Abstract
The objective was to analyze the microstructure, stability, and rheology of model emulsions prepared with distilled water, refined sunflower oil, and different Spans (20, 40, 60, and 80) as emulsifiers. The effects of the water content and Span 60 concentration were studied. The lowest water contents led to w/o emulsions, whereas higher percentages gave w/o/w emulsions. Microscopy analysis showed that w/o/w emulsions of higher water contents had a lower number of internal water droplets. W/o emulsions were destabilized by coalescence and sedimentation, whereas creaming was observed in unstable w/o/w emulsions. In the last ones, the creaming stability decreased with increasing water content and enhanced with higher Span 60 concentration; the same effect was observed in their viscoelasticity: They were from unstable liquids to stable gels. Solid Spans (40 and 60) produced more consistent w/o/w emulsions at low water contents and more stable systems at high water percentages in comparison with liquid Spans (20 and 80).
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References
Peltonen L, Hirvonen J, Yliruusi J (2001) J Colloid Interface Sci 239:134
Peltonen L, Hirvonen J, Yliruusi J (2001) J Colloid Interface Sci 240:272
Berg T, Arlt P, Brummerc R, Emeis D, Kulicke WM, Wiesner S, Wittern KP (2004) Colloids Surf A: Physicochem Eng Asp 238:59
Matsumoto S, Kang WW (1989) J Dispers Sci Technol 10:455
Dickinson E, McClements DJ (1995) Advances in food colloids, 1st edn. Blackie, Glasgow
Hou W, Papadopoulos KD (1996) Chem Eng Sci 51(22):5043
Hou W, Papadopoulos KD (1997) Colloids Surf A: Physicochem Eng Asp 125:181
Opawale FO, Burgess DJ (1998) J Colloid Interface Sci 197:142
Song MG, Jho SH, Kim JY, Kim JD (2000) J Colloid Interface Sci 230:213
Porras M, Solans C, González C, Martínez A, Guinart A, Gutiérrez JM (2004) Colloids Surf A: Physicochem Eng Asp 249:115
Walstra P (1983) Formation of emulsion. In: Becher P (ed) Encyclopedia of emulsion technology: basic theory. Marcel Dekker, New York, pp 57–127
Pan LG, Tomás MC, Añon MC (2002) J Surf Det 5:135
Márquez AL, Palazolo GG, Wagner JR (2005) Grasas y Aceites 56(1):59
Palazolo GG, Sorgentini DA, Wagner JR (2004) J Am Oil Chem Soc 81(7):625
McClements DJ (1999) Food emulsions: principles, practice and techniques. CRC, New York
Acknowledgments
The authors acknowledge the financial support from the Agencia Nacional de Promoción Científica y Tecnológica (FONCyT, PICT 2002 09–10768), Universidad Nacional de La Plata, and wish to thank Refinerías de Maíz S.A.I.C.F. (Unilever Bestfoods Argentina, Pilar, Provincia de Buenos Aires) for kindly providing us with the Malvern Mastersizer Micro Particle Analyzer.
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Márquez, A.L., Palazolo, G.G. & Wagner, J.R. Water in oil (w/o) and double (w/o/w) emulsions prepared with spans: microstructure, stability, and rheology. Colloid Polym Sci 285, 1119–1128 (2007). https://doi.org/10.1007/s00396-007-1663-3
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DOI: https://doi.org/10.1007/s00396-007-1663-3