Levels of essential and toxic elements in Porphyra columbina and Ulva sp. from San Jorge Gulf, Patagonia Argentina

Pérez, Adriana Ángela; Farías, Silvia; Strobl, Analía Mabel; Pérez, Laura Beatriz; López, Clara Magdalena; Piñeiro, Adriana; Roses, Otmaro Enrique; Fajardo, María Angélica

doi:10.1016/j.scitotenv.2006.11.013

Cited by 50 publications

(28 citation statements)

References 30 publications

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“…Porphyra columbina is a red edible macroalga found on hard substratum in Patagonia Argentina coasts (Pérez et al 2007), mainly used as food. The residual cake derived from phycocolloid-obtaining process of red seaweed P. columbina is a waste, and there are no reported studies about ACE inhibitory and antioxidant activity of peptides or polyphenols derived from it.…”

Section: Introductionmentioning

confidence: 99%

Enzyme proteolysis enhanced extraction of ACE inhibitory and antioxidant compounds (peptides and polyphenols) from Porphyra columbina residual cake

et al. 2012

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The traditional method to obtain phycocolloids from seaweeds implies successive extraction steps with cold and hot water. The residual cake derived from phycocolloids obtaining process of red seaweed Porphyra columbina is a waste containing 27 % protein and 10.7-mg gallic acid equivalents (100 g) −1 . Seaweeds contain functional proteins, and the enzymatic hydrolysis of these proteins has been shown to release bioactive peptides. The aims of this study were to extract bioactive peptides and polyphenols after enzymatic hydrolysis of the residual cake and to evaluate their ACE inhibitory and antioxidant capacities (TEAC, DPPH, and copper-chelating activity). Residual cake hydrolysate has low molecular weight peptides containing Asp, Glu, Ala, and Leu. Residual cake hydrolysate had higher protein solubility than residual cake. ACE inhibition (≈45 %) and radical scavenging activity (TEAC and DPPH inhibition) were attributed mainly to low molecular weight peptides (500 Da) and polyphenols compounds released during proteolysis. The 50 % inhibition protein concentration value (IC50) corresponded to residual cake hydrolysate was 1.01±0.02 and 0.91±0.01 g L −1 , for ABTS and DPPH, respectively. Also, residual cake hydrolysate had high copperchelating activity (≈97.5 %). Hydrolysis could be used as a means to obtain ACE inhibitory and antioxidant compounds (peptides and polyphenols) from algae protein waste and add value to the phycocolloids extraction process.

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Section: Introductionmentioning

confidence: 99%

Enzyme proteolysis enhanced extraction of ACE inhibitory and antioxidant compounds (peptides and polyphenols) from Porphyra columbina residual cake

et al. 2012

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“…Despite the fact that metal uptake can be influenced by various factors-e. g., season, sampling position along the shoreline, coexistence of several metals, salinity, water temperature-algae have been used successfully to monitor metal availability. This has allowed for the assessment of spatial and temporal variation in metal concentration in coastal and estuarine environments and the comparison of trace metal levels between different geographic areas (e.g., Ho 1987;Brown et al 1999;Haritonidis and Malea 1999;Sawidis et al 2001; Barreiro et al 2002;Daka 2005;Zbikowski et al 2006;Pérez et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Macroalgae and DGT as indicators of available trace metals in marine coastal waters near a lead–zinc smelter

Schintu

Marras

Durante

et al. 2009

Environ Monit Assess

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The levels of Cd, Cu, Pb, and Zn were determined in the commonest species of green, red, and brown algae collected from five coastal sites in south-western Sardinia (Italy), an area with a long history of mining and smelting. The usefulness of employing Enteromorpha sp. and Padina pavonica (L.) Thivy to monitor metal pollution was evaluated, while diffusive gradients in thin films (DGT) devices were used to measure dissolved metals in seawater. Levels of Cd and Pb were high enough to be of environmental concern in the whole study area. A significant relationship was found between the content of Pb in P. pavonica and DGT-labile Pb in seawater, suggesting that gross elemental concentrations of nonessential metals such as Pb in algal tissues are apparently controlled by the abundance of dissolved metal species in the ambient seawater. The results pointed out the usefulness of using both DGT and algal methods for a better understanding of trace metal availability in coastal waters.

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“…However, both fungi and other fractions, for example, the rhizosphere and soil-root interface fractions, were noticeably enriched with Cd, although this was only significant for the soil-root interface fraction. The capability of fungal species for accumulating essential (Co, Ni) and nonessential (Pb) metals differs [16,17]. The Co, Ni, and Pb concentrations were generally evenly distributed between soil fractions and mycelium, whereas the concentration of these metals in sporocarps was lower.…”

Section: Discussionmentioning

confidence: 99%

“…However, the capacity for retaining metal among species of fungi is wide [16] and the capability of fungi to accumulate elements differs [17]. Essential nutrients, such as cobalt (Co) and nickel (Ni), and nonessential lead (Pb) appear to be excluded from fungi, as they do not accumulate [18,19].…”

Section: Introductionmentioning

confidence: 99%

Selected Metals in Various Fractions of Soil and Fungi in a Swedish Forest

Vinichuk

2012

ISRN Ecology

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The patterns of uptake and distribution of Co, Ni, Cu, Zn, Cd, and Pb in the soil-mycelium-sporocarps compartments in various transfer steps are presented. I attempted to find out whether there is a difference between the uptake of metals from soil to fungi (mycelium/soil ratio) and transport within fungal thalli (sporocarps/mycelium ratio). The concentration of Cu, Zn, and Cd increased in the order bulk soil < soil-root interface (or rhizosphere) < fungal mycelium < fungal sporocarps. The concentration of Co, Ni, and Pb decreased in the order bulk soil (or rhizosphere) < fungal mycelium < soil-root interface < fungal sporocarps. The uptake of Cu, Zn, and Cd during the entire transfer process in natural conditions between soil and sporocarps occurred against a concentration gradient. Mycorrhizal fungi (mycelium and sporocarps) only absorbed Co, Ni, and Pb but did not accumulate these elements in their thalli. Metal accumulation within fungal mycelium biomass in the top forest soil layer (0-5 cm) may account for about 5% of the total amount of Co, 4% Ni, 7% Cu, 8% Zn, 24% Cd, and 3% Pb.

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Levels of essential and toxic elements in Porphyra columbina and Ulva sp. from San Jorge Gulf, Patagonia Argentina

Cited by 50 publications

References 30 publications

Enzyme proteolysis enhanced extraction of ACE inhibitory and antioxidant compounds (peptides and polyphenols) from Porphyra columbina residual cake

Enzyme proteolysis enhanced extraction of ACE inhibitory and antioxidant compounds (peptides and polyphenols) from Porphyra columbina residual cake

Macroalgae and DGT as indicators of available trace metals in marine coastal waters near a lead–zinc smelter

Selected Metals in Various Fractions of Soil and Fungi in a Swedish Forest

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