Journal
CARBOHYDRATE POLYMERS
Volume 264, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.118010
Keywords
Seaweed; Ulva; Sulfated polysaccharide; Ulvan; Rheology; Multivariate analysis
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Funding
- James Cook University
- Australian Government
- University of Waikato
- Tertiary Education Commission
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The study revealed significant differences in the yield, iduronic acid content, molecular weight, and storage moduli of ulvans from blade and filamentous Ulva species, highlighting the variability of their physicochemical properties and morphology-based division within the genus Ulva.
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.
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