Effects of processing high amylose maize starches under controlled conditions on structural organisation and amylase digestibility

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dc.contributor.authorHtoon, AKen_AU
dc.contributor.authorShrestha, AKen_AU
dc.contributor.authorFlanagan, BMen_AU
dc.contributor.authorLopez-Rubio, Aen_AU
dc.contributor.authorBird, ARen_AU
dc.contributor.authorGilbert, EPen_AU
dc.contributor.authorGidley, MJen_AU
dc.date.accessioned2009-09-29T06:48:51Zen_AU
dc.date.accessioned2010-04-30T05:06:18Zen_AU
dc.date.available2009-09-29T06:48:51Zen_AU
dc.date.available2010-04-30T05:06:18Zen_AU
dc.date.issued2009-01-22en_AU
dc.date.statistics2009-01-22en_AU
dc.description.abstractThe amylase digestibility of high-amylose maize starches has been compared before and after thermo-mechanical processing. Starches were analysed for enzyme-resistant starch yield, apparent amylose content, crystallinity (X-ray diffraction), and molecular order (NMR and FTIR), both before and after treatment with (x-amylase. All samples had significant (>10%) enzyme-resistant starch levels irrespective of the type and extent of thermal or enzymic processing. Molecular or crystalline order was not a pre-requisite for enzyme resistance. Near-amorphous forms of high amylose maize starches are likely to undergo recrystallisation during the enzyme-digestion process. The mechanism of enzyme resistance of granular high-amylose starches is found to be qualitatively different to that for processed high-amylose starches. For all samples, measured levels of enzyme resistance are due to the interruption of a slow digestion process, rather than the presence of completely indigestible material. © 2008, Elsevier Ltd.en_AU
dc.identifier.citationHtoon, A., Shrestha, A. K., Flanagan, B. M., Lopez-Rubio, A., Bird, A. R., Gilbert, E. P., & Gidley, M. J. (2009). Effects of processing high amylose maize starches under controlled conditions on structural organisation and amylase digestibility. Carbohydrate Polymers, 75(2), 236-245. doi:10.1016/j.carbpol.2008.06.016en_AU
dc.identifier.govdoc1405en_AU
dc.identifier.issn0144-8617en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleCarbohydrate Polymersen_AU
dc.identifier.pagination236-245en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.carbpol.2008.06.016en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1856en_AU
dc.identifier.volume75en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectStarchen_AU
dc.subjectAmylaseen_AU
dc.subjectMaizeen_AU
dc.subjectFourier transformationen_AU
dc.subjectDigestionen_AU
dc.subjectExtrusionen_AU
dc.titleEffects of processing high amylose maize starches under controlled conditions on structural organisation and amylase digestibilityen_AU
dc.typeJournal Articleen_AU
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