Species Of Phaeophyta Research Articles

Macroalgal community structure and composition in intertidal zone of Sarangan Beach, Gunungkidul, Indonesia

The intertidal zone of Sarangan Beach is characterized by rocky substrates and it has high macroalgae biodiversity. However, based on previous research, limited research was conducted at the location on the changes of macroalgae community structure. This research aims to study the structure and composition of macroalgae communities in the intertidal zone of Sarangan Beach and the physicochemical factors that affect its growth. Data was collected in September 2023, during the maximum low tide. The data collection was done by systematic sampling method using 60 plots 1x1 m2. The physicochemical parameters were measured and observed i.e. water and air temperature, pH, salinity, light intensity, and substrate type. The results showed 23 species of macroalgae were found in the intertidal zone of Sarangan Beach, consisting of 8 species of Chlorophyta, two species of Phaeophyta, and 13 species of Rhodophyta. The highest abundance was shown by Ulva lactuca, followed by Sargassum crassifolium and Kappaphycus alvarezii, while the lowest was Gracilaria spinulosa. The structure of the macroalgae community consists of moderate diversity (H’=1.97) with high uniformity (E=0.63) and low dominance (C=0.27). This is influenced by physicochemical parameters, especially water and air temperature, pH, and substrate condition.

Chemodiversity and bioactivity assessment of phlorotannins from some Phaeophyta species from the Red Sea

AbstractPhlorotannins are a unique and diverse category of secondary polyphenolic metabolites biosynthesized by brown seaweeds. They have revealed a huge potential for food and medicinal applications. In this study, five brown seaweed species were investigated: Polycladia myrica, Sirophysalis trinodis, Dictyota spiralis, Sargassum euryphyllum, and Turbinaria decurrens. All seaweed species contained considerable amounts of phlorotannins with P. myrica recording the highest content (as mg PGEs g−1 DW), followed by S. euryphyllum and then S. trinodis. The presence of phlorotannins was detected using UV–Vis spectroscopy analysis in the characterized range of 280 nm to 300 nm. All species exhibited highly significant antioxidant activity using four different techniques compared to ascorbic acid. For antidiabetic activity, the maximum α-amylase and α-glucosidase activity inhibition were recorded for P. myrica (68.79 ± 0.7%; 66.73 ± 0.5%), followed by T. decurrens (66.38 ± 0.6%; 61.34 ± 0.4%) and then D. spiralis (65.99 ± 0.5%; 60.58 ± 0.4%) compared to the acarbose standard drug (73.76 ± 0.6%; 68.38 ± 0.6%), which nominated these extracts as candidates for antidiabetic drugs. Moreover, the obtained results showed effective anti-inflammatory arthritis effects, with the maximum activity value of 86.02 ± 1.3% recorded for S. euryphyllum, followed by D. spiralis (86.23 ± 1.1%), and then P. myrica (85.94 ± 1.4%). On the other side, a low inhibition percentage of acetyl cholinesterase (AChE) activity was recorded for different phlorotannin extracts, indicating low potentiality as anti-alzheimer materials. Moreover, the P. myrica phlorotannins’ extract showed no toxicity on the WISH normal cell line by using the MTT assay. The same extract comprised a variety of phlorotannins, viz fucophlorethol, fuhalol, and phlorethol compounds, as revealed by UPLC-MS/MS analysis. Graphical Abstract

Diversity and Distribution of Phaeophyta Macroalgae in Pedalen Coastal Waters, Kebumen

Pedalen Beach, Kebumen, has a type of water substrate consists of sand, coral fragments, and coral overgrown with macroalgae. This study aims to determine the species diversity and distribution pattern of Phaeophyta found in that waters. This research is to explore and utilize macroalgae as a sustainable alginate resource. This study uses a survey method, employing the line transect method randomly. The research variables were species diversity and the distribution pattern of Phaeophyta. The main parameters were the number of species and individuals of each species. Supporting parameters include current velocity, nitrate content, brightness, depth, tide, salinity, temperature, and pH. The data were analyzed using the Shannon-Wiener diversity index (H’) to determine the level of species diversity and the Morisita distribution index (Id) to describe the distribution pattern of macroalgae species. We found five Phaeophyta species consisting of Padina australis, Dictyota dichotoma, Turbinaria ornata, Sargassum crassifolium, and S. polycystum. The diversity of Phaeophyta is classified as low diversity index value (H’) with distribution patterns of uniform macroalgae species. The results of the measurement of physical and chemical factors of the waters showed that the condition of the Pedalen Beach waters was quite good for the growth of Phaeophyta.
 
 Keywords: alginate, macroalgae species, Phaeophyta, water substrate

Identification and Abundance of Macroalgae at Batu Layar Coast, West Lombok, Indonesia

Batu Layar coastal area provides an optimum environment for the diversity of coastal biota in the form of corals, crustaceans, molluscs, echinoderms and macroalgae. Macroalgae are plantlike marine biota that are large in size. Based on taxonomy, macroalgae are included in the Thallophyta group because their bodies are thallus. The purpose of this study is to evaluate the abundance of macroalgae in Batu Layar Coastal areas to be used as primary data for further research. This research is located at Batu Layar Coast using the Transect method. The number of transects used is 4 transects with the length of each transect is 50 m. On each transect, 5 stations were taken. Samples of each different macroalgae species at each station were taken for the purpose of morphological identification. Macroalgae identification is presented in the form of descriptive analysis and graphs in the presentation of diversity, evenness, and abundance. The results of the identification of macroalgae in research at Batu Layar Coast as a whole found that there were 24 species of macroalgae consisting of 11 species of Chlorophyta, 8 species of Rhodophyta and 5 species of Phaeophyta. Dominant species on the shoreline are Chlorophyta, in the middle of the transect most of algae are the Phaeophyta and dominant species farthest from the shore are Rhodophyta. The conclusion is the most abundant macroalgae species is Gelidium latifolium from Rhodophyta division with number of abundance is 4.58 individuals/m2.

Proximate Analysis of Selected Macroalgal Species from the Persian Gulf as a Nutritional Resource.

Nowadays the exploration and utilisation of food and feed from marine origin is becoming more important with the increase of human population. Macroalgae are rich in nutritious compounds, which can directly be used in human and animal feed industries. The current study presents the screening of chemical components of eight macroalgae species, Sargassum boveanum, Sirophysalis trinodis, Hypnea caroides, Palisda perforata, Galaxaura rugosa, Caulerpa racemose, Caulerpa sertularioides and Bryopsis corticolans from the Persian Gulf. The results revealed that the eight studied algal species possess high protein (14.46% to 38.20%), lipid (1.27% to 9.13%) and ash (15.50% to 49.14%) contents. The fatty acids and amino acids profile showed the presence of essential fatty acids and amino acids with high nutritional value. Phaeophyta species, S. boveanum and S. trinodis, showed the highest value of ash content and polyunsaturated fatty acids while Chlorophyta species, C. racemose, C. sertularioides and B. corticolans, showed the highest level of lipid and protein contents. Rhodophyta species, G. rugosa and P. perforata, showed the highest essential amino acid content. In conclusion, this study demonstrates the potential of the studied marine species as a nutritional source for human and animal uses.

Habitat Preference of Phaeophyceae Species: Iyengaria stellata (Børgesen) Børgesen (1939) in Gujarat Coast (India)

Abstract Many species of phaeophyta are found at Dwarka and at the Bet-Shankhodhar coast, Gujarat, India. For the study of Iyengaria stellata, the shore platform and reef flat were divided into three sections: Dwarka in i) North, ii) Centre and iii) South sections and Bet-Shankhodhar in i) West, ii) Centre and iii) East sections. I. stellata was monitored based on systematic random sampling for two years (April, 2013 to February, 2015). In the months of December and February, I. stellata was recorded with high frequencies of reef, flat zones and shore platforms. When compared to shore platform, the frequency of I. stallata was highest in coral reef and flat zones. This study supports that reef flat is very suitable for growth of I. stellata. I. stellata’s growth cycle corresponds with local winter season.

Analysis of functional components and radical scavenging activity of 21 algae species collected from the Japanese coast

The functional chemical substances and the antioxidant activity of lipids in 21 marine algae along the Japanese coast were investigated. Principal component analysis was performed to detect any correlation between the chemical substances and algae phylum. Chlorophyta contained a high level of β-carotene. Rhodophyta contained high amounts of cholesterol, β-sitosterol, and saturated fatty acids. Phaeophyta were rich in fucosterol, α-tocopherol, fucoxanthin, and polyphenol. Phaeophyta algae also showed the highest antioxidant activity compared with other phylum. This suggests that Phaeophyta has the greatest potential to be used as a functional food. Consumption of the beneficial Phaeophyta species, such as Eisenia arborea Areschoug and Ecklonia cava Kjellman should be encouraged as not only as food products but also as nutraceuticals and dietary supplements. These beneficial ingredients should be encouraged to be studied in depth with the possibility to develop specific formulated products target to special consumer’s population with added nutritional value.

Community structure and species diversity of intertidal benthic macroalgae in Fengming Island, Dalian

We investigated the community structure, seasonal variation, species diversity, and ecological niche of the intertidal benthic macroalgae community in Fengming Island, Dalian, China. Five sampling sites were established in the study area, and investigations were conducted in July 2010, April and October 2011, and January 2012. Species diversity index, cluster analysis, Levin's index, and Pianka's index were applied to determine species diversity and ecological niche. A total of 74 species were identified, of which, 15 belonged to Chlorophyta, 15 belonged to Phaeophyta, one belonged to Cyanophyta, and 43 belonged to Rhodophyta. The transverse distribution of the macroalgae species varied among the different sampling sites and seasons. In the longitudinal distribution, the low-tide zone had the highest abundance of species, which were predominately Rhodophyta; the mid-tide zone ranked second in the abundance of species, which were predominately Phaeophyta; and the high-tide zone had the lowest abundance of species, which were predominately Chlorophyta. Seasonal species number followed the pattern spring>summer>winter>autumn. Rhodophyta species were the most abundant in all four seasons, followed by Chlorophyta and Phaeophyta species, with Cyanophyta species being the least abundant. The benthic macroalgae in the study area were primarily temperate species, with the warm temperate composition greater than the cold temperate composition. Biomass distribution in each study site showed seasonal variation, and followed the pattern summer>spring>autumn>winter. Species diversity and cluster analysis demonstrated obvious seasonal variations, with the species diversity, evenness, and species richness indices higher in spring and summer than those in autumn and winter. Species diversity also varied among sampling sites. The function and status of different algae in the ecosystem were defined by the niche breadth and overlap results.

ADICIONES A LAS MACROALGAS DE LOS ARRECIFES CORALINOS DE LAS ISLAS DEL ROSARIO, CON NUEVOS REGISTROS PARA EL CARIBE COLOMBIANO Y EL ATLANTICO

Twenty macroalgal species are added to the flora of coral reefs of the Rosario Islands, Colombian Caribbean Sea. Four species of Chlorophyta, three species of Phaeophyta and thirteen of Rhodophyta. Among the mentioned species, the green algae Udotea caribaea Littler et Littler and Batophora oerstedii J. Agardh and the red algae Rhodogorgon ramosissima J. Norris et Bucher, Rhodogorgon carriebowensis J. Norris et Bucher, Hydrolithon borgesenii (Foslie) Foslie and Champia vieillardii Kützing, are reported for the first time for the Colombian Caribbean; and Lithophyllum brachiatum (Heydrich) Lemoine and Antithamnion percurrens Dawson for the Atlantic Ocean. Taxonomic changes are made in some species previously reported for the islands, and the probable place of origin and temporal presence of Sargassum fluitans Borgesen and Turbinaria turbinata (Linné) Kuntze are explained.

Microhabitat Preferences of Phaeophyta on Shore Platform of Dwarka, Gujarat Coast, India

Abstract This paper reports microhabitat preferences of Phaeophyta from the shore platform, Dwarka, Gujarat coast, India. Macroalgae distribution was tagged with shore platform’s zonal morphology. Macroalgae (Phaeophyta) were surveyed based on systematic random sampling for two years (April, 2013 to March, 2015). Total 21 species of Phaeophyta were identified through intensive fieldwork/in situ survey based on Line Intercept Transect and Quadrate based methods. Five groups of Phaeophyta were identified as per their zonal preference on the shore platform. On family level, most of the Sargassaceae showed a ubiquitous distribution on the shore platform while Dictyotaceae showed preference towards the subtidal and intertidal mixed zone of the shore platform.

MACROALGAL ABUNDANCE IN INTERTIDAL ZONE OF SARANGAN BEACH, GUNUNGKIDUL, DIY

<p>Sarangan beach has high biodiversity of macroalgae. Macroalgae has an important role as primary producer for herbivorous marine animals, potentially as biomonitoring, and pollutant bioremediation. As benthic organisms, macroalgae grows attached rocky or reef substrate in intertidal zone. These research aimed to study the macroalgal abundance in Sarangan Beach and influence factors of it. This study is important for local government as a reference to manage and develop the coastal areas of Gunungkidul. Sampling was conducted in 2012-2013 start from determination of the sampling point with line transect then collect data using quadrat plots 100 x 100 cm2 size, seawater nutrient analysis, species identification, and data calculation. The results showed that there were 14 species of Chlorophyta, 4 species of Phaeophyta, and 17 species of Rhodophyta. Enteromorpha intestinalis has a highest abundance, then Ulva fasciata, and Cladophora catenata. Analysis of correlation and regression showed that nutrient levels doesn’t affect the macroalgal abundance in Sarangan Beach. Based on result, the limiting factor of macroalgal abundance in Sarangan Beach is substrate. <br /><strong></strong></p><p><strong>Keywords</strong>: Abundance, Macroalgae, Sarangan Beach, Substrate</p>

Structural characterization and Biological Activity of Sulfolipids from selected Marine Algae

The sulfolipid classes (SLs) in the total lipids of five species of marine algae, two species of Rhodophyta ( Laurencia popillose, Galaxoura cylindriea ), one species of Chlorophyta ( Ulva fasciata ), and two species of Phaeophyta ( Dilophys fasciola, Taonia atomaria ) were separated and purified on DEAE-cellulose column chromatography. The SLs component was identified by IR, gas chromatography MS/MS and liquid chromatography MS/MS. The level of SLs contents va ried from 1.25% (in L. papillose ) to 11.82% (in D. fasciola ) of the total lipid contents. However, no significant differences in sulfate content (0.13 – 0.21%) were observed among all these algae species. All SLs were characterized by high contents of palmitic acid (C 16:0), which ranged from 30.91% in G. cylindriea to 63.11% in T. atomatia . The main constitutes of algal sulfolipids were identified as sulfoquinovosyl-di-acylglycerol and sulfoquinovosyl acylglycerol. The sulfolipids of different algal species exhibited remarkable antiviral activity against herps simplex virus type 1 (HSV -1 ) with an IC50 ranging from 18.75 to 70. 2 μg mL –1 . Moreover, algal sulfolipid inhibited the growth of the tumor cells of breast and liver human cancer cells with IC50 values ranging from 0.40 to 0.67 μg mL –1 for human breast adenocarcinoma cells (MCF7).

The Nutritional Value and Preliminary Risk Assessment of Major and Trace Elements Accumulated in 8 Edible Seaweeds

16 major and trace elements content of 8 edible seaweeds were determined by ICP-AES after wet digestion to compare the nutritional value and pollution level between Cyanophyta (blue), Chlorophyta (green), Rhodophyta (red), Phaeophyta (brown) species. The concentration changes of trace elements in seaweeds had some differences from four species, but the concentration distribution tendency of trace elements was similar. Major elements ( K,Ca,Na,Mg,P) and functional elements (Fe,Mn,Zn,Cu,Se,Cr) were abundant in Cyanophyta (blue) and Phaeophyta (brown) species, these two species, however, accumulated Al selectively. The pollution levels of toxic elements like As, Pb and Hg in most seaweeds from this study demonstrated that the cultivation aquatic eco- environments were relatively safe. In this paper, Nostoc commune var. Flagelliforme (Cyanophyta) abounds in Fe, Zn and major elements, moreover the concentration of potentially toxic elements were relatively low. The second was Phaeophyta species, especially Laminaria japonica Aresch . Porphyra yezoensis Ueda (Rhodophyta) shows the lowest nutritional value.

Valuable compounds in macroalgae extracts

Bioactive compounds present in ethanolic extracts from 18 macroalgae of the Portuguese coast were analysed by gas chromatography–mass spectrometry (GC–MS), leading to the characterization of 14 compounds: proline, phloroglucinol, mannitol, 8 fatty acids and 3 sterols. A dose-dependent response against enzymes with biological significance (α-glucosidase, acetylcholinesterase and butyrylcholinesterase) and free radicals (DPPH, nitric oxide, superoxide and hydroxyl) was found, Phaeophyta being the most promising group. A PCA analysis was performed and allowed the establishment of a correlation between the algae chemical composition and the biological activity. Cystoseira tamariscifolia (Hudson) Papenfuss, Cystoseira nodicaulis (Withering) M. Roberts, Cystoseira usneoides (Linnaeus) M. Roberts and Fucus spiralis Linnaeus are among the most active species, which is in accordance with their higher contents in phloroglucinol, mannitol, oleic, arachidonic and eicosapentaenoic acids, and fucosterol. The results point to the potential interest of the use of Phaeophyta species as food additives, due to their potent antiradical activities, and especially highlights the importance of F. spiralis in the food chain of Mediterranean countries. Moreover, the incorporation of the extracts of these species in food products, nutraceutical and pharmaceutical preparations for human health should also be instigated, since they can suppress hyperglycemia and inhibit cholinesterases.

A new screening for hemagglutinins from Vietnamese marine macroalgae

Aqueous extracts from 42 species of Vietnamese marine macroalgae, including 17 Chlorophyta, 22 Rhodophyta, and three Phaeophyta species, were examined for hemagglutination activity using native and enzyme-treated different animal and human erythrocytes. All extracts agglutinated at least one type of erythrocytes tested. Strong activity was detected in extracts from four Chlorophyta (Caulerpa serulata var. boryana, Caulerpa sertularioides f. longipes, Halimeda velasquezii, and Halimeda discoidea) and two Rhodophyta species (Gelidiella acerosa and Titanophora pulchra) with enzyme-treated rabbit and horse erythrocytes. The hemagglutinins of some active species were examined for sugar-binding specificity, pH, temperature stability, and divalent cation independency using ammonium sulfate precipitates prepared from their extracts. In a hemagglutination–inhibition test with various monosaccharides and glycoproteins, none of the hemagglutinins had affinity for monosaccharides. The activity of the hemagglutinins was inhibited by some glycoproteins tested. The inhibition profiles with glycoproteins were different depending on hemagglutinin species, suggesting the presence of lectins specific for complex N-glycans, high mannose N-glycans or O-glycans. On the other hand, the activities of almost all algal hemagglutinins were stable over a wide range of pH and temperature, and independent of the presence of divalent cations, except Gelidiopsis scoparia hemagglutinin, its activity was dependent on the presence of divalent cations. These results suggest that Vietnamese marine macroalgae may be good sources of useful lectins for many biological applications.

Abstract B78: In vitro cytotoxic and antiproliferative activitiess of marine macroalgae from Yucatan, Mexico

Abstract Extracts from 27 marine algal species (14 Rhodophyta, 5 Phaeophyta and 8 Chlorophyta) from the Yucatan peninsula (Mexico) were evaluated for cytotoxic and anti-roliferative activity by 3[4,5-dimethylthiazole-2-yl]-2,5-diphenyltetrazolium bromide (MTT) and sulforhodamine B (SRB) assays, respectively. In order to determine the specificity of the cytotoxic activity on tumor cells selective index (SI) was also calculated. The following cancer cell lines were employed: normal canine kidney cells (MDCK), human laryngeal carcinoma (Hep-2), human cervix adenocarcinoma (HeLa) and human nasopharynx carcinoma (KB). The results indicated that 44 and 51% of algal species tested showed cytotoxic and anti-roliferative activity, respectively. Most of the cytotoxic extracts were species belong to Chlorophyta, Udotea flabellum and Udotea conglutinate showed the highest cytotoxic activity on all cancer cell lines. For Rhodophyta, the extract of Bryothamnion triquetrum showed an outstanding selective cytotoxicity against Hep-2 cells (CC50 8.29 µg mL−1 with SI=12.04). Two out of five species of Phaeophyta tested (Lobophora variegata and Dictyota caribaea) showed high cytotoxicity activity on KB cell line. The data show that these extracts are potential source of compounds for prevention of certain cancer diseases. Citation Information: Cancer Prev Res 2010;3(1 Suppl):B78.

In vitro cytotoxic and antiproliferative activities of marine macroalgae from Yucatán, Mexico

Extracts from 27 marine algal species (14 Rhodophyta, 5 Phaeophyta, and 8 Chlorophyta) from the Yucatán Peninsula (Mexico) were evaluated for cytotoxic and antiproliferative activity by 3(4,5-dimethylthiazole-2-yl)-2,5 diphenyltetrazolium bromide (MTT) and sulforhodamine B (SRB) assays, respectively. To determine the specificity of cytotoxic activity against tumor cells, the selective index (SI) was also calculated. The following cancer cell lines were employed: normal canine kidney (MDCK) cells, human laryngeal carcinoma (Hep-2) cells, human cervical adenocarcinoma (HeLa) cells, and human nasopharyngeal carcinoma (KB) cells. The results indicated that 44% and 51% of the algal species tested showed cytotoxic and antiproliferative activity, respectively. Most of the cytotoxic extracts were from species of Chlorophyta, with Udotea flabellum and U. conglutinate showing the highest cytotoxic activity against all the cancer cell lines. For Rhodophyta, the Bryothamnion triquetrum extract showed outstanding selective cytotoxicity against Hep-2 cells (CC50 8.29 µg mL–1, SI = 12.04). Two of the five species of Phaeophyta tested (Lobophora variegata and Dictyota caribaea) showed high cytotoxicity activity against the KB cell line. The data show that these species are a potential source of compounds for the treatment of certain cancer diseases.

Biological activities of sulfated polysaccharides from tropical seaweeds

Sulfated polysaccharides from 11 species of tropical marine algae (one edible specie of Rhodophyta, six species of Phaeophyta and four species of Chlorophyta) collected from Natal city coast (Northeast of Brazil) were evaluated for their anticoagulant, antioxidant and antiproliverative in vitro activities. In the activated partial thromboplastin time (APTT) test, which evaluates the intrinsic coagulation pathway, seven seaweeds presented anticoagulant activity. Dictyota cervicornis showed the highest activity, prolonging the coagulation time to double the baseline value in the APTT with only 0.01 mg/100 μl of plasma, 1.4-fold lesser than Clexane ®, a low molecular weight heparin. In the protrombin time (PT) test, which evaluates the extrinsic coagulation pathway, only Caulerpa cupresoides showed anticoagulant activity. All species collected showed antioxidant activities. This screening emphasized the great antioxidant potential (total capacity antioxidant, power reducing and ferrous chelating) of four species: C. sertularioide; Dictyota cervicornis; Sargassum filipendula and Dictyopteris delicatula. After 72 h incubation, HeLa cell proliferation was inhibited ( p < 0.05) between 33.0 and 67.5% by S. filipendula; 31.4 and 65.7% by D. delicatula; 36.3 and 58.4% by Caulerpa prolifera and 40.2 and 61.0% by Dictyota menstrualis at 0.01–2 mg/mL algal polysaccharides. The antiproliferative efficacy of these algal polysaccharides were positively correlated with the sulfate content ( r = 0.934). Several polysaccharides demonstrated promising antioxidant, antiproliferative an/or anticoagulant potential and have been selected for further studies on bioguided fractionation, isolation and characterization of pure polysaccharides from these species as well as in vivo experiments are needed and are already in progress.

Antitrypanosomal in vitro activity of tropical marine algae extracts

Trypanosomiasis is one of the most important parasitic diseases worldwide. The undesirable side effects and low efficacy of classical trypanocidal drugs underline the necessity of the development of new drugs from natural products. Although marine algae have been recognized as attractive sources of known and novel bioactive compounds, very little research has been focused on antiprotozoal activity. Aqueous and organic extracts of 29 species of marine algae (14 species of Rhodophyta, seven species of Phaeophyta, and eight species of Chlorophyta) collected from the Gulf of Mexico and Caribbean coast of the Yucatan Peninsula (Mexico) were evaluated for their antiprotozoal activity in vitro against Trypanosoma cruzi trypomastigotes. The toxicity of these extracts was evaluated using brine shrimp (Artemia salina). The cytotoxicity on mammalian cells was also assessed by the MTT viability assay. The organic extracts from Dictyota caribea Horning & Schnetter, Lobophora variegata (J.V. Lamouroux) Womersley, Turbinaria turbinata Linnaeus, and Laurencia microcladia Kützing possess promising in vitro activity against T. cruzi trypomastigotes. The toxicity displayed by Laurencia microcladia against Artemia salina and the high cytotoxicity exhibited by T. turbinata must be taken into account in further studies.

Antioxidant and antitumoural activities of some Phaeophyta from Brittany coasts

In this study, the antioxidant activity exhibited by crude extracts from 10 Phaeophyta species from Brittany coasts was assessed by three methods (DPPH, reducing activity and b-carotene–linoleic acid system), and their phenolic contents were examined. Antitumoural activities were determined by a cytotoxic assay with three different tumoural cells lines (Daudi, Jurkat and K562). Among the species under study, four Fucales, i.e. Bifurcaria bifurcata, Cystoseira tamariscifolia, Fucus ceranoides and Halidrys siliquosa, displayed a high antioxidant activity. Further to the fractionation of these crude extracts, a significant correlation was found in most fractions between the high antioxidant activity and the high phenolic content. Five species, i.e. B. bifurcata, C. tamariscifolia, Desmarestia ligulata, Dictyota dichotoma and H. siliquosa, exhibited strong cytotoxic activities against all tumoural cells.