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

• Published in: Carbohydrate polymers Vol. 329; p. 121757
• Main Authors: Bisht, Akshay, Goh, Kelvin K T, Sims, Ian M, Edwards, Patrick J B, Matia-Merino, Lara
• Format: Journal Article
• Language: English
• Published: England 01.04.2024
• Subjects: Mamaku polysaccharide; Molecular structure; Extensional rheology; Shear rheology; Shear-thickening
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2023.121757

A 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 H and C 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 (M ) was reduced with increasing age, from ~4.1 × 10 to ~2.1 × 10 Da from stage 1 to stage 3, respectively. This decrease in M (and size) consequently reduced the shear viscosity (η  > η  > η ). 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.