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Antibacterial and antioxidant effects from seaweed,Sargassum wightii(Greville,1848)against marine ornamental fish pathogens

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Journal of Coastal Life Medicine 2014年第10期 773-783页

作者： karuppiah nanthini devi Thipramalai Thankappan Ajith Kumar Thangavel Balasubramanian CAS in Marine Biology Faculty of Marine SciencesAnnamalai UniversityTamil NaduIndia

Objective:To screen seaweed Sargassum wightii(***)for bioactive natural substance against marine ornamental fish bacterial pathogens,and also study the antioxidant properties,brine shrimp toxicity ***:Crude extract was made using three solvents(acetone,ethanol and methanol)and screened for antibacterial activity and purified by column chromatography,purified fractions obtained were tested for the *** 1st fraction of acetone extract showed maximum activity,this was again subjected for purification and obtained three sub-fractions also tested for the *** phenols and flavonoid contents,reducing power,free radical scavenging activities(DPPH and H_(2)O_(2))and brine shrimp toxicity were also studied using purified acetone extract followed by standard ***:The purified acetone extract showed maximum activity against eight pathogens among ***-MS results revealed two major compounds such as 24-methylene cholesterol(79.9%)and methyl oleate(30.3%)which presented in higher percentage in purified extract and had highest phenols and flavonoid contents,reducing power,free radical scavenging activities,and also showed less toxicity *** he present study,the purified extract of *** had potential antibacterial activity against Aeromonas hydrophila[(22.25±0.35)mm]and minimum activity against Streptococcus sp.[(10.00±0.00)mm].The purified extract of *** also had potential total antioxidant activity of(3.87±0.04)μg at 100μg/mL concentration and the lowest activity was exhibited(1.52±0.01)μg at 25μg/***:The present study concluded that the brown seaweed,*** has potential antimicrobial and antioxidant activities,which can be used in aquaculture industry for treated bacterial diseases in infected fishes.

关键词： Seaweed Bioactive compounds Antibacterial activity Silica gel column chromatography GC-MS analysis Antioxidant activity assays Brine shrimp toxicity

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Marine natural product,Pyrrolo[1,2-a]pyrazine-1,4-dione,hexahydro-(C_(7)H_(10)N_(2)O_(2))of antioxidant properties from Bacillus species at Lakshadweep archipelago

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Journal of Coastal Life Medicine 2014年第8期 632-637页

作者： Mohan Gopi Nagarajan Balachandran Dhayanithi Karuppaiah nanthini devi Thipramalai Thankappan Ajith Kumar Centre of Advanced Study in Marine Biology Faculty of Marine SciencesAnnamalai UniversityParangipettai–608502Tamil NaduIndia Centre for Marine Living Resources and Ecology-Field Research Station Agatti Island-682553LakshadweepIndia

Objective:To investigate the antioxidant property of purified bioactive compound from sponge associated bacteria Bacillus ***:The potential active compound was subjected for assay of total antioxidant activity,α,α-diphenyl-α-picrylhydrazyl(DPPH)radical scavenging activity,nitric oxide radical scavenging activity,hydrogen peroxide(H_(2)O_(2))scavenging activity and total reducing ***,the 16S rRNA gene sequence was carried out to identify the sponge symbiotic ***:The results showed linear increase of total antioxidant activity,DPPH radical scavenging activity,nitric oxide radical scavenging activity,H_(2)O_(2)scavenging activity and total reducing ***_(50)value of the active compound for DPPH activity,H_(2)O_(2)scavenging activity,nitric oxide scavenging activity was recorded as 15.025μg/mL,23.73μg/mL,and 41.70μg/mL *** potential strain was identified as Bacillus species from GenBank database(GenBank Accession number JX985748).Conclusions:The present study has reported the antioxidant property of purified bioactive compound from sponge associated Bacillus *** report will be helpful to pharmaceutical and antioxidant researchers for further studies.

关键词： Secondary metabolites Antioxidant activity Bacillus species Lakshadweep archipelago

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