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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12771

Title: Structure and physicochemical properties of Ghanaian grewia gum
Authors: Kpodo, F.M.
Agbenorhevi, Jacob K.
Alba, K.
Smith, A.M.
Morris, G.A.
et. al
Keywords: Grewia mollis
Polysaccharides
Sugars
Isolation
Viscosity
Issue Date: Nov-2018
Publisher: Elsevier B.V.
Citation: F.M. Kpodo et al. / International Journal of Biological Macromolecules 122 (2019) 866–872. https://doi.org/10.1016/j.ijbiomac.2018.10.220
Abstract: Grewia polysaccharides were isolated using sodium metabisulphite and phosphate buffers and the influence of the different extraction techniques on the chemical composition and structural characteristics of the extracts were determined. Structure and chemical composition of the resulting polysaccharide extracts were determined using FT-IR andNMR spectroscopy, neutral sugar analysis, size exclusion chromatography coupled to multi-angle light scattering (SEC-MALS), dilute solution viscometry and steady shear rheology. Chemical composition was similar irrespectively of the extraction solvent used and ranged between 11.1 and 16.5% for protein, 53.4 and 66.9% for total carbohydrate, 18.5 and 35.1% for total uronic acid and 23.5 and 28.6% for rhamnose. Predominate sugars in the extracts were rhamnose and uronic acids with spectroscopy showing the presence of esterified groups. Intrinsic viscosity varied between 6.5 and 9.1 dL g−1 and related with molar mass (754–2778 × 103 g mol−1). Grewia polysaccharide dispersions at 1 g dL−1 exhibited a shear thinning flow behaviour with crude and sodiummetabisulphite extracts having higher viscosities. Overall, differences in extraction techniques produced grewia samples with tailored bulk properties for use in the food and pharmaceutical industries.
Description: An article published by Elsevier B.V. and also available at https://doi.org/10.1016/j.ijbiomac.2018.10.220
URI: http://hdl.handle.net/123456789/12771
Appears in Collections:College of Science

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