The post-dehydration processing and the effects on the structural modifications and functionalities of milk protein powders

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dc.contributor.advisor Miao, Song en
dc.contributor.advisor Cronin, Kevin en
dc.contributor.advisor Fitzpatrick, John J. en
dc.contributor.author Ji, Junfu
dc.date.accessioned 2017-05-31T10:47:50Z
dc.date.issued 2017
dc.date.submitted 2017
dc.identifier.citation Ji, J. 2017. The post-dehydration processing and the effects on the structural modifications and functionalities of milk protein powders. PhD Thesis, University College Cork. en
dc.identifier.endpage 237 en
dc.identifier.uri http://hdl.handle.net/10468/4034
dc.description.abstract The variability of the raw materials, the diversity of the chemical compositions and the heterogeneity of structures are believed to contribute to the complexity in the physicochemical behaviours of dairy powders. Post-dehydration technology is widely used as an effective method to modify the structural properties and potentially improve the functionalities of dairy powder. In the present study, the dairy powders were firstly agglomerated by fluidised bed (FB) to investigate the effects on their rehydration processes. Then milk protein isolate powder (MPI) was used as the model system, which was agglomerated by fluidised bed and high shear mix (HS) granulators, using different liquid binders and comparing different granule sizes. The impact of both agglomeration methods on powder structures, as well as the consequent effects on the rehydration abilities, flowability and water adsorption are investigated. MPI agglomerated by FB had the more irregular shapes and porous structures. However, densely packed structures of HS granules caused the higher bulk density and lower porosity. Their shapes were more like spheres with smoother surfaces. FB agglomeration significantly improved the dynamic wetting of MPI and micellar casein powders, by requiring shorter wetting time, being more quickly penetrated by water droplets and absorbing more water by capillary force. But the influences on whey protein were limited, only if using lecithin as a liquid binder. Agglomeration exhibited no advantageous effects on the solubilisation of milk protein powders. The HS granules even delayed the release of materials. The denselypacked structures made MPI adsorbed least moisture and showed the slowest adsorption kinetics. Meanwhile, these MPI granules have significantly better powder flow behaviours. The study provided information about the post-dehydration process as a useful technique to modify the structures of dairy powders, which could be helpful to enhance the wetting process, control the water adsorption and improve the powder flowability. en
dc.description.sponsorship Department of Agriculture, Food and the Marine (Food Institutional Research Measure (11-F-001)) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2017, Junfu Ji. en
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/ en
dc.subject Dairy powder en
dc.subject Agglomeration en
dc.subject Powder rehydration en
dc.subject Coating en
dc.subject Powder structures en
dc.title The post-dehydration processing and the effects on the structural modifications and functionalities of milk protein powders en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Food Science and Technology) en
dc.internal.availability Full text not available en
dc.check.info Restricted to everyone for three years en
dc.check.date 2020-05-30T10:47:50Z
dc.description.version Accepted Version
dc.contributor.funder Department of Agriculture, Food and the Marine en
dc.description.status Not peer reviewed en
dc.internal.school Process & Chemical Engineering en
dc.internal.school Teagasc en
dc.check.reason This thesis is due for publication or the author is actively seeking to publish this material en
dc.check.opt-out No en
dc.thesis.opt-out false
dc.check.entireThesis Entire Thesis Restricted
dc.check.embargoformat Both hard copy thesis and e-thesis en
ucc.workflow.supervisor k.cronin@ucc.ie
dc.internal.conferring Summer 2017 en


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