Abstract
Sunflower oil in water emulsions containing between 10–70% (w/w) oil and 1–15% (w/w) sorbitan monopalmitate (Span 40) and polyoxyethylene (20) sorbitan monopalmitate (Tween 40) in different ratios were prepared. Their rheological behavior was investigated by continuous shear rheometry and by creep viscometry. Emulsions containing ⩾5% (w/w) of Span Tween in weight ratios of 6 4 and 7 3 exhibited viscoelasticity. This was ascribed to the presence of a lamellar type of liquid crystalline phase in the systems which was confirmed by electron microscopy.
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