The nutritional aspects of biorefined Saccharina latissima, Ascophyllum nodosum and Palmaria palmata

Abstract

The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that: • a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders. Please consult the full DRO policy for further details. Abstract The chemical profile of biorefined Saccharina latissima, Ascophylum nodosum and Palmaria palmata after carbohydrate and polyphenol extraction was analysed with the aim to evaluate the nutritional aspects of biorefined seaweeds as a novel animal feed supplement. Optimised enzymatic saccharification has been used to show that the protein concentration in the residue of Palmaria palmata and Ascophylum nodosum can be increased by more than two fold. Nutritional value of the residue was further enhanced through an increase in total amino acids and fatty acids. As a consequence of removal of inorganic elements such as sodium, potassium and chloride, the total solid and ash content of all three seaweeds was reduced by around 40%. In contrast, divalent metals such as iron and zinc, as well as silicon accumulated in all three residues. Potentially harmful components such as arsenic and iodine were reduced only in brown biorefined seaweeds, whilst in biorefined P. palmata iodine increased by 39% compared to a 24% decline of arsenic. Polyphenol removal in all three seaweeds was >80% and, in combination with enzymatic saccharification, enhanced protein recovery in A. nodosum. This highlights the potential of biorefinery concepts to generate multiple products from seaweed such as extracts enriched in polyphenols and carbohydrates and residue with higher protein and lipid content.

Modelling potential production of macroalgae farms in UK and Dutch coastal waters

“…For example, Gévaert et al (2001) observed that for S. latissima in the English Channel, the maximum carbon content is reached in September with the lowest concentrations occurring in March. Similar trends have also been reported for Norway (Sjøtun, 1993) and Scotland (Connolly and Drew, 1985). The minimum carbon concentration in March occurs when the growth rate of the algae is high and the plant growth is carried out at the expense of carbohydrate reserves.…”

“…There has been increasing interest in the potential of macroalgae cultivation across the Northern Hemisphere and Europe (Van der Burg et al, 2016), partially driven by research on biofuel technologies (Kerrison et al, 2015). The characteristics of Phaeophyta macroalgae, in particular high productivity, fast growth rate and high polysaccharide content, make them a suitable biomass for biofuel production (Hughes et al, 2012;Kerrison et al, 2015;Schiener et al, 2017;Fernand et al, 2017). A further advantage is that such third-generation biofuels do not need additional freshwater and do not compete for agricultural land like many existing biofuel sources.…”

“…latissima stores energy in the form of carbohydrates (e.g. mannitol and laminarin), the concentrations of which vary widely during the year and peak in the second part of the year (Black, 1950;Kain, 1979;Bartsch et al, 2008;Schiener et al, 2017). For example, Gévaert et al (2001) observed that for S. latissima in the English Channel, the maximum carbon content is reached in September with the lowest concentrations occurring in March.…”

Determinación de la actividad tóxica de extractos optimizados de Palmaria y Porphyra para el tratamiento de la lesión por isquemia/reperfusión

“…Estos efectos de carácter tóxico pueden tener lugar debido a metabolitos del propio vegetal [35,37,43] o a especies químicas de origen antrópico que el organismo fotosintético absorbe durante su vida [48,51,52].…”

Modelling potential production and environmental effects of macroalgae farms in UK and Dutch coastal waters

“…The characteristics of Phaeophyta macroalgae, in particular high productivity, fast growth rate and high polysaccharide content, make them a 10 suitable biomass for biofuels production (Hughes et al, 2012;Kerrison et al, 2015;Schiener et al, 2016;Fernand et al, 2017). A further advantage is that such third generation biofuels do not need additional freshwater and do not compete for agricultural land like many existing biofuel sources.…”