Advanced structural characterisation of agar-based hydrogels: Rheological and small angle scattering studies

Advanced structural characterisation of agar-based hydrogels : Rheological and small angle scattering studies

Martinez-Sanz, Marta (author): IATA-CSIC, Spain,CSIC - Instituto de Agroquimica y Tecnologia de los Alimentos (IATA)

Ström, Anna, 1976 (author): Chalmers University of Technology, Sweden,Chalmers tekniska högskola

Lopez-Sanchez, Patricia, 1977 (author): RISE,Jordbruk och livsmedel,RISE Research Institutes of Sweden

Knutsen, Svein Halvor (author): Nofima AS, Norway,Norwegian Institute of Food, Fisheries and Aquaculture Research (Nofima)

Ballance, Simon (author): Nofima AS, Norway,Norwegian Institute of Food, Fisheries and Aquaculture Research (Nofima)

Zobel, Hanne Kristine (author): Nofima AS, Norway,Norwegian Institute of Food, Fisheries and Aquaculture Research (Nofima)

Sokolova, Anna (author): Australian Nuclear Science and Technology Organisation, Australia

Gilbert, Elliot (author): Australian Nuclear Science and Technology Organisation, Australia; University of Queensland, Australia

Lopez-Rubio, Amparo (author): IATA-CSIC, Spain,CSIC - Instituto de Agroquimica y Tecnologia de los Alimentos (IATA)

(creator_code:org_t)

Elsevier BV, 2020
2020
English.
In: Carbohydrate Polymers. - : Elsevier BV. - 0144-8617 .- 1879-1344. ; 236

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Abstract Subject headings

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.

By the author/editor: Martinez-Sanz, M ...; Ström, Anna, 197 ...; Lopez-Sanchez, P ...; Knutsen, Svein H ...; Ballance, Simon; Zobel, Hanne Kri ...; show more...; Sokolova, Anna; Gilbert, Elliot; Lopez-Rubio, Amp ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Polymer Chemistr ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Chemical Enginee ...; and Polymer Technolo ...

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