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Título: | Understanding nanostructural differences in hydrogels from commercial carrageenans: Combined small angle X-ray scattering and rheological studies |
Autor: | Fontes, Cynthia; Ström, Anna; Gómez-Mascaraque, Laura G. CSIC ORCID; López-Rubio, Amparo CSIC ORCID ; Martínez Sanz, Marta CSIC ORCID | Palabras clave: | Polysaccharide Seaweed Gelation Scattering Food texture |
Fecha de publicación: | 21-mar-2020 | Editor: | Elsevier | Citación: | Algal Research 47: 101882 (2020) | Resumen: | Hydrogels from commercial carrageenans (κ-C, ι-C, λ↑-C (high viscosity) and λ↓-C (low viscosity)) were prepared with and without the addition of salts (KCl and CaCl2). FT-IR and 1H NMR characterization evidenced that while the κ-C and ι-C grades were relatively pure carrageenans, the two λ-C grades were λ-, κ-, θ- and μ-carrageenan hybrids. The effect of carrageenan and salt concentration on the hydrogel strength were evaluated through a response surface design and a detailed structural characterization was carried out by small angle X-ray scattering (SAXS) and rheology. The low amount of sulphate substitution in κ-C enabled intramolecular association, giving rise to strong hydrogels, even in the absence of salts. On the other hand, ι-C, λ↑-C and λ↓-C produced much weaker hydrogels and required the addition of salts to induce intramolecular association by ionic cross-linking. SAXS results suggested the formation of similar structures of double helices in κ-C and ι-C with the addition of salts; however, distinct network structures were attained. In the case of κ-C, a Gauss-Lorentz gel model was suitable to describe the hydrogel structure and the addition of K+ promoted the formation of more ordered and densely packed structures. On the other hand, larger but weaker aggregates, with marked periodicity, were observed in ι-C, with Ca2+ inducing the formation of more densely packed networks. The complex composition of the λ-C grades gave rise to more heterogeneous branched network structures, properly described by a correlation length model, where the gelation mechanism was mostly governed by the κ-carrageenan component. | Versión del editor: | https://doi.org/10.1016/j.algal.2020.101882 | URI: | http://hdl.handle.net/10261/205748 | DOI: | 10.1016/j.algal.2020.101882 | ISSN: | 2211-9264 |
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AlgalRes21032020-Fontes.pdf | Artículo principal | 2,94 MB | Adobe PDF | Visualizar/Abrir |
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