive seaweed extracts from Mediterranean coast of Egypt

Article 1, Volume 22, 5 (Special Issue), November 2018, Page 1-21  XML PDF (590.42 K)
Document Type: Original Article
DOI: 10.21608/ejabf.2018.17952
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Authors
Sahar W. M. Hassan1; Aida H. Shobier2
1Marine Microbiology Lab, Division of Marine Environment, National Institute of Oceanography and Fisheries, Egypt
2Marine Pollution Lab, Division of Marine Environment, National Institute of Oceanography and Fisheries, Egypt
Abstract
The antibacterial activity of different seaweed species against five fish
pathogens (A. hydrophila, V. parahaemolyticus, V. alginolyticus, V. damsela and
Vibrio sp.) has been evaluated. The ethanolic extract of C. sinuosa (CSE1) and
dichloromethane extract of C. officinalis (COM) exhibited the highest antibacterial
activity with activity index (AI) = 1.4 ±0.74 and 1.2 ±0.71, respectively. When the
extracts were encapsulated into calcium alginate beads their antibacterial activity
against the most susceptible bacterial pathogens showed that the significant growth
inhibition was against V. parahaemolyticus after 5 min post addition of the beads
recording 1.4 and 2 fold decrease in the growth, respectively. Recycling of the
(CA/COM) beads was carried out for 7 successive cycles with success in
elimination of V. parahaemolyticus. The potential applications of encapsulated
extracts for elimination of microbial load in fish rearing water and antifouling
activity were proved in the current investigation. The chemical composition of the
bioactive extracts (CSE1) and (COM) was determined using GC/MS analysis
which revealed the presence of several constituents that have been reported to
exhibit antimicrobial activity. Additionally, the dichloromethane extract (COM)
produced six major components including n-nonadecane, 1,2,3-
propanetricarboxylic acid, 2-(acetyloxy)-, tributyl ester, 2-methylhexadecan-1-ol,
1-docosene, 1-eicosanol and chloroacetic acid, octadecyl ester. However, the
ethanolic extract (CSE1) was characterized by the presence of fatty acids, fatty
acids ethyl esters and aromatic hydrocarbon where the most abundant compound
was n-tridecanoic acid ethyl ester.
Keywords
C. sinuosa; C. officinalis; n-Hexadecanoic acid; Encapsulation; Antibacterial activity; Antifouling activity
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