Journal
CARBOHYDRATE POLYMERS
Volume 236, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.115655
Keywords
Seaweed; Gelidium sesquipedale; Rheology; SAXS; SANS; Molecular weight
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Funding
- ALBA [2018022638]
- Agencia Estatal de Investigacion [PCI2018-092886]
- European Union's Horizon 2020 research and innovation programme (ERA-Net SUSFOOD2)
- COST Action European network for algal-bioproducts (EUALGAE) [ES1408]
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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.
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