Effects of gamma irradiation and stearic acid, alone and in combination, on functional, structural, and molecular characteristics of high amylose maize starch

dc.contributor.authorOcloo, Fidelis C.K.
dc.contributor.authorMinnaar, Amanda
dc.contributor.authorEmmambux, Mohammad Naushad
dc.contributor.emailnaushad.emmambux@up.ac.zaen_US
dc.date.accessioned2014-09-04T10:23:12Z
dc.date.available2014-09-04T10:23:12Z
dc.date.issued2014-07
dc.description.abstractThe effects of gamma irradiation and stearic acid, alone and in combination, on functional, structural, and molecular characteristics of high amylose maize starch (Hylon VII, 60% amylose) were studied. Stearic acid (0, 1.5, and 5%) was added to Hylon VII starch, and then irradiated at 0, 30, and 60 kGy. Gamma irradiation significantly (p 0.05) increased solubility, water absorption capacity, and oil absorption capacity as well as decreased swelling power (at 90 and 95°C) of Hylon VII starch. These changes related well with increased amylose and decreased amylopectin content, decreased MW, and decreased transition endotherms of the starches due to gamma irradiation. Stearic acid addition significantly increased (p 0.05) water and oil absorption capacities, relative crystallinity as well as decreased solubility and swelling power of Hylon VII. Gamma irradiation had more effect on the molecular structure of Hylon VII compared with stearic acid. Gamma irradiation alone and with stearic acid did not seem to change the XRD pattern and microstructure of Hylon VII. The similar XRD pattern and morphology observed for irradiated and non-irradiated Hylon VII suggests that gamma irradiation depolymerizes amylose, and amylopectin mostly in the amorphous region of the starch to produce less branched or unbranched amylopectin. Gamma irradiation with stearic acid has potential in Hylon VII modification.en_US
dc.description.librarianhb2014en_US
dc.description.sponsorshipThis research was funded in part under the International Atomic Energy Agency (IAEA) Technical Cooperation (TC) project and Ghana Atomic Energy Commission (GHA/0/010, Government of Ghana).en_US
dc.description.urihttp://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1521-379Xen_US
dc.identifier.citationOcloo, FCK, Minnaar, A & Emmambux, MN 2014,'Effects of gamma irradiation and stearic acid, alone and in combination, on functional, structural, and molecular characteristics of high amylose maize starch', Starch - Stärke, vol. 66, no. 7-8, pp. 624-635.en_US
dc.identifier.issn0038-9056 (print)
dc.identifier.issn1521-379X (online)
dc.identifier.other10.1002/star.201300221
dc.identifier.urihttp://hdl.handle.net/2263/41919
dc.language.isoenen_US
dc.publisherWileyen_US
dc.rights© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. The definite version is available at : http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1521-379X.en_US
dc.subjectGamma irradiationen_US
dc.subjectSize exclusionen_US
dc.subjectDifferential scanning calorimetry (DSC)en_US
dc.subjectHigh amylose maize starchen_US
dc.subjectX-ray diffraction (XRD)en_US
dc.titleEffects of gamma irradiation and stearic acid, alone and in combination, on functional, structural, and molecular characteristics of high amylose maize starchen_US
dc.typePreprint Articleen_US

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