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Rheological and microstructural investigation of oat -glucan isolates varying in molecular weight
This is an article published in International Journal of Biological Macromolecules 49 (2011) 369–377; doi:10.1016/j.ijbiomac.2011.05.014
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| Language: | English |
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International Journal of Biological Macromolecules
2024
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| _version_ | 1869483607408508928 |
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| access_status_str | Open Access |
| author | Agbenorhevi, Jacob K. Kontogiorgos, Vassilis Kirby, Andrew R. Morris, Victor, J. Tosh, Susan M. |
| author2 | 0000-0002-8516-7656 |
| author_browse | 0000-0002-8516-7656 Agbenorhevi, Jacob K. Kirby, Andrew R. Kontogiorgos, Vassilis Morris, Victor, J. Tosh, Susan M. |
| author_facet | 0000-0002-8516-7656 Agbenorhevi, Jacob K. Kontogiorgos, Vassilis Kirby, Andrew R. Morris, Victor, J. Tosh, Susan M. |
| author_sort | Agbenorhevi, Jacob K. |
| collection | Thesis |
| description | This is an article published in International Journal of Biological Macromolecules 49 (2011) 369–377; doi:10.1016/j.ijbiomac.2011.05.014 |
| format | Article |
| id | oai:ir.knust.edu.gh:123456789/15646 |
| institution | KNUST (Ghana) |
| language | English |
| last_indexed | 2026-07-01T04:01:41.328Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from KNUSTSpace — Kwame Nkrumah University of Science & Technology (Ghana) |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | International Journal of Biological Macromolecules |
| publisherStr | International Journal of Biological Macromolecules |
| record_format | dspace |
| source_str | KNUSTSpace — Kwame Nkrumah University of Science & Technology (Ghana) |
| spelling | oai:ir.knust.edu.gh:123456789/15646 Rheological and microstructural investigation of oat -glucan isolates varying in molecular weight Agbenorhevi, Jacob K. Kontogiorgos, Vassilis Kirby, Andrew R. Morris, Victor, J. Tosh, Susan M. 0000-0002-8516-7656 0000-0001-6016-7580 This is an article published in International Journal of Biological Macromolecules 49 (2011) 369–377; doi:10.1016/j.ijbiomac.2011.05.014 The rheological properties and microstructure of aqueous oat -glucan solutions varying in molecular weight were investigated. The structural features and molecular weights (MW) were characterized by 13C NMR spectroscopy and high performance size-exclusion chromatography (HPSEC), respectively. The microstructure of the -glucans dispersions was also examined by atomic force microscopy (AFM). The samples with -glucan content between 78 and 86% on a dry weight basis had MW, intrinsic viscosity ([ ]) and critical concentration (c*) in the range of 142–2800 × 103 g/mol, 1.7–7.2 dl/g and 0.25–1.10 g/dl, respectively. The flow and viscoelastic behaviour was highly dependent on MW and on the concentration of the -glucans dispersions. Pseudoplastic behaviour was exhibited at high concentrations and Newtonian behaviour was evident atlow concentrations. At the same concentration,the viscosity was higher for higher MW samples. The Cox–Merz rule was applicable for the lower molecular weight samples at higher concentrations whereas the high molecular weight sample deviated at concentrations greater than 1.0%,w/v. The mechanical spectra with variation of both MW and concentration were typical of entangled biopolymer solutions. AFM images revealed the formation of clusters or aggregates linked via individual polymer chains scattered heterogeneously throughout the system. The aggregate size increased with the molecular weight of the samples investigated and has been linked to the rheological behaviour of the samples. KNUST 2024-03-04T11:20:41Z 2024-03-04T11:20:41Z 2011 Article International Journal of Biological Macromolecules 49 (2011) 369–377 doi:10.1016/j.ijbiomac.2011.05.014 https://ir.knust.edu.gh/handle/123456789/15646 en application/pdf International Journal of Biological Macromolecules |
| spellingShingle | Agbenorhevi, Jacob K. Kontogiorgos, Vassilis Kirby, Andrew R. Morris, Victor, J. Tosh, Susan M. Rheological and microstructural investigation of oat -glucan isolates varying in molecular weight |
| title | Rheological and microstructural investigation of oat -glucan isolates varying in molecular weight |
| title_full | Rheological and microstructural investigation of oat -glucan isolates varying in molecular weight |
| title_fullStr | Rheological and microstructural investigation of oat -glucan isolates varying in molecular weight |
| title_full_unstemmed | Rheological and microstructural investigation of oat -glucan isolates varying in molecular weight |
| title_short | Rheological and microstructural investigation of oat -glucan isolates varying in molecular weight |
| title_sort | rheological and microstructural investigation of oat glucan isolates varying in molecular weight |
| url | https://ir.knust.edu.gh/handle/123456789/15646 |
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