A Study Of The Relation Between Ice Formation And Swell Development In Freezing Ice Cream

Author : Inggrayani Herlambang
Publisher :
ISBN 13 :
Total Pages : 242 pages
Book Rating : 4.:/5 (212 download)

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Download or read book Effect of Stabilizers on Fat Agglomeration in Ice Cream During Freezing written by Inggrayani Herlambang and published by . This book was released on 2007 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Fat agglomeration has been widely known to contribute in the development of ice cream structure. this results from partial coalescence of fat globules induced by shear forces of agitation and ice crystallization during ice cream manufacturing. Preliminary study of commercial ice cream revealed that stabilizers help fat agglomeration. ice cream without any stabilizer had no cumulative % particle > 10 um, which means no fat agglomeration. the choice of emulsifier also affected the extent of fat agglomeration. in general, ice cream with egg yolks as emulsifier had lower amount of fat agglomerates than ice cream with mono- and di-glycerides as emulsifiers. To investigate the role of stabilizers and emulsifiers in more detail, ice cream mixes were prepared with a composition of 10% milk fat, 10% milk solids-not-fat (MSNF), 12% sucrose, 6% corn syrup solids (CSS) and 0.15% mono and di-glycerides (MDG). Three different gums, locust bean gum (LBG), carrageenan (Carr), and carboxy methyl cellulose (CMC), were used either singly or in combination at concentration of 0.15%, except Carr, which was added at 0.02%. The aim of this research was to examine the effects of different type of stabilizers on fat agglomeration during freezing in the presence and absence of emulsifiers. another objective of the study was to understand the influence of stabilizer on the melting resistance of ice cream. integrated light scattering with Malvern Mastersizer was used to obtain fat globules distribution and fat agglomeration. D[4,3] and cumulative % particle greater than 10 um were used to indicate fat agglomeration. Melting resistance of ice cream was examined by conducting meltdown test at ambient temperature. Dripped loss, the mass of ice cream pass through the screen, was measured as a function of time. The melting rate was calculated from the linear portion of the melting curve. Results of this study showed that choice of stabilizers influences the amount of fat aggregates formed during freezing. Ice cream with added stabiliers and/or emulsifiers showed higher extent of fat agglomeration as compared to ice cream without any stabilizers and emulsifiers. Different stabilizer gave different degree of fat agglomeration. Generally, the use of emulsifier together with stabilizer enhanced the fat agglomeration. Combination stabilizers had more effects on fat agglomeration as compared to single stabilizers because of the synergistic effect of stabilizers. Ice cream with LBG and Carr (in combination) had the highest amount of fat aggregates followed by CMC>LBG+Carr+CMC+MDG. For those with a lesser affect on fat aggregation in the ice cream, the effect was neither MDG nor stabilizer >Carr>CMC+LBG. Generally, there was less fat aggregation but more melting resistance when stabilizers were combined with emulsifier. There was no correlation between fat agglomeration and melting rate of ice creams. Overall, the studies demonstrated that stabilizers promote fat agglomeration during freezing. Further studies on ice cream structure are needed to understand the interaction of these stabilizers in the ice cream matrix.