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Evaluation of phenolic contents and antioxidant activities of brown seaweeds belonging to Turbinaria spp.(Phaeophyta,Sargassaceae) collected from Gulf of Mannar

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Asian Pacific Journal of Tropical Biomedicine 2013年第1期3卷 8-16页

作者： Kajal Chakraborty Nammunayathuputhenkotta Krishnankartha Praveen Kodayan Kizekadath Vijayan Gonugontla Syda Rao Marine Biotechnology Division Central Marine Fisheries Research Institute Central Marine Fisheries Research Institute

Objective:To evaluate the antioxidant activities and total phenolic contents of brown seaweeds belonging to Turbinaria spp.[Turbinaria conoides(***)and Turbinaria ornata(***)collected from Gulf of Mannar of southeastern coast of India in various in vitro ***:The antioxidant activity was evaluated using different in vitro systems,viz.,I,I-diphenyl-2-picrylhydrazyl(DPPH),2,2'-azino-bis-3 ethylbenzothiozoline-6-sulfonic acid diammonium salt(ABTS),H_20_2/H0 radical scavenging,Fe^(2+)ion chelating ability,and reducing ***-Ciocalteu method was used to determine the total phenolic content of the extracts,and the results were expressed as mg of gallic acid equivalents(GE)/g of the seaweed *** acid-reactive substances assay was employed to assess the ability of the seaweed extracts to inhibit lipid ***:Ethyl acetate(EtOAc)fraction of *** registered significantly higher phenolic content(105.97 mg GE/g)than that of ***(69.63 mg GE/g).Significantly higher antioxidant potential as determined by DPPH(64.14%)radical scavenging activity was registered in EtOAc fraction of ***.A higher ABTS(?)radical scavenging(IC_(50)3.16μg/mL),Fe^(2+)chelating(IC_(50)0.46 mg/mL),H_2O_2 scavenging(IC_(50)4.25 mg/mL),lipid peroxidation inhibitory(TBARS,IC_(50)0.21 mg/mL),and reducing abilities(IC_(50)52.67 mg/mL)(P<0.05)were realized in EtOAc fraction of *** than other ***:This study indicated the potential use of *** and *** as candidate species to be used as food supplements/functional foods to increase shelf-life of food items for human consumption,and nutraceuticals to deter deleterious free radical-induced life-threatening diseases.

关键词： Brown seaweeds Turbinaria conoides Turbinaria ornata Antioxidant activity Total phenolic contents

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Characterization and screening of in vitro antimalarial and larvicidal activities of selected seaweeds from southeast coast of India against Plasmodium falciparum andAnopheles stephensi

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Journal of Coastal Life Medicine 2017年第6期5卷 242-248页

作者： Rajamani Sowmiya Govindasamy Balasubramani Paramasivam Deepak Dilipkumar Aiswarya Sundaram Ravikumar SundaramPrasannakumar Pachiappan Perumal Department of Biotechnology School of BiosciencesPeriyar UniversityPeriyar Palkalai NagarSalemTamil Nadu636011India Department of Oceanography and Coastal Area Studies School of Marine SciencesAlagappa UniversityThondi CampusRamanathapuramTamil Nadu623409India

Objective:To investigate the antimalarial and larvicidal activities of seaweeds against Plasmodium falciparum strain andAnopheles stephensi mosquito larva. Methods: The three different seaweeds,Jania rubens,Turbinaria ornata (T. ornata) and Ulva fasciata were collected from Southeast India. The seaweeds were extracted using hexane and ethyl acetate solvents and evaluated for their mosquito-larvicidal and antiplasmodial property. The bioactive compounds of the seaweed extract were studied by Fourier transform infrared spectroscopy and gas chromatography-mass spectrometry. Results:The hexane extract ofT. ornata (HTO) has shown significant inhibitory effects at the IC50 value 22.98 μg/mL, when compared to the positive control, chloroquine (12.32 μg/mL). The larvicidal activity of HTO on the fourth instar larvae of Anopheles stephensi was found to be effective with the LC50 and LC90 values (μg/mL) of 1.38 and 3.34. The Fourier transform infrared spectroscopy analysis ofHTO revealed the presence of alkenes, aromatics, amides and amines groups, whereas in gas chromatography-mass spectrometry, 11 different bioactive components were recorded. The bioactive component, hentriacontane in the HTO might be responsible for the recorded antiplasmodial and larvicidal activities. Conclusions:The finding of the present study reveals that the constituents of T. ornata have new sources of antimalarial and larvicidal agents in future.

关键词： Anopheles stephensi FT-IR GC-MS Plasmodium falciparum Turbinaria ornata

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