Abstract
Changes in the techno-functional properties of hen's egg yolk main fractions, granules and plasma, were studied under various spray-drying conditions and enzymatic modification via phospholipase A2 (PLA2). The functional properties—for example gelling properties—of plasma fractions were maintained in a more or less native status if an enzymatic modification was done before spray drying. Furthermore, PLA2 preprocessing significantly improved the surface activity of dried plasma fractions. Without enzymatic treatment, spray-dried plasma fractions showed an intense loss of surface activity and gelling properties due to a heat-induced denaturation and aggregation of plasma livetins and low-density lipoprotein (LDL) apoproteins. In contrast, high air outlet temperatures during spray drying resulted in a significant increase in the gelling ability of reconstituted granules. Additionally, PLA2-modified granules showed considerably improved solubility and surface activity after spray drying compared to non-enzymatically modified granules.
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