Extraction and characterization of sodium alginate from Moroccan Laminaria digitata brown seaweed

Fertah, Mohamed; Belfkira, Ahmed; Dahmane, El Montassir; Taourirte, Moha; Brouillette, François

doi:10.1016/j.arabjc.2014.05.003

Cited by 344 publications

(233 citation statements)

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“…Typically, by rising guluronic acid (G) content or molecular weight, more the stronger and brittle and the alginate gels may be achieved. Inversely, more flexible gels may form due to the high amount of alginate-M blocks [29,30]. Some studies also reported that the presence of homopolymeric block structure, namely mannuronic acid blocks (FMM), guluronic acid blocks (FGG) and alternating blocks (FMG) can influence gelling properties of alginate too [31].…”

Section: Chemical Propertiesmentioning

confidence: 99%

A review of extractions of seaweed hydrocolloids: Properties and applications

Khalil¹,

Lai²,

Tye³

et al. 2018

Express Polym. Lett.

151

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Section: Chemical Propertiesmentioning

confidence: 99%

A review of extractions of seaweed hydrocolloids: Properties and applications

Khalil¹,

Lai²,

Tye³

et al. 2018

Express Polym. Lett.

151

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“…Alginates naturally present in brown algae cell walls [1,2]. Alginates are polysaccharides found in brown algae, composed mainly by linear polymers of β-(1-4)-D-mannuronic (M), and α-L-gluronic (G) acids, which are different in terms of their proportions and linear arrangements [3,4].…”

Section: Introductionmentioning

confidence: 99%

Characterization and properties of sodium alginate from brown algae used as an ecofriendly superabsorbent

Helmiyati

Aprilliza

2017

IOP Conf. Ser.: Mater. Sci. Eng.

123

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Abstract. Sodium alginate obtained from the extraction of brown algae is used as the backbone for the synthesis of superabsorbent nanocomposite copolymerization. The first stage of extraction is the demineralization process using 0.1 M HCl solution and then 2% Na2CO3 solution for 2 hours at 60°C. The rendement of sodium alginate obtained was 44.32% with molecular weight of 40680 g/mol with measurement of the intrinsic viscosity. FTIR spectra of sodium alginate showed mannuronic acid functional group at wavenumber 884 cm -1 and the uronic acid at wavenumber 939 cm -1 , OH functional group at wavenumber 3200-3400 cm -1 , and CH2 stretching at wavenumber 2928 cm -1 . The diffraction pattern of isolated sodium alginate has specific 2θ at 13.068 and 21.096, amorphous intensity found specific 2θ at 18.058, and the obtained crystallinity degree of the sodium alginate is equal to 29.292% from the XRD analysis. The morphological analysis by SEM shows fibrils of isolated sodium alginate. The success isolation of sodium alginate from brown algae is supported by DSC which shows the decomposition temperature of pure sodium alginate and isolated alginate have close values, namely 251.12°C for pure sodium alginate and 229.90°C for isolated sodium alginate.

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“…The calculated M/G ratio is 1.13, which was obtained from the NMR spectra suggesting that a slightly higher amount of mannuronic acid than guluronic acid (M/G > 1) was incorporated in alginate (Fertah, Belfkira, Dahmane, Taourirte, & Brouillette, 2014).…”

Section: Resultsmentioning

confidence: 99%