Characterization of Red Seaweed Extracts Treated by Water, Acid and Alkaline Solutions

Al‐Alawi, Ahmed; Chitra, P.; Al‐Mamun, Abdullah; Al-Marhubi, I.; Rahman, Mohammad Shafiur

doi:10.1515/ijfe-2017-0353

Cited by 7 publications

(3 citation statements)

References 41 publications

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“…17–45% [ 28 , 29 ]. Agar extracted in red seaweeds in the molecular weight range of 100–30,000 kDa [ 30 ]. Among the different fraction of polysaccharides (3.2, 10.5, 29.0, and 48.8 kDa) isolated from red seaweed Pyropia yezoensis, 3.2 kDa found as effective against stress protection [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Antioxidant and cytotoxic activities of sulfated polysaccharides from five different edible seaweeds

et al. 2020

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In recent times, there has been a growing interest in the exploration of antioxidants and global trend toward the usage of seaweeds in the food industries. The low molecular weight up to 14 kDa sulfated polysaccharides of seaweeds (Portieria hornemannii, Spyridia hypnoides, Asparagopsis taxiformis, Centroceras clavulatum and Padina pavonica) were evaluated for in vitro antioxidant activities and cytotoxic assay using HeLa cell line and also characterized by FTIR. The high yield (7.74% alga dry wt.) of sulfated polysaccharide was observed in P. hornemannii followed by S. hypnoides (0.69%), C. clavulaum (0.55%) and A. taxiformis (0.17%). In the brown seaweed P. pavonica, the sulfated polysaccharide yield was 2.07%. High amount of sulfate was recorded in the polysaccharide of A. taxiformis followed by C. clavulaum, P. pavonica, S. hypnoides and P. hornemannii as indicative for bioactivity. The FTIR spectroscopic analysis supports the sulfated polysaccharides of S. hypnoides, C. clavulatum and A. taxiformis are similar to agar polymer whereas the spectral characteristics of P. hornemannii have similarities to carrageenan. The higher DPPH activity and reducing power were recorded in the polysaccharide of brown seaweed P. pavonica than the red seaweeds as follows: DPPH activities: S. hypnoides > A. taxiformis > C. clavulatum > P. hornimanii; Reducing power: A. taxiformis > P. hornimanii > S. hypnoides > C. clavulatum. The polysaccharide fractions contain up to 14 kDa from red seaweeds P. hornemannii and S. hypnoides followed by brown seaweed P. pavonica exhibit cytotoxic activity in HeLa cancer cell line (and are similar to structural properties of carrageenan extracted from P. hornemannii). The low molecular weight agar like polymer of S. hypnoides and alginate like brown seaweed P. pavonica showing better in vitro antioxidant activities that are capable of exhibiting cytotoxicity against HeLa cell line can be taken up further in-depth investigation for nutraceutical study.

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Section: Resultsmentioning

confidence: 99%

Antioxidant and cytotoxic activities of sulfated polysaccharides from five different edible seaweeds

et al. 2020

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“…Agar, extracted from red seaweeds with a molecular weight range of 100-30,000 kDa [78], has been studied for its various polysaccharide fractions. Among these fractions, the 3.2 kDa fraction isolated from the red seaweed Pyropia yezoensis was found to be effective in stress protection [79].…”

Section: Agarmentioning

confidence: 99%

Algal Phycocolloids: Bioactivities and Pharmaceutical Applications

Lomartire

Gonçalves

2023

Marine Drugs

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Seaweeds are abundant sources of diverse bioactive compounds with various properties and mechanisms of action. These compounds offer protective effects, high nutritional value, and numerous health benefits. Seaweeds are versatile natural sources of metabolites applicable in the production of healthy food, pharmaceuticals, cosmetics, and fertilizers. Their biological compounds make them promising sources for biotechnological applications. In nature, hydrocolloids are substances which form a gel in the presence of water. They are employed as gelling agents in food, coatings and dressings in pharmaceuticals, stabilizers in biotechnology, and ingredients in cosmetics. Seaweed hydrocolloids are identified in carrageenan, alginate, and agar. Carrageenan has gained significant attention in pharmaceutical formulations and exhibits diverse pharmaceutical properties. Incorporating carrageenan and natural polymers such as chitosan, starch, cellulose, chitin, and alginate. It holds promise for creating biodegradable materials with biomedical applications. Alginate, a natural polysaccharide, is highly valued for wound dressings due to its unique characteristics, including low toxicity, biodegradability, hydrogel formation, prevention of bacterial infections, and maintenance of a moist environment. Agar is widely used in the biomedical field. This review focuses on analysing the therapeutic applications of carrageenan, alginate, and agar based on research highlighting their potential in developing innovative drug delivery systems using seaweed phycocolloids.

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“…Compilations on agar yield (10–43.4%) can be found in [37]. Cold extraction with distilled water at room temperature was reported for Gracilaria birdiae [61], but agar extracts prepared at 20 °C showed a wider size distribution (1–30,000 kDa) [62]. For the chemical liquefaction of agarose, acid prehydrolysis has been commonly employed [63,64,65].…”

Section: Components: Properties and Extractionmentioning

confidence: 99%

Integral Utilization of Red Seaweed for Bioactive Production

2019

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The hydrocolloids carrageenan and agar are the major fraction industrially extracted and commercialized from red seaweeds. However, this type of macroalgae also contains a variety of components with nutritional, functional and biological properties. In the context of sustainability and bioeconomy, where the integral utilization of the natural resources is incentivized, the sequential separation and valorization of seaweed components with biological properties of interest for food, nutraceuticals, cosmeceuticals and pharmaceuticals is proposed. In this work, a review of the available conventional and alternative greener and efficient extraction for obtaining red seaweed bioactives is presented. The potential of emerging technologies for the production of valuable oligomers from carrageenan and agar is also commented, and finally, the sequential extraction of the constituent fractions is discussed.

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Characterization of Red Seaweed Extracts Treated by Water, Acid and Alkaline Solutions

Cited by 7 publications

References 41 publications

Antioxidant and cytotoxic activities of sulfated polysaccharides from five different edible seaweeds

Antioxidant and cytotoxic activities of sulfated polysaccharides from five different edible seaweeds

Algal Phycocolloids: Bioactivities and Pharmaceutical Applications

Integral Utilization of Red Seaweed for Bioactive Production

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