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Effect of Small Change in Oil Phase Composition on Rheological and Textural Properties of w/o Emulsion

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4Corresponding author. TEL: +381-113951356; FAX: +381-113974349; EMAIL: mlukic@pharmacy.bg.ac.rs

Abstract

In this work, we have modified oil phase composition in one component (mineral oil, isocetyl palmitate, special Olive butter and dimethicone 200/350) and the aim of our work was to establish the influence of that alteration on emulsion rheological and textural properties. Additionally, continuous and oscillatory rheological measurements along with texture analysis were assessed in order to predict emulsion application behavior. Based on the obtained results, the change of oil phase has induced a change in the observed rheological and textural parameters and investigated samples can be divided into two distinct groups: the first group – samples with special Olive butter and dimethicone 200/350 and the second group – samples with isocetyl palmitate and mineral oil. Results confirmed that instrumental measurements, as sensitive tools, can be used in order to differentiate emulsions regarding textural properties and especially regarding their actual usage and sensory properties.

Practical Applications

It is a known fact that the structure of semisolid systems can be characterized by various rheological and textural parameters that are also apt to define certain sensory attributes. Sensory attributes dependent on structure characteristics and flow properties, used for the description of the product in pickup and rub-out phase, could be predicted by instrumental, i.e., rheological and textural measurements. Expensive and time-consuming studies performed with human panelists could be, at least to some extent, replaced with simple rheological and textural measurements. These findings could also contribute to the faster and easier introduction of new raw materials, regarding their characterization and prediction of their influence on the final product characteristics. A combined approach like this could be helpful as both time and money-saving tool for full characterization of a novel consumer-acceptable emulsion product.

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