Crystallization behavior of emulsified fats influences shear-induced partial coalescence. (November 2018)

• Record Type: Journal Article
• Authors: Moens, Kim; Tavernier, Iris; Dewettinck, Koen
• Is Part Of: Food research international. Volume 113(2018)
• Page Start: 362
• Page End: 370
• Publication Date: 2018-11
• Subjects: Milk fat -- Palm oil -- Palm kernel oil -- Partial coalescence -- Emulsion -- Fat crystallization -- Crystal morphology; Food -- Analysis -- Periodicals; Food industry and trade -- Periodicals; Food industry and trade -- Canada -- Periodicals; Food Technology -- Periodicals; Food -- Periodicals; Food-Processing Industry -- Periodicals; Aliments -- Industrie et commerce -- Périodiques; Aliments -- Industrie et commerce -- Canada -- Périodiques; Aliments -- Recherche -- Périodiques; Food industry and trade; Canada; Periodicals; Electronic journals; 664.005
• DOI: 10.1016/j.foodres.2018.07.005
• Languages: English
• ISSNs: 0963-9969

Abstract

Abstract: Emulsion stability is desired during production, storage and transportation. However, controlled destabilization by partial coalescence is requisite in the production of e.g. whipped cream, vegetable toppings and ice cream. Partial coalescence in recombined cream (RC) implies the presence of a semisolid fat. Three types of fat, i.e. anhydrous milk fat (AMF), palm oil (PO) and palm kernel oil (PKO), were used in the production of RC. Partial coalescence was initiated by the application of shear and assessed at three temperatures, namely 15, 20 and 25 °C to investigate the relation between solid fat content (SFC) and shear-induced partial coalescence. Despite differences in SFC, shear-induced partial coalescence occurred fastest at 20 °C. On the contrary, a nearly equal SFC at 25 °C resulted in significantly different behavior amongst the fats. This demonstrates that not only SFC determines instability but also fat crystal microstructure, which is dependent on fat composition and on processing conditions. However, SFC could be related to the type of network formed by the partially coalesced fat droplets. The fat crystallization properties, studied in bulk and emulsion, point out a divergent effect of emulsification on the crystallization of the fats which could be explained by differences in crystal morphology. Graphical abstract: Highlights: Crystal morphology is related to effect of emulsification on fat crystallization. Emulsification effects palm oil crystallization more than milk fat crystallization. Fat composition is related to shear-induced partial coalescence. Solid fat content is not the sole determining factor for partial coalescence.