Characteristics of alginate from Laminaria digitata cultivated in a high-phosphate environment

Indergaard, Mentz; Skjåk‐Bræk, Gudmund

doi:10.1007/978-94-009-4057-4_80

Cited by 17 publications

(11 citation statements)

References 20 publications

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“…The physical properties of alginic acid in gels and algal tissues are determined largely by the relative amount of three types of blocks present in the copolymer (Cheshire and Hallam 1985;Indergaard and Skjak-Braek 1987;Indergaard et al . 1990).…”

Section: Discussionmentioning

confidence: 99%

Seasonal studies on the alginate and its biochemical composition I: Sargassum polycystum (Fucales), Phaeophyceae

2003

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Investigations were made on the brown seaweed Sargassum polycystum C. Agardh collected from Rameswaram Coast, Tamil Nadu. The alginates extracted from 'leaf', 'stem' and entire thallus of S. polycystum were investigated for their viscosity and chemical constituents, namely β -D-mannuronic acid (M-block), α -L-guluronic acid (G-block) and alternating sequences of β -D-mannuronic acid and α -L-guluronic acid (MG-block) for six different seasons between August 1998 and November 1999. Significant seasonal variation ( P < 0.05) was observed with high yield of alginate in February. The alginate extracted from the 'leaf' region showed a maximum yield whereas the 'stem' region exhibited maximum viscosity. The amount of G-block was found to be more than M-and MG-blocks in all the samples tested. The amount of G-block was high in 'stem' followed by 'leaf' and entire thallus. A positive correlation was recorded between viscosity and G-block. Among the three alginates, the ratio of M/G was low in the 'stem' followed by 'leaf' and entire thallus.

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Section: Discussionmentioning

confidence: 99%

Seasonal studies on the alginate and its biochemical composition I: Sargassum polycystum (Fucales), Phaeophyceae

2003

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“…The physical properties of alginates are largely determined by the relative amounts of the three types of blocks present in the co-polymer (Indergaard & Skjak-Braek, 1987;Indergaard et al, 1990). The gelation of alginates is dependent on the number and length of polyguluronate sequences (Miller, 1996).…”

Section: Introductionmentioning

confidence: 99%

Seasonal studies on alginate and its composition II: Turbinaria conoides (J.Ag.) Kütz. (Fucales, Phaeophyceae)

2006

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The alginates extracted from 'leaf', 'stem' and entire thallus of Turbinaria conoides (J.Ag.) Kütz. were investigated for their viscosity and biochemical constituents namely, β-D-mannuronic acid (M-block), α-L-guluronic acid (G-Block) and alternating sequences of β-D-mannuronic acid and α-L-guluronic acid (MG-block). Substantial seasonal variation was recorded with high yield of alginate during premonsoon. The yield of alginate was maximum in 'leaf' region. In contrast to this, viscosity and G-block were maximum in the 'stem' region. A significant positive correlation was observed between viscosity and G-block. The ratio of guluronic: mannuronic acid was also assessed. Low levels of M/G ratio were recorded in the 'stem' region followed by 'leaf' and entire thallus.

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“…It varies according to the extraction methodology and the location from which the algae was collected 29 , as well as according to seasonal and growth conditions 35 . The comparison of the M/G ratio from other Sargassum species is given in Table 2.…”

Section: Nmr Spectroscopy)mentioning

confidence: 99%

Characterization and evaluation of copper and nickel biosorption on acidic algae Sargassum Filipendula

et al. 2010

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The marine algae Sargassum filipendula was collected from São Paulo seashore (Brazil) and submitted to treatment with acid. The biosorption mechanisms of Cu 2+ and Ni 2+ ions onto acidic algae Sargassum filipendula were examined using various analytical techniques: Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and potentiometric titration (pH ZPC ). The effect of acidic treatment on algae by hydrochloric acid (pH 2.0, 3.0, 4.0 and 5.0) was evaluated for Cu 2+ and Ni 2+ adsorption. Alginate was extracted from raw algae and the two types of acids present in the biomass (β-D-mannuronic (M) and α-L-guluronic (G) acid) were characterized by 13 C NMR. The M/G ratio was found to be 0.50. According to the pH ZPC analysis, at a pH higher than 5.5 the acidified algae surface presents a negative charge. The FT-IR analyses showed that the main chemical groups involved in the biosorption were carboxylic, alcoholic, sulfonate and amino groups.

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Characteristics of alginate from Laminaria digitata cultivated in a high-phosphate environment

Cited by 17 publications

References 20 publications

Seasonal studies on the alginate and its biochemical composition I: Sargassum polycystum (Fucales), Phaeophyceae

Seasonal studies on the alginate and its biochemical composition I: Sargassum polycystum (Fucales), Phaeophyceae

Seasonal studies on alginate and its composition II: Turbinaria conoides (J.Ag.) Kütz. (Fucales, Phaeophyceae)

Characterization and evaluation of copper and nickel biosorption on acidic algae Sargassum Filipendula

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