Type

Journal Article

Authors

Donal J O'Callaghan
Alan L Kelly
James A O'Mahony
Grace M Kelly

Subjects

Chemistry

Topics
transition temperature infant formula surface water temperature effect whey protein surface morphology surface protein glass transition

Effect of hydrolyzed whey protein on surface morphology, water sorption, and glass transition temperature of a model infant formula. (2015)

Abstract Physical properties of spray-dried dairy powders depend on their composition and physical characteristics. This study investigated the effect of hydrolyzed whey protein on the microstructure and physical stability of dried model infant formula. Model infant formulas were produced containing either intact (DH 0) or hydrolyzed (DH 12) whey protein, where DH=degree of hydrolysis (%). Before spray drying, apparent viscosities of liquid feeds (at 55°C) at a shear rate of 500 s(-1) were 3.02 and 3.85 mPa·s for intact and hydrolyzed infant formulas, respectively. On reconstitution, powders with hydrolyzed whey protein had a significantly higher fat globule size and lower emulsion stability than intact whey protein powder. Lactose crystallization in powders occurred at higher relative humidity for hydrolyzed formula. The Guggenheim-Anderson-de Boer equation, fitted to sorption isotherms, showed increased monolayer moisture when intact protein was present. As expected, glass transition decreased significantly with increasing water content. Partial hydrolysis of whey protein in model infant formula resulted in altered powder particle surface morphology, lactose crystallization properties, and storage stability.
Collections Ireland -> Teagasc -> PubMed

Full list of authors on original publication

Donal J O'Callaghan, Alan L Kelly, James A O'Mahony, Grace M Kelly

Experts in our system

2
Alan L. Kelly
Teagasc
Total Publications: 63
 
3
James A. O'Mahony
Teagasc
Total Publications: 34