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Antibacterial activity of four Gracilaria species of red seaweeds collected from Mandapam Coast,Gulf of Mannar Marine Biosphere Reserve,India

引用

Journal of Coastal Life Medicine 2016年第9期4卷 703-707页

作者： Sethu Rameshkumar kolidoss radhakrishnan Arasan Sreenivasan Samraj Aanand Department of Marine Science Bharathidasan UniversityTiruchirapalli-620024Tamil NaduIndia Department of Fisheries Environment Fisheries College and Research InstituteTuticorin-628008Tamil NaduIndia

Objective:To study the antibacterial activities of diethyl ether,toluene,ethanol and methanol extracts of red seaweeds such as Gracilaria crassa(***),Gracilaria folifera(***),Gracilaria debilis(***)and Gracilaria ***:The crude extracts were tested against different types of Gram-positive and-negative bacterial strains and all the seaweed extracts were tested a broad spectrum of antibacterial *** activity was made using paper disc diffusion *** organic solvents(diethyl ether,toluene,methanol and ethanol)were used separately in a Soxhlet apparatus for seven bacterial *** activity of the known antibiotics such as chloramphenicol,streptomycin,kanamycin and ampicillin was determined by testing them against different test ***:The high antibacterial activity was noted in the extracts of ***,*** and ***,*** and *** have good antibacterial *** like Bacillus subtilis and Escherichia coli were less susceptible to the methanol and diethyl ether extracts of *** comparative study on the antibacterial activity was also made by using 200μg concentration of solvent extracts(diethyl ether,ethanol,toluene and methanol)and different five antibiotics such as chloramphenicol,streptomycin,kanamycin,amoxicillin and *** bacterial strains tested were more sensitive to chloramphenicol,streptomycin,kanamycin,and ampicillin when compared to algal ***:The present study proved that the extracts of ***,*** and *** have high antibacterial *** *** and *** showed good antibacterial activity,many known antibiotics are active against a few organisms ***,the extracts of seaweeds were active against all test organisms used and the activities were comparable to that of antibiotics and the seaweeds offer a feasible alternative for the development of new *** r

关键词： Seaweeds Gracilaria species Antibacterial activity Bacterial strains Gram-positive and-negative bacteria

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