Green technologies for cascade extraction of Sargassum muticum bioactives

Pérez-Larrán, Patricia; Torres, M.D.; Flórez‐Fernández, Noelia; Balboa, Elena M.; Moure, Andrés; Domı́nguez, Herminia

doi:10.1007/s10811-018-1725-6

Cited by 18 publications

(10 citation statements)

References 130 publications

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“…This section details the concentrations (in the context of pollutants) of possible micropollutants detected in Sargassum spp. and, when available, the sorption processes proposed for pollutant intake and/or accumulation (Pérez-Larrán et al 2019).…”

Section: Pollutants Of Sargassum Sppmentioning

confidence: 99%

Sargassum contamination and consequences for downstream uses: a review

et al. 2020

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Sargassum spp. are brown algae present in the tropical and subtropical waters of the world's oceans. Benthic or pelagic, Sargassum spp. represent substantial amounts of biomass when drifted and massive beaching events also named "golden tides" are challenging for environmental and tourism managers. The Sargassum spp. biomass can be regarded as offering economic opportunities; however, micropollutant contamination counteracts this wealth. This review describes the contaminant uptake processes and the concentrations reached by various Sargassum species in regard to national and international norms for a variety of applications. Amongst the heavy metals, perhaps total arsenic content is the most salient: phytoaccumulation of arsenic is due to confusion in the phosphate transporter between arsenic and phosphate, thus leading Sargassum spp. to bioaccumulate arsenic actively. The levels reached could well give cause for concern across all potential applications, in particular for human and animal use. Similarly, there are concerns for the widespread applications or disposal of this biomass due to environmental impacts in the case of storage, landfill or composting. Organic micropollutants are too rarely studied to assert that there is global contamination. However, research studies focused on Sargassum spp. contamination confirmed environmental threats. But, without exhaustive analysis of routine algae contamination, the standard contamination level cannot be defined. Treating beach-cast or drifting Sargassum spp. as a waste is a Gordian knot, in that it involves investment, work and disposal surfaces, whilst not necessarily providing environmental and economic gains. However, Sargassum spp. are a raw material, a resource rich in a broad variety of constituents that could be processed for commercial applications or which could be used for production of energy. In this paper the authors review the diverse applications that can be considered and describe the relevant regulations and norms related to contaminants and effluents that need to be taken into account. However, if valorizing Sargassum spp. is currently valuable and promising, the quality of the raw material is a key starting point because fresh and sand-free algae are required: offshore gathering solutions need to be developed in order to limit Sargassum sp. contamination by pollutants from land so as to hinder algae decay.

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Section: Pollutants Of Sargassum Sppmentioning

confidence: 99%

Sargassum contamination and consequences for downstream uses: a review

et al. 2020

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“…As an alternative to the conventional time-and chemical-consuming processes, novel alginate extraction methodologies are being developed, i.e., based on reactive extrusion, which reduces time from about an hour to a few minutes, and reduces water and reactant requirements by more than two, enhancing extraction yield and rheological properties [25]. Furthermore, alginate extracted by a pressing stage exhibited similar viscoelastic features to those that are commercially available [26]. The results of the present study provide a broad range of alginates with different viscoelastic features using only water as an extraction agent, which could be interesting to cover potential food and non-food applications.…”

Section: Molecular Weight Distributionmentioning

confidence: 99%

Hydrothermal Processing of Laminaria ochroleuca for the Production of Crude Extracts Used to Formulate Polymeric Nanoparticles

et al. 2020

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A green extraction process using only water was proposed for the simultaneous extraction of alginate and bioactive compounds from Laminaria ochroleuca. Operation was carried out during non-isothermal heating up to maximal temperatures over the range of 70 °C to 100 °C. Once separated, the alginate and the crude extract were characterised and the biological activities and cytotoxicity of the extracts was studied, the latter in intestinal epithelial cells. Those alginates obtained at 90 °C exhibited the highest extraction yields and viscoelastic features of the corresponding hydrogels. The obtained results show that the extracts obtained by non-isothermal extraction were suitable to formulate nanoparticles, which showed the smallest size (≈250–350 nm) when the higher content of fucoidan extract was present. Given the evidenced properties, the extracts may find an application in the formulation of nanoparticulate carriers for drug delivery.

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“…Brown seaweeds are harvested from wild populations or farmed to provide valuable products, including texturing agents for the food industry, biofuels, fertilisers, animal feed, nutraceuticals, and cosmeceuticals (Kraan, 2013). A biorefinery approach, valorising different fractions of the biomass, has been put forward for S. muticum to obtain high value/low volume and high volume/low value products (Balboa et al, 2015;Pérez-Larrán et al, 2019). The prospect for valorisation of S. fluitans and S. natans biomass has not been unnoticed, and Milledge and Harvey (2016) have reviewed the potential uses and obstacles for exploitation of pelagic Sargassum.…”

Section: Introductionmentioning

confidence: 99%

Biomass composition of the golden tide pelagic seaweeds Sargassum fluitans and S. natans (morphotypes I and VIII) to inform valorisation pathways

Davis

Simister

Campbell

et al. 2021

Science of The Total Environment

101

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Massive strandings of the pelagic brown algae Sargassum have occurred in the Caribbean, and to a lesser extent, in western Africa, almost every year since 2011. These events have major environmental, health, and economic impacts in the affected countries. Once on the shore, Sargassum is mechanically harvested and disposed of in landfills. Existing commercial applications of other brown algae indicate that the pelagic Sargassum could constitute a valuable feedstock for potential valorisation. However, limited data on the composition of this Sargassum biomass was available to inform on possible application through pyrolysis or enzymatic fractionation of this feedstock. To fill this gap, we conducted a detailed comparative biochemical and elemental analysis of three pelagic Sargassum morphotypes identified so far as forming Atlantic blooms: Sargassum natans I (SnI), S. fluitans III (Sf), and S. natans VIII (SnVIII). Our results showed that SnVIII accumulated a lower quantity of metals and metalloids compared to SnI and Sf, but it contained higher amounts of phenolics and non-cellulosic polysaccharides. SnVIII also had more of the carbon storage compound mannitol. No differences in the content and composition of the cell wall polysaccharide alginate were identified among the three morphotypes. In addition, enzymatic saccharification of SnI produced more sugars compared to SnVIII and Sf. Due to high content of arsenic, the use of pelagic Sargassum is not recommended for nutritional purposes. In addition, low yields of alginate extracted from this biomass, compared with brown algae used for industrial production, limit its use as viable source of commercial alginates. Further work is needed to establish routes for future valorisation of pelagic Sargassum biomass.

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Green technologies for cascade extraction of Sargassum muticum bioactives

Cited by 18 publications

References 130 publications

Sargassum contamination and consequences for downstream uses: a review

Sargassum contamination and consequences for downstream uses: a review

Hydrothermal Processing of Laminaria ochroleuca for the Production of Crude Extracts Used to Formulate Polymeric Nanoparticles

Biomass composition of the golden tide pelagic seaweeds Sargassum fluitans and S. natans (morphotypes I and VIII) to inform valorisation pathways

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