Tailoring hybrid carrageenans from Mastocarpus stellatus red seaweed using microwave hydrodiffusion and gravity

Barral-Martinez, Marta; Flórez‐Fernández, Noelia; Domı́nguez, Herminia; Torres, M.D.

doi:10.1016/j.carbpol.2020.116830

Cited by 23 publications

(16 citation statements)

References 40 publications

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“…The addition of ethanol increased the total yields and also the phenolic content in the extracts from 1.5 to 2.5 g GAE/100 g extract when compared to the stage with pure CO2. The latter value is comparable to that of extracts obtained by drying with microwave hydrodiffusion and gravity of the water phase [33]. The phenolic extraction yield attained in this experiment reached 1.9 mg/100 g M. stellatus, a value lower than that reported for other red seaweed processed under comparable conditions, i.e., Gracilaria mammillaris at 30 MPa, 60 °C and 8% ethanol yielded 3.8 mg GAE/100 g seaweed after 240 min [34].…”

Section: Supercritical Extraction With Ethanol Modified Cosupporting

confidence: 78%

Extraction of Fatty Acids and Phenolics from Mastocarpus stellatus Using Pressurized Green Solvents

et al. 2021

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Polyunsaturated fatty acids are well known for their protective properties in relation to different skin diseases. Although seaweeds possess a low lipid fraction, they could act as an alternative renewable source of polyunsaturated fatty acids whenever other valuable seaweed components are also valorized. In this study, a biorefinery process using Mastocarpus stellatus as a model seaweed was proposed. The process started with the supercritical carbon dioxide extraction of the lipid and phenolic fractions. The influence of pressure during extraction with pure supercritical CO2 was studied while operating at a selected temperature and solvent flow rate. Kinetic data obtained during the ethanol-modified supercritical CO2 extraction were fitted to the spline model. Sequential processing was proposed with (i) pure CO2 to obtain a product with 30% PUFA content and ω-3:ω-6 ratio 1:1, (ii) ethanol-modified CO2 to extract phenolics, and (iii) microwave-assisted subcritical water extraction operating under previously optimized conditions for the extraction of phenolics, carrageenan and protein fractions. The composition of the supercritical extracts showed potential for use in both dietary and topical applications in skin care products. The remaining solids are suitable for the extraction of other valuable fractions.

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Section: Supercritical Extraction With Ethanol Modified Cosupporting

confidence: 78%

Extraction of Fatty Acids and Phenolics from Mastocarpus stellatus Using Pressurized Green Solvents

et al. 2021

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“…Algae were stored in closed dark plastic bags at room temperature before and after being milled until to be processed. Fundamental chemical properties of the raw material were reported in a parallel work [24].…”

Section: Raw Materialsmentioning

confidence: 99%

“…Microwave assisted extraction (MAE) is a relatively new, green and scalable process for the recovery of high valuable natural compounds [10,20,21,22], that could also be an attractive alternative for the recovery of hybrid carrageenans or antioxidants from macroalgae [23,24]. MAE allows a fast and uniform extraction, compact equipment, fast start-up, short time, less solvent and energy, which can be explained by the effect of microwaves on molecules by ionic conduction and dipole rotation [25,26].…”

mentioning

confidence: 99%

The microwave assisted extraction sway on the features of antioxidant compounds and gelling biopolymers from Mastocarpus stellatus

2020

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Microwave assisted water extraction of hybrid carrageenan and antioxidant compounds from Mastocarpus stellatus red alga was first proposed to recover biopolymers with specific rheological properties, saving time, avoiding chemicals and enhancing extraction yields when compared with conventional treatments. The hybrid carrageenans, precipitated from the liquid fractions recovered after microwave assisted water extraction were analyzed by Fourier transform infrared attenuated total reflectance, high-performance size-exclusion chromatography and rheology. The corresponding soluble extracts were also characterized by total phenolic content, antioxidant capacity, proteins, sulfate and carbohydrate content. The highest phenolic, antioxidant capacity and sulfate content were observed at 190°C, without notable effect of heating time between 3 and 6 min. In contrast, a clear impact of both microwave heating temperature and time on the molecular weight distribution of hybrid carrageenans as well as on the viscoelastic behavior of formulated hydrogels was identified, being the strongest hydrogels achieved at 170°C for 6 min. It should be highlighted that all proposed hydrogels exhibited stable mechanical properties in the absence of syneresis for a month of cold storage, except those made with biopolymers obtained with the mildest extraction conditions (3 min at 70°C).

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“…Compared to the conventional method, the use of microwave-assisted extraction allows similar yields in shorter times and with lower alkali concentration during pretreatment [ 136 ] and provides increased antiviral activity of Soliera chordalis ι-carrageenan against HSV-1 [ 66 ]. No changes in the chemical structure due to microwave radiation were evident compared to carrageenan extracted under the conventional method; the total sulfate and d -anhydrogalactose (D-AHG) contents in carrageenan treated with 1% KOH under different microwave conditions were close to the values for commercial ι-carrageenan.…”

Section: Processingmentioning

confidence: 99%

Antiviral Activity of Carrageenans and Processing Implications

et al. 2021

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Carrageenan and carrageenan oligosaccharides are red seaweed sulfated carbohydrates with well-known antiviral properties, mainly through the blocking of the viral attachment stage. They also exhibit other interesting biological properties and can be used to prepare different drug delivery systems for controlled administration. The most active forms are λ-, ι-, and κ-carrageenans, the degree and sulfation position being determined in their properties. They can be obtained from sustainable worldwide available resources and the influence of manufacturing on composition, structure, and antiviral properties should be considered. This review presents a survey of the antiviral properties of carrageenan in relation to the processing conditions, particularly those assisted by intensification technologies during the extraction stage, and discusses the possibility of further chemical modifications.

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Tailoring hybrid carrageenans from Mastocarpus stellatus red seaweed using microwave hydrodiffusion and gravity

Cited by 23 publications

References 40 publications

Extraction of Fatty Acids and Phenolics from Mastocarpus stellatus Using Pressurized Green Solvents

Extraction of Fatty Acids and Phenolics from Mastocarpus stellatus Using Pressurized Green Solvents

The microwave assisted extraction sway on the features of antioxidant compounds and gelling biopolymers from Mastocarpus stellatus

Antiviral Activity of Carrageenans and Processing Implications

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