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

Authors :
Rebecca Lawton
Joel T. Kidgell
Christopher R. K. Glasson
Simon F.R. Hinkley
Susan M. Carnachan
Marie Magnusson
Ian M. Sims
Rocky de Nys
Source :
Carbohydrate polymers. 264
Publication Year :
2021

Abstract

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.

Details

ISSN :
18791344
Volume :
264
Database :
OpenAIRE
Journal :
Carbohydrate polymers
Accession number :
edsair.doi.dedup.....b22e6b21c23223de33b1a511e91402e4