Dependence upon Uronic Acid Composition of Some Ion-Exchange Properties of Alginates.

Smidsrød, Olav; Haug, Arne; Karvonen, Pertti; Virtanen, Artturi I.; Paasiv́irta, Jaakko

doi:10.3891/acta.chem.scand.22-1989

Cited by 137 publications

(45 citation statements)

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“…This may relate to the presence of other compounds, particularly fucoidan, which contribute to metal sequestration or to different chemical composition of alginates (Figueira et al 1999;Davis et al 2003b;Sheng et al 2004). Smidsrod and Haug (1968) report that affinity of alginate for divalent cations increased with increasing content of guluronic acid residues. No reports related to alginate composition of S. Fig.…”

Section: Cadmium Biosorption Capacity and Concentration Of Alginatementioning

confidence: 97%

Biosorption Capacity for Cadmium of Brown Seaweed Sargassum sinicola and Sargassum lapazeanum in the Gulf of California

Patrón-Prado

Casas-Valdéz

Servière‐Zaragoza

et al. 2011

Water Air Soil Pollut

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Brown algae Sargassum sinicola and Sargassum lapazeanum were tested as cadmium biosorbents in coastal environments close to natural and enriched areas of phosphorite ore. Differences in the concentration of cadmium in these brown algae were found, reflecting the bioavailability of the metal ion in seawater at several sites. In the laboratory, maximum biosorption capacity (q max ) of cadmium by these nonliving algae was determined according to the Langmuir adsorption isotherm as 62.42±0.44 mg g −1 with the affinity constant (b) of 0.09 and 71.20±0.80 with b of 0.03 for S. sinicola and S. lapazeanum, respectively. Alginate yield was 19.16±1.52% and 12.7±1.31%, respectively. Although S. sinicola had far lower biosorption capacity than S. lapazeanum, the affinity for cadmium for S. sinicola makes this alga more suitable as a biosorbent because of its high q max and large biomass on the eastern coast of the Baja California Peninsula. Sargassum biomass was estimated at 180,000 t, with S. sinicola contributing to over 70%.

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Section: Cadmium Biosorption Capacity and Concentration Of Alginatementioning

confidence: 97%

Biosorption Capacity for Cadmium of Brown Seaweed Sargassum sinicola and Sargassum lapazeanum in the Gulf of California

Patrón-Prado

Casas-Valdéz

Servière‐Zaragoza

et al. 2011

Water Air Soil Pollut

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“…The same order of selectivity was obtained by Kohn [71,72,75]. Ion exchange properties of pectins were determined at the same time [76]. Recently, the mechanism of interaction of manganese and calcium was investigated in relation with the charge parameter without any large difference [77].…”

Section: Ionic Selectivitymentioning

confidence: 90%

Polyelectrolyte properties of a plant and animal polysaccharide

Rinaudo¹

2009

Struct Chem

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The principal properties of polyelectrolytes in aqueous solution are reviewed; experimental data obtained about polysaccharides in our laboratory identify the main electrostatic interactions which occur between macromolecular chains, between ionic sites on isolated chains or between counterions and polyelectrolytes. Two examples are described. Hyaluronan, a linear alternated copolymer type with one anionic site per repeat unit, is very soluble in water, with a persistence length around 8 nm and a rheological behavior directly related to the molecular weight and polymer concentration in the presence of external monovalent electrolyte. The second example is that of pectin for which the influence of the charge density is studied. It exhibits an important ionic selectivity among divalent counterions in dilute solution with a dimer formation followed by aggregation and gelation.

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“…The unique properties of alginate, a naturally occurring biopolymer, have made it the most widely used polymer in this field (45). Alginate is a seaweed extract composed of chains of alternating α-L-guluronic (G) acid and β-D-mannuronic (M) acid residues in varying proportions (21,40). Alginate can be ionically cross-linked by the addition of divalent cations such as calcium chloride or barium chloride (7).…”

Section: Viability and Functionality Of Bcc In Alginate-pll Microcapsmentioning

confidence: 99%

Viability and Functionality of Bovine Chromaffin Cells Encapsulated into Alginate-PLL Microcapsules with a Liquefied Inner Core

Moustafa

Girod²,

Tortosa

et al. 2006

Cell Transplant

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Implantation of adrenal medullary bovine chromaffin cells (BCC), which synthesize and secrete a combination of pain-reducing neuroactive compounds including catecholamines and opioid peptides, has been proposed for the treatment of intractable cancer pain. Macro-or microencapsulation of such cells within semipermeable membranes is expected to protect the transplant from the host's immune system. In the present study, we report the viability and functionality of BCC encapsulated into microcapsules of alginate-poly-Llysine (PLL) with a liquefied inner core. The experiment was carried out during 44 days. Empty microcapsules were characterized in terms of morphology, permeability, and mechanical resistance. At the same time, the viability and functionality of both encapsulated and nonencapsulated BCC were evaluated in vitro. We obtained viable BCC with excellent functionality: immunocytochemical analysis revealed robust survival of chromaffin cells 30 days after isolation and microencapsulation. HPLC assay showed that encapsulated BCC released catecholamines basally during the time course study. Taken together, these results demonstrate that viable BCC can be successfully encapsulated into alginate-PLL microcapsules with a liquefied inner core.

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Dependence upon Uronic Acid Composition of Some Ion-Exchange Properties of Alginates.

Cited by 137 publications

References 0 publications

Biosorption Capacity for Cadmium of Brown Seaweed Sargassum sinicola and Sargassum lapazeanum in the Gulf of California

Biosorption Capacity for Cadmium of Brown Seaweed Sargassum sinicola and Sargassum lapazeanum in the Gulf of California

Polyelectrolyte properties of a plant and animal polysaccharide

Viability and Functionality of Bovine Chromaffin Cells Encapsulated into Alginate-PLL Microcapsules with a Liquefied Inner Core

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