Novel approach for calculating starch crystallinity and its correlation with double helix content: a combined XRD and NMR study

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dc.contributor.authorLopez-Rubio, Aen_AU
dc.contributor.authorFlanagan, BMen_AU
dc.contributor.authorGilbert, EPen_AU
dc.contributor.authorGidley, MJen_AU
dc.date.accessioned2009-11-05T05:30:43Zen_AU
dc.date.accessioned2010-04-30T05:07:02Zen_AU
dc.date.available2009-11-05T05:30:43Zen_AU
dc.date.available2010-04-30T05:07:02Zen_AU
dc.date.issued2008-09en_AU
dc.date.statistics2008-09en_AU
dc.description.abstractA peak fitting procedure has been implemented for calculating crystallinity in granular starches. This methodology, widely used for synthetic polymers, is proposed to better reflect the crystalline content of starches than the method normally used, in which it is assumed that relatively perfect crystalline domains are interspersed with amorphous regions. The new approach takes into account irregularities in crystals that are expected to exist in semicrystalline materials. Therefore, instead of assuming that the amorphous background extends up to the base of diffraction peaks, the whole X-ray diffraction (XRD) profile is fitted to an amorphous halo and several discrete crystalline diffraction peaks. The crystallinity values obtained from the XRD patterns of a wide range of native starches using this fitting technique are very similar to the double helix contents as measured by C-13 solid state NMR, suggesting that double helices in granular starches are present within irregular crystals. This contrasts with previous descriptions of crystalline and noncrystalline double helices that were based on the analysis of XRD profiles as perfect crystals interspersed in a noncrystalline background. Furthermore, with this fitting methodology it is possible to calculate the contribution from the different crystal polymorphs of starch to the total crystallinity. © 2008, Wiley-Blackwell.en_AU
dc.identifier.citationLopez-Rubio, A., Flanagan, B. M., Gilbert, E. P., & Gidley, M. J. (2008). Novel approach for calculating starch crystallinity and its correlation with double helix content: a combined XRD and NMR study. Biopolymers, 89(9), 761-768. doi:10.1002/bip.21005en_AU
dc.identifier.govdoc1449en_AU
dc.identifier.issn0006-3525en_AU
dc.identifier.issue9en_AU
dc.identifier.journaltitleBiopolymersen_AU
dc.identifier.pagination761-768en_AU
dc.identifier.urihttp://dx.doi.org/10.1002/bip.21005en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2212en_AU
dc.identifier.volume89en_AU
dc.language.isoenen_AU
dc.publisherWiley-Blackwellen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectNuclear magnetic resonanceen_AU
dc.subjectStarchen_AU
dc.subjectCrystallographyen_AU
dc.subjectAmorphous stateen_AU
dc.subjectPolymersen_AU
dc.titleNovel approach for calculating starch crystallinity and its correlation with double helix content: a combined XRD and NMR studyen_AU
dc.typeJournal Articleen_AU
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