Chemical Modification of Marine Polysaccharide (Alginate) By Free-Radical Graft Copolymerization― a Short Review

Salisu, Ahmed

doi:10.9790/5736-0433944

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…Additions of AOT or D 12 DAB are made to switch the system between states; the results are summarized in Table S1. D 12 DAB can also be used with alginic acid, another abundant natural anionic PE, 38 to form adjustable PE−surfactant complexes and enable control over emulsion morphology (Figure S6). Because the state boundary occurs at a lower molar ratio when using alginic acid and D 12 DAB compared to carboxymethyl cellulose and D 12 DAB; this result suggests that the CAC between alginic acid and D 12 DAB is lower than that between carboxymethyl cellulose and D 12 DAB.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Controlling the Emulsion Type Using Adjustable Polyelectrolyte–Surfactant Complexes

2020

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The combination of polyelectrolytes and ionic surfactants in precise proportions presents the possibility of producing a new class of emulsifiers with tunable emulsification properties. We use chitosan along with dioctyl sulfosuccinate sodium, also known as aerosol-OT (AOT), to demonstrate that emulsion types can be varied, and phase inversion emulsification (PIE) can be induced via changes in the water-phase pH and the molar ratio of the surfactant to the repeat unit of the polyelectrolyte. Confocal microscopy of the emulsions shows that the morphology can be changed from O/W to O/W/O to W/O by varying the surfactant to polyelectrolyte molar ratio at a fixed aqueous-phase pH while maintaining droplet sizes in the range of micrometers to tens of micrometers. Measurements of the oil (toluene)–water partition coefficient suggest that controlling the emulsion type relies on the ability of the surfactants to partition from the bulk oil to the bulk water phase and to induce polyelectrolyte–surfactant aggregation. We confirm this hypothesis using different combinations of polyelectrolytes and surfactants. Changes in the water-phase pH in situ induce phase inversion only in a particular direction, which suggests that the complexes at the interface are in a kinetically trapped state. Changes in the molar ratio in situ by addition of an oppositely charged surfactant also can induce phase inversion.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Controlling the Emulsion Type Using Adjustable Polyelectrolyte–Surfactant Complexes

2020

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“…41 Chemical modification of alginate by free-radical graft copolymerization has been reviewed. 42 Microwave-assisted alkaline modification of seaweed galactans has also been reported. 43 Esterification of various polysaccharides including seaweed polysaccharides has been reviewed by Heinze et al, (2006) 44 and Campo et al,…”

Section: Introductionmentioning

confidence: 99%

Functional modification mediated value addition of seaweed polysaccharides – a perspective

et al. 2015

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A diverse array of functionally modified seaweed polysaccharide derivatives were prepared, which would be described in this account principally based on the reports published by us during the last decade. The modification reactions involved esterification, -C-N-bond formation and amidation reactions engaging the C-6 carbon of one of the repeating pyranose moieties of the polysaccharides of seaweed species growing in Indian waters, occasionally employing grafting and crosslinking reactions. The new functional properties that were imparted on the modified polysaccharides as a result, included fluorogenicity, thixotropicity, pH-responsiveness and gelling/swelling/metal ion absorbing properties. Of these, some properties were targeted, some were obtained fortuitously, and the latter included thixotropicity and photosensitizer activity. This article showcases various polysaccharide based new materials and the value added seaweed biomass, presenting potential opportunities in this area of research.

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An overview on the potential biomedical applications of polysaccharides

Rajalekshmy

Devi

Joseph

et al. 2019

Functional Polysaccharides for Biomedical Applications

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Chemical Modification of Marine Polysaccharide (Alginate) By Free-Radical Graft Copolymerization― a Short Review

Cited by 7 publications

References 31 publications

Controlling the Emulsion Type Using Adjustable Polyelectrolyte–Surfactant Complexes

Controlling the Emulsion Type Using Adjustable Polyelectrolyte–Surfactant Complexes

Functional modification mediated value addition of seaweed polysaccharides – a perspective

An overview on the potential biomedical applications of polysaccharides

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