INFLUENCE OF SELECTED ADDITIVES ON COLLOID STABILITY OF ALCOHOLIC EMULSION CREAMS
 
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Pol. J. Food Nutr. Sci. 2007;57(1):17–24
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ABSTRACT:
Alcoholic emulsion creams produced using hen’s egg yolks (Advocaats) are dense, sweet liqueurs that are characterised by specific sensoric traits satisfying a wide spectrum of consumers. Despite long tradition of liqueur production, the technology in use does not ensure their full uniformity, nor stability during long-term storage. The destabilization rate is determined by many factors, e.g. homogenization technique, temperature, aeration as well as the quantitative and qualitative composition of a solution. We demonstrated that enrichment of the creams with lecithin (0.3%) or sodium caseinate (0.2%) enabled the “full” five-month storage stability. Sodium caseinate addition caused a significant reduction in fat droplets size measured directly after homogenization, but did not inhibit the formation of larger agglomerates via droplets joining. It also resulted in the cream’s viscosity increase. Advocaats containing elevated lecithin rates were characterised by high resistance to coalescence regardless of the fact that their viscosity was similar to the control samples. Furthermore, the synergistic effect of lecithin and sodium caseinate on storage durability of alcoholic emulsion creams was observed. Samples enriched with both compounds simultaneously, were stable over the five-month storage period, with their lipid phase being more dispersed and the coalescence being slower than in the control. The dispersion to size below 20 µm prolonged the durability of the tested emulsions to a significant extent. The combined application of lecithin (0.1%) and sodium caseinate (0.1%) employed to improve cream stability during storage proved to be efficient in industrial scale samples. Moreover, it was found that pressure homogenization under industrial conditions caused higher (by about 20%) dispersion of lipid fraction in reference to a high-rotation laboratory homogenizer.