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Doctor of Philosophy, (Food Technology)
Study Completed: 2013
College of Health
Properties of oil-in-water emulsions and ice creams made from coconut milk
Coconut milk is a natural oil-in-water emulsion extracted from the endosperm of fresh mature coconut fruit. Coconut milk is unstable, readily separating into two phases, cream and serum, after its extraction and also even after homogenisation. Mr Chalermnon investigated the properties of coconut milk emulsions stabilised by different fractions of coconut milk proteins. The unstable nature of coconut oil emulsions in coconut milk was found to be due mainly to a type of coconut milk proteins, which is globulins (salt soluble), adsorbed on the surface of coconut oil droplets. Coconut oil emulsions stabilised with coconut albumins (water soluble protein) were more stable to creaming and phase separation. Coconut milk emulsions containing a mixture of coconut oil (solid) and sunflower oil (liquid) at different ratios, which were stabilised by two types of proteins (globulins and albumins), were also prepared and used in making ice creams to investigate their effects on the properties of coconut milk ice creams. Results show that there is a significant difference in the textural (firmness and viscosity) and melting properties of ice creams as well as the amount of air incorporated (overrun), depending on the types of proteins and oil blends used.
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Last updated on Tuesday 04 April 2017