Are all ulvans equal? A comparative assessment of the chemical and gelling properties of ulvan from blade and filamentous Ulva

Kidgell, Joel T., Carnachan, Susan M., Magnusson, Marie, Lawton, Rebecca J., Sims, Ian M., Hinkley, Simon F.R., de Nys, Rocky, and Glasson, Christopher R.K. (2021) Are all ulvans equal? A comparative assessment of the chemical and gelling properties of ulvan from blade and filamentous Ulva. Carbohydrate Polymers, 264. 118010.

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Green seaweeds of the genus Ulva are rich in the bioactive sulfated polysaccharide ulvan. Herein we characterise ulvan from Ulva species collected from the Bay of Plenty, Aotearoa New Zealand. Using standardised procedures, we quantified, characterised, and compared ulvans from blade (U. australis, U. rigida, U. sp. B, and Ulva sp.) and filamentous (U. flexuosa, U. compressa, U. prolifera, and U. ralfsii) Ulva species. There were distinct differences in composition and structure of ulvans between morphologies. Ulvan isolated from blade species had higher yields (14.0–19.3 %) and iduronic acid content (IdoA = 7−18 mol%), and lower molecular weight (Mw = 190−254 kDa) and storage moduli (G' = 0.1–6.6 Pa) than filamentous species (yield = 7.2–14.6 %; IdoA = 4−7 mol%; Mw = 260−406 kDa; G' = 22.7–74.2 Pa). These results highlight the variability of the physicochemical properties of ulvan from different Ulva sources, and identifies a morphology-based division within the genus Ulva.

Item ID: 69845
Item Type: Article (Research - C1)
ISSN: 1879-1344
Keywords: Seaweed, Ulva, Sulfated polysaccharide, Ulvan, Rheology, Multivariate analysis
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Copyright Information: © 2021 Elsevier Ltd. All rights reserved.
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A version of this publication was included as Chapter 3 of the following PhD thesis: Kidgell, Joel Thomas (2021) The structure and bioactivity of ulvan, a sulfated polysaccharide from Ulva (chlorophyta). PhD thesis, James Cook University, which is available Open Access in ResearchOnline@JCU. Please see the Related URLs for access.

Date Deposited: 01 Nov 2021 21:50
FoR Codes: 34 CHEMICAL SCIENCES > 3404 Medicinal and biomolecular chemistry > 340403 Characterisation of biological macromolecules @ 33%
34 CHEMICAL SCIENCES > 3403 Macromolecular and materials chemistry > 340399 Macromolecular and materials chemistry not elsewhere classified @ 33%
31 BIOLOGICAL SCIENCES > 3101 Biochemistry and cell biology > 310199 Biochemistry and cell biology not elsewhere classified @ 34%
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