Does harvesting age matter? Changes in structure and rheology of a shear-thickening polysaccharide from Cyathea medullaris as a function of age

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dc.citation.volume329
dc.contributor.authorBisht A
dc.contributor.authorGoh KKT
dc.contributor.authorSims IM
dc.contributor.authorEdwards PJB
dc.contributor.authorMatia-Merino L
dc.date.accessioned2024-01-26T01:24:20Z
dc.date.accessioned2024-07-25T06:37:18Z
dc.date.available2024-01-03
dc.date.available2024-01-26T01:24:20Z
dc.date.available2024-07-25T06:37:18Z
dc.date.issued2024-04-01
dc.description.abstractA shear-thickening polysaccharide from the New Zealand Black tree fern (Cyathea medullaris, commonly known as mamaku) extracted from different age fronds (stage 1: young, stage 2: fully grown and stage 3: old) was characterised in terms of structure and rheological properties. Constituent sugar analysis and 1H and 13C NMR revealed a repeating backbone of −4)-β-D-GlcpA-(1 → 2)-α-D-Manp-(1→, for all mamaku polysaccharide (MP) samples from different age fronds without any alterations in molecular structure. However, the molecular weight (Mw) was reduced with increasing age, from ~4.1 × 106 to ~2.1 × 106 Da from stage 1 to stage 3, respectively. This decrease in Mw (and size) consequently reduced the shear viscosity (ηs-Stage 1 > ηs-Stage 2 > ηs-Stage 3). However, the extent of shear-thickening and uniaxial extensional viscosity of MP stage 2 was greater than MP stage 1, which was attributed to a greater intermolecular interaction occurring in the former. Shear-thickening behaviour was not observed in MP stage 3.
dc.description.confidentialfalse
dc.identifier.citationBisht A, Goh KKT, Sims IM, Edwards PJB, Matia-Merino L. (2024). Does harvesting age matter? Changes in structure and rheology of a shear-thickening polysaccharide from Cyathea medullaris as a function of age. Carbohydrate Polymers. 329.
dc.identifier.doi10.1016/j.carbpol.2023.121757
dc.identifier.eissn1879-1344
dc.identifier.elements-typejournal-article
dc.identifier.issn0144-8617
dc.identifier.number121757
dc.identifier.piiS0144861723012225
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/70556
dc.languageEnglish
dc.publisherElsevier Ltd
dc.publisher.urihttps://www.sciencedirect.com/science/article/pii/S0144861723012225
dc.relation.isPartOfCarbohydrate Polymers
dc.rights(c) 2024 The Author/s
dc.rightsCC BY-NC-ND 4.0
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectMamaku polysaccharide
dc.subjectShear-thickening
dc.subjectMolecular structure
dc.subjectShear rheology
dc.subjectExtensional rheology
dc.titleDoes harvesting age matter? Changes in structure and rheology of a shear-thickening polysaccharide from Cyathea medullaris as a function of age
dc.typeJournal article
pubs.elements-id485724
pubs.organisational-groupOther
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