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Advanced structural characterisation of agar-based hydrogels: Rheological and small angle scattering studies
IATA-CSIC, Spain.
Chalmers University of Technology, Sweden.
RISE - Research Institutes of Sweden (2017-2019), Bioscience and Materials, Agrifood and Bioscience.
Nofima AS, Norway.
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2020 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 236, article id 115655Article in journal (Refereed) Published
Abstract [en]

Agar-based extracts from Gelidium sesquipedale were generated by heat and combined heat-sonication, with and without the application of alkali pre-treatment. Pre-treatment yielded extracts with greater agar contents; however, it produced partial degradation of the agar, reducing its molecular weight. Sonication produced extracts with lower agar contents and decreased molecular weights. A gelation mechanism is proposed based on the rheological and small angle scattering characterization of the extracts. The formation of strong hydrogels upon cooling was caused by the association of agarose chains into double helices and bundles, the sizes of which depended on the agar purity and molecular weight. These different arrangements at the molecular scale consequently affected the mechanical performance of the obtained hydrogels. Heating of the hydrogels produced a gradual disruption of the bundles; weaker or smaller bundles were formed upon subsequent cooling, suggesting that the process was not completely reversible.

Place, publisher, year, edition, pages
2020. Vol. 236, article id 115655
Keywords [en]
Gelidium sesquipedale, Molecular weight, Rheology, SANSSAXS, Seaweed
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-44985DOI: 10.1016/j.carbpol.2019.115655Scopus ID: 2-s2.0-85077951196OAI: oai:DiVA.org:ri-44985DiVA, id: diva2:1431070
Available from: 2020-05-19 Created: 2020-05-19 Last updated: 2020-05-19

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