| evaluation of the contamination of marine algae (seaweed) from the st. lawrence river and likely to be consumed by humans. | the goal of the study was to assess the contamination of marine algae (seaweeds) growing in the st. lawrence river estuary and gulf of st. lawrence and to evaluate the risks to human health from the consumption of these algae. algae were collected by hand at low tide. a total of 10 sites on the north and south shores of the st. lawrence as well as in baie des chaleurs were sampled. the most frequently collected species of algae were fucus vesiculosus, ascophyllum nodosum, laminaria longicruris, ... | 1999 | 10092431 |
| improvement of the digestibility of the proteins of the red alga palmaria palmata by physical processes and fermentation. | palmaria palmata (dulse) is an edible red alga constituting a potential protein source in human diet. however, previous studies showed that the digestibility of dulse proteins is bad because of the cell-wall encapsulating cytoplasmic proteins and the presence of fibers. the water-soluble xylan, present in high proportions in dulse, could be involved to explain the weak digestibility of proteins. to limit the influence of fibers and to improve the nutritional quality of these proteins, we have tr ... | 2003 | 14609091 |
| one-step purification of r-phycoerythrin from the red macroalga palmaria palmata using preparative polyacrylamide gel electrophoresis. | phycoerythrin is a major light-harvesting pigment of red algae and cyanobacteria widely used as a fluorescent probe. in this study, phycoerythrin of the red macroalga palmaria palmata was extracted by grinding the algal sample in liquid nitrogen, homogenisation in phosphate buffer and centrifugation. phycoerythrin was then purified from this crude extract using preparative polyacrylamide gel electrophoresis (page) with a continuous elution system and detected by its pink colour and fluorescence. ... | 2000 | 10744320 |
| non-starch polysaccharides extracted from seaweed can modulate intestinal absorption of glucose and insulin response in the pig. | we have investigated the possible effects of algal polysaccharides on postprandial blood glucose and insulin responses in an animal model, the pig. three seaweed fibres of different viscosities, extracted from palmaria palmata (pp), eucheuma cottonii (ec), or laminaria digitata (ld), were compared to purified cellulose (cel). blood glucose and plasma insulin levels were monitored and intestinal absorption quantified for 8 h following a high carbohydrate test-meal supplemented with 5% fibre. dige ... | 2000 | 10737549 |
| utilization of algal polysaccharides by human colonic bacteria, in axenic culture or in association with hydrogenotrophic microorganisms. | the ability of different hydrolytic bacteria from the human colon to grow on various algal polymers (carrageenans, palmaria palmata xylan, ulvan, desulphated ulvan and laminaran) was investigated and the interactions between bacteroides thetaiotaomicron and h2-utilizing microorganisms (one methanogenic archaea and an acetogenic bacterium) were studied during laminaran degradation. none of the algal polysaccharides supported the growth of any of the hydrolytic species tested, except for laminaran ... | 1997 | 9178362 |
| confirmation by gas chromatography/mass spectrometry of two unusual trans-3-monoethylenic fatty acids from the nova scotian seaweeds palmaria palmata and chondrus crispus. | the structures of two unusual fatty acids, the known trans-3-hexadecenoic acid and a novel trans-3-tetradecenoic acid, both isolated from the nova scotian seaweeds palmaria palmata and chondrus crispus, were positively identified. after the extraction of the total fatty acids by saponification, followed by methylation, the monoenoic trans fractions were isolated by thin-layer chromatography on silica gel impregnated with silver nitrate. the monoenoic trans fractions were derivatized with 2-amino ... | 1994 | 8090067 |
| inhibition of collagenase by mycosporine-like amino acids from marine sources. | matrix metalloproteinases play an important role in extracellular matrix remodeling. excessive activity of these enzymes can be induced by uv light and leads to skin damage, a process known as photoaging. in this study, we investigated the collagenase inhibition potential of mycosporine-like amino acids, compounds that have been isolated from marine organisms and are known photoprotectants against uv-a and uv-b. for this purpose, the commonly used collagenase assay was optimized and for the firs ... | 2015 | 26039265 |
| ultraviolet-b-induced cyclobutane-pyrimidine dimer formation and repair in arctic marine macrophytes. | the significance of ultraviolet-b radiation (uvbr: 280-315 nm)-induced dna damage as a stress factor for arctic marine macrophytes was examined in the kongsfjord (spitsbergen, 78 degrees 55.5'n, 11 degrees 56.0'e) in summer. uvbr penetration in the water column was monitored as accumulation of cyclobutane-pyrimidine dimers (cpd) in bare dna. this showed that uvbr transparency of the fjord was variable, with 1% depths ranging between 4 and 8 m. in addition, induction and repair kinetics of cpd we ... | 2002 | 12462643 |
| extracts of north sea macroalgae reveal specific activity patterns against attachment and proliferation of benthic diatoms: a laboratory study. | a variety of macroalgae (ceramium rubrum, corallina officinalis, palmaria palmata, mastocarpus stellatus, fucus vesiculosus, cladophora rupestris, ulva sp.) were investigated by scanning electron microscopy to visualize epiphytic colonizers. the macroalgae differed in terms of their epiphytic coverage of bacteria, fungi and diatoms. macroalgae, largely devoid of epiphytic diatoms, were hypothesized to employ effective antifouling means to reduce epiphytic coverage, whilst heavily fouled macroalg ... | 2008 | 18092216 |
| polyunsaturated fatty acids in various macroalgal species from north atlantic and tropical seas. | in this study the efficacy of using marine macroalgae as a source for polyunsaturated fatty acids, which are associated with the prevention of inflammation, cardiovascular diseases and mental disorders, was investigated. | 2011 | 21696609 |
| the anti-inflammatory effect of algae-derived lipid extracts on lipopolysaccharide (lps)-stimulated human thp-1 macrophages. | algae contain a number of anti-inflammatory bioactive compounds such as omega-3 polyunsaturated fatty acids (n-3 pufa) and chlorophyll a, hence as dietary ingredients, their extracts may be effective in chronic inflammation-linked metabolic diseases such as cardiovascular disease. in this study, anti-inflammatory potential of lipid extracts from three red seaweeds (porphyra dioica, palmaria palmata and chondrus crispus) and one microalga (pavlova lutheri) were assessed in lipopolysaccharide (lps ... | 2015 | 26308008 |
| antiproliferative and antioxidant activities and mycosporine-like amino acid profiles of wild-harvested and cultivated edible canadian marine red macroalgae. | antiproliferative and antioxidant activities and mycosporine-like amino acid (maa) profiles of methanol extracts from edible wild-harvested (chondrus crispus, mastocarpus stellatus, palmaria palmata) and cultivated (c. crispus) marine red macroalgae were studied herein. palythine, asterina-330, shinorine, palythinol, porphyra-334 and usujirene maas were identified in the macroalgal extracts by lc/ms/ms. extract reducing activity rankings were (p < 0.001): wild p. palmata > cultivated c. crispus ... | 2016 | 26805798 |
| essential and toxic elements in seaweeds for human consumption. | essential elements (k, ca, p, s, cl, mn, fe, cu, zn, ni, br, and i) and nonessential or toxic elements (al, ti, si, rb, sr, as, cd, sn, and pb) were determined by energy-dispersive polarized x-ray fluorescence spectrometry in 14 seaweeds purchased in local specialty stores in italy and consumed by humans. the differences in elements between the algae species reached up to 2-4 orders of magnitude. lithothamnium calcareum showed the highest levels of ca, al, si, fe, and ti. palmaria palmata showed ... | 2016 | 26817952 |
| comparative study of chromium biosorption by red, green and brown seaweed biomass. | dried biomass of the macroalgae fucus vesiculosus and fucus spiralis (brown), ulva spp. (comprising ulva linza, ulva compressa and ulva intestinalis) and ulva lactuca (green), palmaria palmata and polysiphonia lanosa (red) were studied in terms of their chromium biosorption performance. metal sorption was highly ph dependent with maximum cr(iii) and cr(vi) sorption occurring at ph 4.5 and ph 2, respectively. extended equilibrium times were required for cr(vi) binding over cr(iii) binding (180 an ... | 2008 | 17884133 |
| marine macroalgae as a source for osmoprotection for escherichia coli. | at elevated osmolarity of the mineral medium m63, marine macroalgae constitute important osmoprotectants and nutrients sources for escherichia coli. growth of bacterial population (16 strains) was improved by supplementing m63 salts medium with either aqueous or ethanolic algal extracts obtained from ascophyllum nodosum, fucus serratus, enteromorpha ramulosa, ulva lactuca, and palmaria palmata. in their presence, growth was still observed even at 1.02 m nacl. furthermore, the e. coli zb400 growt ... | 1995 | 24185483 |
| efficient production of succinic acid from palmaria palmata hydrolysate by metabolically engineered escherichia coli. | succinic acid, a c4 dicarboxylic acid is used in many fields such as food, agriculture, pharmaceutical and polymer industries. in this study, microbial production of succinic acid from palmaria palmata was investigated for the first time. in engineered escherichia coli klppp, lactate dehydrogenase, pyruvate formate lyase, phosphotransacetylase-acetate kinase and pyruvate oxidase genes were deleted while phosphoenolpyruvate carboxykinase was overexpressed. the recombinant exhibited higher molar y ... | 2016 | 27203224 |
| evaluation of an in vitro method to estimate trace elements bioavailability in edible seaweeds. | raw edible seaweed harvested in the galician coast (northwestern spain), including two red seaweed types (dulse and nori), three brown seaweed (kombu, wakame and sea spaghetti), one green seaweed (sea lettuce) and one microalgae (spirulina platensis) were studied to assess trace elements bioavailability using an in vitro method (simulated gastric and intestinal digestion/dialysis). similarly, a cooked seaweed sample (canned in brine) consisting of a mixture of two brown seaweed (sea spaghetti an ... | 2010 | 20875561 |
| strains of uronema marinum (scuticociliatia) co-isolated with amoebae of the genus neoparamoeba. | mixed infections of histophagous ciliates and neoparamoeba spp. page, 1987 were diagnosed in gill tissue of farmed turbot psetta maxima (synonym: scophthalmus maximus) and atlantic salmon salmo salar during a study of amoebic gill disease. ciliates co-isolated from lesions grossly visible on gills of both fish hosts and from 2 species of red algae lithophyllum racemus and palmaria palmata were characterized morphologically and by using molecular markers. sequences of small subunit (ssu) rdna wer ... | 2010 | 20391914 |
| antioxidant and antiproliferative activities of extracts from a variety of edible seaweeds. | dietary laminaria and porphyra sp. have been reported to reduce the risk of intestinal or mammary cancer in animal studies. algal anticarcinogenicity may involve effects on cell proliferation and antioxidant activity. thus, in the present study, we evaluated the effect of red alga, dulse (palmaria palmata) and three kelp (laminaria setchellii, macrocystis integrifolia, nereocystis leutkeana) extracts on human cervical adenocarcinoma cell line (hela cells) proliferation using the mtt (3-(4,5-dime ... | 2006 | 16554116 |
| cu(ii) binding by dried biomass of red, green and brown macroalgae. | dried biomass of the marine macroalgae fucus spiralis and fucus vesiculosus (brown), ulva spp. (comprising ulva linza, ulva compressa and ulva intestinalis) and ulva lactuca (green), palmaria palmata and polysiphonia lanosa (red) were studied in terms of their cu(ii) biosorption performance. this is the first study of its kind to compare cu(ii) uptake by these seaweeds in the south-east of ireland. potentiometric and conductimetric titrations revealed a variety of functionalities on the seaweed ... | 2007 | 17234234 |
| the effect of ultraviolet radiation on ultrastructure and photosynthesis in the red macroalgae palmaria palmata and odonthalia dentata from arctic waters. | in radiation exposure experiments, the effects of mild artificial uv conditions (4.7 w m(-2) uv-a and 0.20 w m(-2) uv-b) plus par (25 - 30 micromol photons m(-2) s(-1)) on photosynthesis and ultrastructure of two red algal species from the arctic have been investigated. while palmaria palmata was collected from the upper sublittoral of the kongsfjord (spitsbergen, norway), odonthalia dentata represents a typical deepwater species at this high latitude. after 6 h and 24 h exposure to uv, chloroph ... | 2004 | 15375728 |
| surface attachment induced production of antimicrobial compounds by marine epiphytic bacteria using modified roller bottle cultivation. | a modified roller bottle culture method elicited the production of antimicrobial compounds from 2 epibiotic marine bacterial strains, ei-34-6 and ii-111-5, isolated from the surface of the marine alga palmaria palmata. these isolates, tentatively identified as bacillus species, were grown as a biofilm on the surface of nutrient glycerol ferric agar (ngfa) and marine columbia glycerol agar (mcga) on the inside of a rolling bottle. the biofilm was shown to be stable, and the cells were difficult t ... | 2002 | 14961247 |
| quantitative analysis of mycosporine-like amino acids in marine algae by capillary electrophoresis with diode-array detection. | marine species have evolved a variety of physical or chemical strategies to diminish damage from elevated environmental ultraviolet radiation. mycosporine-like amino acids, a group of widely distributed small water soluble compounds, are biologically relevant because of their photo-protective potential. in addition, presumed antioxidant and skin protective strategies raise the interest for possible medicinal and cosmetic applications. in this study the first ce method for the quantification of m ... | 2017 | 28213175 |
| characterization of protein, lipid and mineral contents in common norwegian seaweeds and evaluation of their potential as food and feed. | the objectives of this study were to examine protein and amino acid composition, lipid and fatty acid composition, along with a range of essential minerals in common norwegian seaweed species representing the red (palmaria palmata and vertebrata lanosa), green (cladophora rupestris, enteromorpha intestinalis and ulva lactuca) and brown (alaria esculenta, laminaria digitata, laminaria hyperborea, fucus vesiculosus and pelvetia canaliculata) classes and assess their potential as alternatives to ce ... | 2014 | 24700148 |
| selection of yeast strains for bioethanol production from uk seaweeds. | macroalgae (seaweeds) are a promising feedstock for the production of third generation bioethanol, since they have high carbohydrate contents, contain little or no lignin and are available in abundance. however, seaweeds typically contain a more diverse array of monomeric sugars than are commonly present in feedstocks derived from lignocellulosic material which are currently used for bioethanol production. hence, identification of a suitable fermentative microorganism that can utilise the princi ... | 2017 | 27057090 |
| nutritional value of proteins from edible seaweed palmaria palmata (dulse). | palmaria palmata (dulse) is a red seaweed that may be a potential protein source in the human diet. its protein content, amino acid composition, and protein digestibility were studied with algae collected every month over a 1-year period. significant variations in protein content were observed according to the season: the highest protein content (21.9 +/- 3.5%) was found in the winter-spring period and the lowest (11.9 +/- 2.0%) in the summer-early autumn period. most of the essential amino acid ... | 1999 | 15539310 |
| purification and identification of dipeptidyl peptidase (dpp) iv inhibitory peptides from the macroalga palmaria palmata. | dipeptidyl peptidase (dpp)-iv inhibitory peptides were purified and identified from an aqueous palmaria palmata protein extract hydrolysed with corolase pp. the hydrolysate was fractionated by solid phase extraction (spe) using a c18 matrix followed by semi-preparative reverse phase-high performance liquid chromatography (sp rp-hplc). ic50 values of 1.47 ± 0.09, 0.54 ± 0.03 and 0.36 ± 0.03 mg/ml were obtained for the hydrolysate, the 25%--acetonitrile (acn) spe fraction and the most active sp rp ... | 2015 | 25442570 |
| influence of extractive solvents on lipid and fatty acids content of edible freshwater algal and seaweed products, the green microalga chlorella kessleri and the cyanobacterium spirulina platensis. | total lipid contents of green (chlorella pyrenoidosa, c), red (porphyra tenera, n; palmaria palmata, d), and brown (laminaria japonica, k; eisenia bicyclis, a; undaria pinnatifida, w, wi; hizikia fusiformis, h) commercial edible algal and cyanobacterial (spirulina platensis, s) products, and autotrophically cultivated samples of the green microalga chlorella kessleri (ck) and the cyanobacterium spirulina platensis (sp) were determined using a solvent mixture of methanol/chloroform/water (1:2:1, ... | 2014 | 24566307 |