The effect of drying on undervalued brown and red seaweed species: Bioactivity alterations

2021 ◽  
Author(s):  
Diana R. Julião ◽  
Cláudia Afonso ◽  
Ana Gomes‐Bispo ◽  
Narcisa M. Bandarra ◽  
Carlos Cardoso
Keyword(s):  
Red Seaweed ◽  
Seaweed Species

Copper, Zinc, Nickel, and Cobalt biosorption potential of Fucus vesiculosus (Phaeophyceae) and Gracilaria tikvahiae (Rhodophyta)

2009 ◽  
Vol 4 (2) ◽  
Author(s):  
A. Chaudhuri ◽  
M. Mitra ◽  
J.G. Schwarz ◽  
S. Schiewer
Keyword(s):  
Inductively Coupled Plasma ◽  
Brown Seaweed ◽  
Atomic Emission ◽  
Fucus Vesiculosus ◽  
Isotherm Models ◽  
Red Seaweed ◽  
Seaweed Species ◽  
Gracilaria Tikvahiae ◽  
Copper Zinc ◽  
Zinc Nickel

Dried raw and protonated biomasses of the brown seaweed Fucus vesiculosus and the red seaweed Gracilaria tikvahiae were used to study their biosorption performance for copper, zinc, nickel, and cobalt. Representative samples of both species were collected from Chincoteague Bay, Virginia. A series of “sorbate” or metal concentrations (10-450 mg L-1) were selected for each metal to compare the seaweeds' biosorption performance at pH 4.5 ± 0.1 and 25±1 °C. Samples were analyzed on Inductively Coupled Plasma-Atomic Emission Spectrometer (ICP-AES). Langmuir and Freundlich adsorption isotherm models for single solute systems were used to assess sorption performance. Both raw and protonated Fucus vesiculosus exhibited higher affinity for metal ions than Gracilaria tikvahiae, at both high and low ends of the concentration ranges. The protonated red seaweed species had maximum metal uptake values of 0.99 mequiv g-1 (copper), 0.39 mequiv g-1 (zinc), 0.66 mequiv g-1 (nickel) and 0.79 mequiv g-1 (cobalt). In comparison, protonated Fucus vesiculosus sorbed higher amounts (1.63, 1.10, 1.40, and 1.69 mequiv g-1 of the metals in the same order). The prospects of using the brown seaweed species in the treatment of industrial wastewaters in place of expensive, conventional ion-exchange resins are envisaged.

Seaweed resources of Tanzania: status, potential species, challenges and development potentials

2020 ◽  
Vol 63 (4) ◽  
pp. 371-380
Author(s):  
Flower E. Msuya
Keyword(s):  
Western Indian Ocean ◽  
Added Value ◽  
Red Seaweed ◽  
Seaweed Farming ◽  
Seaweed Species ◽  
Red Seaweeds ◽  
Commercial Farming ◽  
Commercial Species ◽  
Good Quality Seed ◽  
Seaweed Industry

AbstractTanzania is endowed with a rich biodiversity of seaweed species that grow naturally in its oligotrophic waters of the Western Indian Ocean. Most of these species are unexploited. Only two red seaweeds Eucheuma and Kappaphycus have been studied for commercial farming and the industrial production is based on these species. Another genus of red seaweed, Gracilaria, has been studied and experimented upon for potential farming while others such as the green Ulva, the red Hypnea and the brown Sargassum have been mentioned as potential species for farming. Farming technology used to cultivate the two commercial species is the shallow water off-bottom technology which is badly affected by the increase in surface seawater temperatures (climate change), causing massive die-backs and decreased seaweed production. Some deeper-water farming technologies have been developed but only tubular nets show promise and have been piloted. A number of opportunities exist in seaweed farming, which can be used to advance the industry. The future of the seaweed industry in Tanzania will depend on using the existing opportunities, including utilising the seaweed species already studied, exploring the potential of other seaweed species for farming, development of deeper-water farming technologies, added-value, and ensuring availability of good quality seed material.

scholarly journals STRUCTURAL CHARACTERIZATION OF AGAR EXTRACTED FROM SIX RED SEAWEED SPECIES GROWING IN THE COAST OF VIETNAM

2017 ◽  
Vol 25 (2) ◽  
pp. 395-403
Author(s):  
Tran Thi Thanh Van ◽  
Bui Minh Ly ◽  
Ngo Quoc Buu ◽  
Chu Dinh Kinh
Keyword(s):  
Structural Characterization ◽  
Algal Species ◽  
Gel Strength ◽  
Raw Material ◽  
Spectroscopic Methods ◽  
Red Seaweed ◽  
Seaweed Species ◽  
Coast Of Vietnam ◽  
Agar Production

Polysaccharides extracted from six red seaweed species growing in Vietnam have been studied. Characterisation of their structure by chemical and spectroscopic methods showed that all of them have a basic repeating structure of alternating 3-linked b-D-galactopyranosyl and 4-linked 3,6-anhydro a-L-galactopyranosyl units with substituted methyl ether groups.   The native agar offers only weak gelling abilities owing to the 4-linked a-L-galactopyranosyl 6-sulfate as its precursor. Conversion of this unit into the corresponding 3,6-anhydride by treating with hot alkali generally led to gel strength increasing. The agars from G. fisheri and G. firma are poorly substituted, while those from G.asiatica, G.tenustipitata and G. heteroclada are partly methylated on position 6 of the 3-linked b-D- galactose. Agar from Gelidiella acerosa is partlly methylated on both positions 6 and 2 of the 4linked 3,6-anhydro a-L-galactose.   The alkali- modified agars have been obtained in acceptable quantities with gel strength of 300932 g/cm2. The obtained results showed that all the six algal species are suitable as raw material for commercial agar production and worthy of further cultivation

Biochemical composition of two red seaweed species grown on the Brazilian coast

2011 ◽  
Vol 91 (9) ◽  
pp. 1687-1692 ◽  
Author(s):  
Vanessa Gressler ◽  
Mutue T Fujii ◽  
Aline P Martins ◽  
Pio Colepicolo ◽  
Jorge Mancini-Filho ◽  
...  
Keyword(s):  
Biochemical Composition ◽  
Brazilian Coast ◽  
Red Seaweed ◽  
Seaweed Species

Catalytic Approach for Production of Hydrocarbon Rich Bio-Oil from a Red Seaweed Species

2020 ◽  
pp. 109-133
Author(s):  
Sanjay Kumar ◽  
Priyanka Roat ◽  
Sonal Hada ◽  
Bhawna Chechani ◽  
Neetu Kumari ◽  
...  
Keyword(s):  
Red Seaweed ◽  
Seaweed Species ◽  
Bio Oil

scholarly journals DIVERSITY OF CULTIVABLE BACTERIA BY STRATEGIC ENRICHMENT ISOLATED FROM FARMED EDIBLE RED SEAWEED, Gracilaria sp.

2020 ◽  
Vol 4 (1) ◽  
pp. 17-20
Author(s):  
Najatul Suad Abdullah ◽  
Mohd Azrul Naim ◽  
Normawaty Mohd-Nor ◽  
Zaima Azira Zainal Abidin
Keyword(s):  
Potential Functions ◽  
Red Seaweed ◽  
Seaweed Cultivation ◽  
Beneficial Bacteria ◽  
Associated Bacteria ◽  
Seaweed Species ◽  
Functional Roles ◽  
Bacterial Phyla ◽  
Cultivable Bacteria

Research on bacteria associated with various red seaweed species are emerging due to the interest to understand bacteria-seaweed interaction and functional roles of bacteria in a seaweed environment. Edible red seaweed, Gracilaria sp. is farmed primarily in China, followed by Indonesia and Malaysia but little is known on its associated bacteria and potential functions. This study aimed to isolate and identify cultivable bacteria from extracts of seaweed samples collected from a seaweed cultivation farm in Kedah, Malaysia. The results are hoped to provide insights into beneficial bacteria that exist in the farmed seaweed environment. Through cultivation on strategic enrichment media, 18 isolates OTUs were identified from bacterial phyla Proteobacteria, Firmicutes, Bacteroidetes, and Actinobacteria. These phyla are ubiquitous in seawater and some isolates were homologous to bacteria in marine host cluster. Further investigation on these isolates is hoped to reveal how the isolated bacteria can be beneficial in a seaweed environment or for other biodiscoveries.

scholarly journals STUDY ON USING DATA OF FATTY ACIDS IN BOTANICAL CLASSIFICATION (CHEMOTAXONOMY) FOR RED SEAWEED SPECIES

2015 ◽  
Vol 15 (3) ◽  
Author(s):  
Le Tat Thanh ◽  
Pham Minh Quan ◽  
Nguyen Van Tuyet Anh ◽  
Dam Duc Tien ◽  
Do Trung Sy ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Red Seaweed ◽  
Seaweed Species ◽  
Using Data ◽  
Botanical Classification

Enzymatic hydrolysis of the industrial solid residue of red seaweed after agar extraction: Extracts characterization and modelling

2021 ◽  
Vol 126 ◽  
pp. 356-366
Author(s):  
E. Trigueros ◽  
M.T. Sanz ◽  
A. Filipigh ◽  
S. Beltrán ◽  
P. Riaño
Keyword(s):  
Enzymatic Hydrolysis ◽  
Solid Residue ◽  
Red Seaweed ◽  
Hydrolysis Of

scholarly journals Antiviral Activity of Carrageenans and Processing Implications

Marine Drugs ◽  
2021 ◽  
Vol 19 (8) ◽  
pp. 437
Author(s):  
Milena Álvarez-Viñas ◽  
Sandra Souto ◽  
Noelia Flórez-Fernández ◽  
Maria Dolores Torres ◽  
Isabel Bandín ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Antiviral Activity ◽  
Drug Delivery Systems ◽  
Biological Properties ◽  
Red Seaweed ◽  
Processing Conditions ◽  
Chemical Modifications ◽  
Viral Attachment ◽  
Extraction Stage ◽  
Composition Structure

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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