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dc.contributor.authorBuggy, Aoife K.*
dc.contributor.authorMcManus, Jennifer J.*
dc.contributor.authorBrodkorb, Andre*
dc.contributor.authorMcCarthy, Noel*
dc.contributor.authorFenelon, Mark A.*
dc.date.accessioned2017-10-16T14:20:32Z
dc.date.available2017-12-01T17:00:08Z
dc.date.issued22/11/2016
dc.identifier.citationBuggy, A. K., McManus, J. J., Brodkorb, A., Mc Carthy, N., & Fenelon, M. A. (2017). Stabilising effect of α-lactalbumin on concentrated infant milk formula emulsions heat treated pre- or post-homogenisation. Dairy Science & Technology, 96(6), 845-859. doi: 10.1007/s13594-016-0306-1en_GB
dc.identifier.urihttp://hdl.handle.net/11019/1525
dc.descriptionpeer-revieweden_GB
dc.description.abstractProtein type and/or heat treatment pre- or post-homogenisation can affect the physical stability of infant formulations during manufacture. Previous research has described the use of α-lactalbumin addition in infant formulae, but has not demonstrated the effect of heating pre- or post-emulsion formulation during processing. The objective of this study was to evaluate the effect of both of these parameters. Three batches of model 1st-stage infant formula containing differing whey protein ratios (60:40 whey: casein with α-lactalbumin content 12, 30 or 48% of total protein) were prepared. Each batch was split; one half receiving heat treatment pre-homogenisation and the second half homogenised and then heat treated. Emulsion stability was determined by size exclusion chromatography, SDS-PAGE, particle size and viscosity measurements. There was a significant (P < 0.05) reduction in the formation of large soluble aggregates upon increasing α-lac concentration in emulsions heat treated either before or after homogenisation. Heat treatment of formulations post-homogenisation resulted in a higher (P < 0.05) D.v09 within the particle size distribution; increasing α-lactalbumin concentration to 30 or 48% significantly (P < 0.05) reduced the D.v09 within the particle size distribution in these emulsions. The viscosity of concentrates (55 % total solids) containing the 12% α-lactalbumin, heat treated post-homogenisation, was significantly greater (P < 0.05) than the equivalent emulsion heat treated pre-homogenisation; increasing the α-lactalbumin concentration to 30 or 48% significantly (P < 0.05) reduced viscosity. When the α-lactalbumin content was increased to 48% as a percentage of the total protein, heating before or after emulsion formation had no effect on concentrate viscosity. The findings demonstrate the importance of thermal denaturation/aggregation of whey proteins (and in particular, the ratio of α-lactalbumin to β-lactoglobulin) prior to homogenisation of infant formula emulsions.en_GB
dc.description.sponsorship
dc.language.isoenen_GB
dc.publisherSpringeren_GB
dc.relation.ispartofseriesDairy Science & Technology;vol 96
dc.subjectα-Lactalbuminen_GB
dc.subjectβ-Lactoglobulinen_GB
dc.subjectInfant milk formulaen_GB
dc.subjectEmulsion stabilityen_GB
dc.titleStabilising effect of α-lactalbumin on concentrated infant milk formula emulsions heat treated pre- or post-homogenisationen_GB
dc.typeArticleen_GB
dc.embargo.terms02/11/2017en_GB
dc.identifier.rmisMDDT-0103-6447
dc.identifier.doihttp://dx.doi.org/10.1007/s13594-016-0306-1
dc.contributor.sponsorDepartment of Agriculture, Food and the Marine
dc.contributor.sponsorTeagasc Walsh Fellowship Programme
dc.contributor.sponsorGrantNumber11/F/037
refterms.dateFOA2018-01-12T08:59:45Z


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