RHEOLOGICAL PROPERTIES AND OILINESS OF MONODISPERSED EMULSION GEL

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Effects oil droplets in an agar gel matrix were investigated by mechanical analysis and sensory evaluation. The stability and uniformity of monodispersed o/w emulsion with mean droplet diameter of 1.5, 3.3, 6.5 and 12.2 mum were confirmed during successive stages of gel preparation. Effects of oil droplets in an agar gel matrix were investigated by mechanical analysis under large and small-deformations. Under large deformation, the effects of oil droplets on gel strength were examined by compressive and puncture test. Thc compressive strength of the emulsion gels decreased with both increases in oil droplet size and oil volume fraction, while the puncture strength of the emulsion gel did not change with an increase in oil droplet size. For small-deformation test, creep behaviors and dynamic vicoelastic properties of emulsion gels were evaluated. Both the determined values by small-deformation test for the emulsion gels were almost constant for increasing oil droplet size. Thus, to demonstrate effects of oil droplets on emulsion gel, compression measurements under large-deformation arc useful to discriminate the oil droplet size on the rheological properties of emulsion gel.Sensory evaluation for emulsion gels containing the oil droplets with mean droplet diameter of 1.5, 6.5 and 12.2 mum was performed by the paired comparison method. The evaluation panels were coin posed of 18 laboratory students. Results of sensory evaluation showed that the sample containing small oil droplets was harder than that with large oil droplets. And the large oil droplets sample was oilier than that with small oil droplets.