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Marie Jazzara, Ahmed Ghannam, Chadi Soukkarieh, Hossam Murad
BACKGROUND: Sulfated Polysaccharides (SPs) possess spectrum of pharmacological and therapeutic properties that could attributed to their origins variation, chemical structures and biological activities. Various studies have shown the impact of SPs on proliferation in different cancer cell lines. OBJECTIVES: In this study, we have evaluated the biological effects of λ-carrageenan, a highly SP, extracted from the red seaweed Laurencia papillosa, on MDA-MB-231 cancer cell line...
August 2016: Iranian Journal of Cancer Prevention
Tao Song, Hui Xu, Congchong Wei, Tengfei Jiang, Shishang Qin, Weijia Zhang, Yu Cao, Chao Hu, Fan Zhang, Dairong Qiao, Yi Cao
Seaweed is receiving an increasing amount of attention as a "sea vegetable". The microbiota of coastal populations may acquire seaweed associated enzymes through marine food. Several agarases have been found in non-marine environments; however, their origin is unknown. In this study, a hypothetical protein, Aga1, was identified as an agarase from an inland soil agar-degrading bacterium, Paenibacillus sp. SSG-1.Having low similarity to known glycoside hydrolases, Aga1 may be a distant member of the glycoside hydrolase family 86...
October 19, 2016: Scientific Reports
Ditte B Hermund, Ayse Karadag, Ulf Andersen, Rósa Jónsdóttir, Hordur G Kristinsson, Cesarettin Alasalvar, Charlotte Jacobsen
Fucus vesiculosus extracts that have both radical scavenging activity and metal chelating ability in vitro were used as natural antioxidant in granola bars enriched with fish oil emulsion either by using primary and secondary emulsion systems stabilized by sodium caseinate alone and sodium caseinate-chitosan. The bars were stored at 20°C and evaluated over a period of 10 weeks by measuring the development of primary and secondary oxidation products. The samples prepared with secondary emulsion system developed less oxidation products probably due to increased interfacial layer thickness that would act a barrier to the penetration and diffusion of molecular species that promote oxidation...
October 14, 2016: Journal of Agricultural and Food Chemistry
Boris A López, Erasmo C Macaya, Fadia Tala, Florence Tellier, Martin Thiel
Dispersal on floating seaweeds depends on availability, viability and trajectories of the rafts. In the southern hemisphere, the bull kelp Durvillaea antarctica is one of the most common floating seaweeds, but phylogeographic studies had shown low connectivity between populations from continental Chile, which could be due to limitations in local supply and dispersal of floating kelps. To test this hypothesis, the spatiotemporal dynamics of kelp strandings were examined in four biogeographic districts along the Chilean coast (28°-42°S)...
October 13, 2016: Journal of Phycology
Yuqi Li, Hui Zhang, Mizi Fan, Jiandong Zhuang, Lihui Chen
Oil-water separation has recently become an important subject due to the increasing incidence of oil spills. Materials with underwater superoleophobic properties have aroused considerable interest due to their cost-effectiveness, environmental friendliness and anti-fouling properties. This paper presents a robust salt-tolerant superoleophobic aerogel inspired by seaweed used without any further chemical modification for oil-seawater separation. The green aerogel is prepared by freeze-drying of sodium alginate (SA)-nanofibrillated cellulose (NFC) using Ca(2+) ions as the crosslinking agent...
September 14, 2016: Physical Chemistry Chemical Physics: PCCP
Yuvaraj Neelakandan, Arul Venkatesan
AIM: The aim of this objective is to evaluate the antinociceptive and anti-inflammatory potential of sulfated polysaccharide purified fractions isolated from brown seaweed Sargassum wightii and seagrass Halophila ovalis in male Wistar rats. SUBJECTS AND METHODS: Crude sulfated polysaccharide from S. wightii and H. ovalis was subjected to anion exchange chromatography, and the chemical composition was investigated. The antinociceptive activity of purified fractions was investigated using formalin and hot plate test...
September 2016: Indian Journal of Pharmacology
Susete Pinteus, Joana Silva, Celso Alves, André Horta, Nádia Fino, Ana Inês Rodrigues, Susana Mendes, Rui Pedrosa
Screening of antioxidant potential of dichloromethane and methanolic extracts of twenty-seven seaweeds from the Peniche coast was performed by: total phenolic contents (TPC), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity and oxygen radical absorbance capacity (ORAC). Seaweeds revealing the highest antioxidant activity were screened for cytoprotective potential in MCF-7 cells, including the mitochondrial membrane potential analysis and the caspase-9 activity. High correlation was found between TPC of seaweed extracts and their scavenging capacity on DPPH and peroxyl radicals...
March 1, 2017: Food Chemistry
Kajal Chakraborty, Bini Thilakan, Vamshi Krishna Raola, Minju Joy
Heterotrophic Bacillus amyloliquefaciens associated with edible red seaweed, Laurenciae papillosa was used to isolate antibacterial polyketide compounds. Antibacterial activity studies integrated with the outcome obtained by polyketide synthetase (pks) coding genes established that seaweed-affiliated bacterial flora had a wide-ranging antibacterial activities and potential natural product diversity, which proved that the bacterium is valuable reservoir of novel bioactive metabolites. Bioactivity-guided isolation of 3-(octahydro-9-isopropyl-2H-benzo[h]chromen-4-yl)-2-methylpropyl benzoate and methyl 8-(2-(benzoyloxy)-ethyl)-hexahydro-4-((E)-pent-2-enyl)-2H-chromene-6-carboxylate of polyketide origin, with activity against human opportunistic food pathogenic microbes, have been isolated from the ethyl acetate extract of B...
March 1, 2017: Food Chemistry
Bernabé Santelices, Alejandra V González, Jessica Beltrán, Verónica Flores
Chimerism is produced by the somatic fusion of two or more genetically distinct conspecific individuals. In animals, the main cost of fusion is competition between genetically different cell lineages and the probability of original cell-line replacement by more competitive invasive lines, which limits its natural frequency (3-5%). In red and brown seaweeds, chimerism is widespread (27-53%), seemingly without the negative outcomes described for animals. The rigidity of cell walls in macroalgae prevents cell motility and invasions...
October 7, 2016: Journal of Phycology
Henda Ferchichi, Sarra Bacha, Nadia Kourda, Salma Melaouhia, Emna Gaies, Mohamed Lakhal, Anis Klouz, S Trabelsi, Issam Salouage
Introduction In recent years, many marine resources have drew attention in the research for bio-active compounds to develop new drugs and health foods. (1) Marine algae are now considered as a rich source of antioxidants (2). It is known that seaweeds contain numerous bioactive substances that have the ability to lower cholesterol, reduce blood pressure, promote healthy digestion; and antioxidant activity (3). Natural antioxidants are interesting compounds due to their properties which help prevent oxidative stress (4), among other potentially beneficial actions...
April 2016: La Tunisie Médicale
Palaniappan Seedevi, Meivelu Moovendhan, Shanmugam Viramani, Annian Shanmugam
The Sulfated polysaccharide was purified through anion-exchange and gel permeation column chromatography. The isolated sulfated polysaccharide from C. corticata contains 84% of carbohydrate, 0% of protein, 19.7% of ash and 29.4% of moisture was found. The carbon, hydrogen, nitrogen and sulfur content as 33.19%, 5.91%, 7.21% and 3.75%. The molecular weight of sulfated polysaccharide was found to be 43kDa. The sugar was composed of (90.11%), glucose (5.47%), xylose (2.30%) and mannose (2.12%). The structural feature of sulfated polysachharide was studied through FT-IR and (1)H NMR spectral analysis...
January 2, 2017: Carbohydrate Polymers
Jayanta Kumar Patra, Kwang-Hyun Baek
BACKGROUND: Listeria monocytogenes is one of the most virulent types of bacteria and causes severe foodborne illness, such as listeriosis. Because this pathogen has become resistant to sanitizers and other disinfectants that are used to clean utensils and surfaces during food processing, it poses a serious threat to the food industry. OBJECTIVES: The study was conducted to determine the anti-listerial potential of essential oils extracted from four edible seaweeds against L...
July 2016: Jundishapur Journal of Microbiology
Chizuko Maruyama, Rena Nakano, Mitsuha Shima, Asumi Mae, Yuri Shijo, Eri Nakamura, Yuuna Okabe, Sunmi Park, Noriko Kameyama, Satomi Hirai, Mamoru Nakanishi, Kagehiro Uchida, Hiroshi Nishiyama
AIM: We conducted a pilot study to clarify the effects of the Japan Diet nutritional education program on metabolic risk factors for atherosclerotic cardiovascular disease in middle-aged men who were brought up in the westernized dietary environment of modern Japan. METHODS: Thirty-three men, 30-49 years of age, attended a nutrition education class to learn food items and recommended volumes comprising the Japan Diet (more fish, soybeans and soy products, vegetables, seaweed, mushrooms and unrefined cereals, and less animal fat, meat and poultry with fat, sweets, desserts and snacks, and alcoholic drinks), and were encouraged to consume the Japan Diet for 6 weeks...
September 21, 2016: Journal of Atherosclerosis and Thrombosis
Shin Young Park, Sujin Kang, Sang-Do Ha
In Korea, edible seaweeds are potentially regarded as high-risk foods with respect to enteric norovirus (NoV) and non-pathogenic generic Escherichia coli. This study investigated the antimicrobial effects of 5%, 10%, and 15% vinegar (6% acetic acid) on the survival of murine norovirus-1 (MNV-1), a human NoV surrogate, and E. coli, a fecal indicator in experimentally contaminated raw fresh green lavers (Enteromorpha intestinalis) during a 7-d storage period at 4°C. Both MNV-1 titers and E. coli counts significantly (p<0...
September 5, 2016: International Journal of Food Microbiology
Afsaneh Yegdaneh, Alireza Ghannadi, Ladan Dayani
The marine environment represents approximately half of the global biodiversity and could provide unlimited biological resources for the production of therapeutic drugs. Marine seaweeds comprise few thousands of species representing a considerable part of the littoral biomass. Extracts of the Cystoseira indica and Cystoseira merica were subjected to phytochemical and cytotoxicity evaluation. The amount of total phenol was determined with Folin-Ciocalteu reagent. Cytotoxicity was characterized by IC50 of human cancer cell lines including MCF-7 (human breast adenocarcinoma), HeLa (cervical carcinoma), and HT-29 (human colon adenocarcinoma) using Sulforhodamin assay...
July 2016: Research in Pharmaceutical Sciences
Hisashi Yagi, Asako Fujise, Narumi Itabashi, Takashi Ohshiro
The application of marine resources, instead of fossil fuels, for biomass production is important for building a sustainable society. Seaweed is valuable as a source of marine biomass for producing biofuels such as ethanol, and can be used in various fields. Alginate is an anionic polysaccharide that forms the main component of brown algae. Various alginate lyases (e.g. exo- and endo-types and oligoalginate lyase) are generally used to degrade alginate. We herein describe a novel alginate lyase, AlgC-PL7, which belongs to the polysaccharide lyase 7 family...
December 2016: Bioscience, Biotechnology, and Biochemistry
Sayo Horibe, Toshihito Tanahashi, Shoji Kawauchi, Shigeto Mizuno, Yoshiyuki Rikitake
Recent advances in diagnostic technologies have revealed that nonsteroidal anti-inflammatory drugs (NSAIDs) can cause serious mucosal injury in the upper and lower gastrointestinal tract (including the small intestine). A drug to treat NSAID-induced small-intestinal injury (SII) is lacking. Sodium alginate is a soluble dietary fiber extracted from brown seaweed and its solution has been used as a hemostatic agent to treat gastrointestinal bleeding due to gastric ulcers. Whether sodium alginate has therapeutic effects on NSAID-induced SII and its mechanism of action are not known...
2016: International Journal of Medical Sciences
Jessica J Holden, Sarah E Dudas, Francis Juanes
No abstract text is available yet for this article.
October 2016: Integrated Environmental Assessment and Management
Maxine Swee-Li Yee, Poi-Sim Khiew, Wee Siong Chiu, Yuen Fen Tan, Yih-Yih Kok, Chee-Onn Leong
Fouling of marine surfaces has been a perpetual problem ever since the days of the early sailors. The tenacious attachment of seaweed and invertebrates to man-made surfaces, notably on ship hulls, has incurred undesirable economic losses. Graphene receives great attention in the materials world for its unique combination of physical and chemical properties. Herein, we present a novel 2-step synthesis method of graphene-silver nanocomposites which bypasses the formation of graphene oxide (GO), and produces silver nanoparticles supported on graphene sheets through a mild hydrothermal reduction process...
September 9, 2016: Colloids and Surfaces. B, Biointerfaces
Thi Thu Thuy Thanh, Thi Minh Thu Quach, Thi Nu Nguyen, Dang Vu Luong, Minh Ly Bui, Thi Thanh Van Tran
The structure of an ulvan obtained by water extraction from green seaweed Ulva lactuca was elucidated by using IR, NMR, SEC-MALL and ESIMS methods. The ulvan was also evaluated for its cytotoxic effects on three human cancer cell lines. The results showed that the ulvan was composed of rhamnose, galactose, xylose, manose, glucose (with a mole ratio of Rha: Gal: Xyl: Man: Glu equal to 1: 0.03: 0.07: 0.01: 0.06), uronic acid (21.5%) and sulfate content (18.9%) with a molecular weight of 347000. This ulvan mainly consists of disaccharide [→4)-β-d-GlcA-(1→4)-α-l-Rha3S-(1→] and other minor disaccharide β-GlcA-(1→2)-α-Xyl and β-GlcA-(→2)-α-Rha...
September 13, 2016: International Journal of Biological Macromolecules
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