Topic
Fucus vesiculosus
About: Fucus vesiculosus is a research topic. Over the lifetime, 906 publications have been published within this topic receiving 31613 citations. The topic is also known as: Bladder wrack.
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TL;DR: The different options for thermal conversion and behaviour under combustion and pyrolysis have been evaluated and compared to several types of terrestrial biomass including Miscanthus, short rotation Willow coppice and Oat straw.
591 citations
TL;DR: Mineral content was determined in several brown and red edible marine sea vegetables and red seaweeds and indicated that marine seaweeds contained higher amounts of both macrominerals and trace elements than reported for edible land plants.
563 citations
TL;DR: This fraction showed the highest potential to be antioxidant by the ferric reducing antioxidant power (FRAP) assay, followed by the alkali- and water-soluble fractions, and potentially could be used as natural antioxidants by the food industry.
Abstract: Fucus vesiculosus was sequentially extracted with water at 22 degrees C (fraction 1 (F1)) and 60 degrees C (F2), and with 0.1 M HCl (F3) and 2 M KOH (F4) at 37 degrees C. Soluble fractions (42.3% yield) were composed of neutral sugars (18.9-48 g/100 g), uronic acids (8.8-52.8 g/100 g), sulfate (2.4-11.5 g/100 g), small amounts of protein (< 1-6.1 g/100 g), and nondialyzable polyphenols (0.1-2.7 g/100 g). The main neutral sugars were fucose, glucose, galactose, and xylose. Infrared (IR) spectra of the fractions showed absorption bands at 820-850 and 1225-1250 cm(-1) for sulfate. F1, F2, and F4 also exhibited an absorption band at 1425 cm(-1), due to uronic acids, and their IR spectra resembled that of alginate. F3 had an IR spectrum similar to that of fucoidan with an average molecular weight of 1.6 x 10(6) Da, calculated by molecular exclusion high-performance liquid chromatography. The presence of fucose in this polysaccharide was confirmed by (1)H NMR spectroscopy. This fraction showed the highest potential to be antioxidant by the ferric reducing antioxidant power (FRAP) assay, followed by the alkali- and water-soluble fractions. Sulfated polysaccharides from edible seaweeds potentially could be used as natural antioxidants by the food industry.
559 citations
TL;DR: The structural characteristics of polysaccharides extracted from Quebec's seaweed have not been fully established to date and characterization will lead to a better understanding of their functional characteristics and promote the exploitation of this natural resource.
471 citations
TL;DR: The results suggest that the species-specific differences in growth rate and critical N concentrations account for a substantial part of the variation in the duration of nutrient limitation among different algal types and provide further clarification of the reasons why fast-growing algae are stimulated by increased nutrient availability while slowgrowing algae remain unaffected or are hampered due to shading.
Abstract: Nutrient enrichment of shallow coastal waters changes the composition of plant communities so that slow-growing, benthic macrophytes are replaced by fast-growing algae such as phytoplankton and ephemeral macroalgae. This scenario suggests that fast-growing algae suffer more from nutrient limitation than slow-growing algae at low nutrient availability. We tested this hypothesis by comparing the effect of in situ nutrient enrichment on the phytoplankton community, 4 ephemeral macroalgae (Ulva lactuca, Cladophora serica, Chaetomorpha linum and Ceramiurn rubrum) and 1 perennial macroalga (Fucus vesiculosus). Nitrogen was the main limiting nutrient to algal growth and fast-growing algae were N limited for a longer period during summer than slower-growing species. Differences in the temporal extent of N limitation were related to species-specific variations in N requirements for growth and in N storage pools. The N requirements per unit biomass and time were up to 30-fold higher for fast-growing algae compared to slow-growing species due to 10-fold faster growth and 3-fold higher demands for the internal N concentration needed to sustain maximum growth (i.e. critical concentrations). The pools of N reserves only varied 2-fold among algal species and could support maximum growth for 0.5 d in the phytoplankton community and for 12 d in E vesiculosus. Growth of phytoplankton and E vesiculosus could proceed at reduced rates for another 2.6 and 34 d. respectively, based on other internal pools of N. The results suggest that the species-specific differences in growth rate and critical N concentrations account for a substantial part of the variation in the duration of nutrient limitation among different algal types and, therefore, provide further clarification of the reasons why fast-growing algae are stimulated by increased nutrient availability while slowgrowing algae remain unaffected or are hampered due to shading.
470 citations