Structure and properties of three alginates from Madagascar seacoast algae

Rahelivao, Marie Pascaline; Andriamanantoanina, Hanta; Heyraud, A.; Rinaudo, Marguerite

doi:10.1016/j.foodhyd.2012.12.005

Cited by 48 publications

(25 citation statements)

References 14 publications

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“…EDTA (ethylendiaminetetraacetic acid) has known as a chelating agent and this, consequently, was improved the extract yield more than three times. Rahelivao et al (2013) reported that EDTA addition in three alga species Sargassum sp., Turbinaria sp. dan Hormophysa sp from Madagscar gave the highest yield.…”

Section: Alginate Extraction and Yieldmentioning

confidence: 99%

Characterizing the Three Different Alginate Type of Sargassum siliquosum

Yudiati

Isnansetyo

2017

Indo. J. Mar. Sci.

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Section: Alginate Extraction and Yieldmentioning

confidence: 99%

Characterizing the Three Different Alginate Type of Sargassum siliquosum

Yudiati

Isnansetyo

2017

Indo. J. Mar. Sci.

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“…A likely explanation for the extraction efficiency is the chelating effect of the carbonate ion (CO 3 2− ) that is present under alkaline conditions. A chelating salt that operates at lower pH could keep the alginate intact, and it has been shown that chelating salts can extract alginate close to neutral pH (Rahelivao et al 2013). Two factors known to improve the yield of alginate are increased extraction time and increased extraction temperature, however at the same time producing a more degraded alginate (Hernández-Carmona et al 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Several known effective chelators have been compared for the dissolution of alginate from algae, resulting in an almost complete extraction for all chelators, except for sodium carbonate performing slightly worse (Ahmad et al 1993). The addition of the effective chelator EDTA to an alginate extraction with sodium carbonate increases the extraction yield slightly, also indicating that sodium carbonate is good, but not optimal, for extraction (Rahelivao et al 2013). Two effective chelators, EDTA and CDTA, were compared in a study of extraction over time that yielded similar values for both (Wedlock et al 1987).…”

Section: Introductionmentioning

confidence: 99%

Multicomponent fractionation of Saccharina latissima brown algae using chelating salt solutions

Sterner

Edlund

2016

J Appl Phycol

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A fractionation strategy for Saccharina latissima algal biomass was developed utilizing chelating extraction salt solutions to mediate the liberation of algal components. Alginate, cellulose, laminarin, mannitol, protein, and inorganic salts were quantified in the fractions to reveal their individual dissolution patterns. Chelation power was identified as a key parameter for liberating alginate and increasing the yield of extracted components. The most efficient fractionation was achieved using aqueous sodium citrate as the extraction solution, producing an alginate-rich soluble fraction and a salt-poor insoluble fraction rich in cellulose and protein. Extractions at decreased pH were shown to be beneficial because they decreased the M/G ratio of the extracted alginate and concentrated the protein in the insoluble fraction from which it can easily be recovered; these effects could be achieved by switching the traditional sodium carbonate extraction solution with salts that have chelation capacity at lower pH. A cyclic extraction demonstrated that the sodium citrate solution can be reused for multiple alginate extractions with the buildup of the concentrations of other valuable components in the solution.

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“…Nuclear magnetic resonance (NMR) spectroscopy is a widely used method to detect M/G (Grasdalen, Larsen, & Smisrod, 1979;Grasdalen, Larsen, & Smisrod, 1981;Rahelivao, Andriamanatonnina, Heyraud, & Rinando, 2013). However, NMR requires substantial amounts of sample and spectra often need to be acquired at high temperature to decrease the viscosity of the alginate solution.…”

Section: Introductionmentioning

confidence: 99%