| Abstract [eng] |
In this Master's thesis project, different emulsion formulations were developed, differing in the amount of emulsifier and active component. Depending on the total amount of emulsion to be prepared, tea tree or lemongrass essential oils were chosen at 2,5 %, 5,0 % and 10 % and modified starch concentation was 20 %, 25 % and 30 %. The general characteristics of all formulations were determined: droplet size, polydispersity index, zeta potential, viscosity and pH. The stability of the emulsions was also evaluated visually as well in terms of the changes in droplet size of the emulsions when the samples were aged at different temperature, in addition sedimentation, creaming, and hydration indexes were determined. The results showed that the emulsion compositions with tea tree essential oil were more stable than the samples with lemongrass essential oil in terms of droplet size changes, while the samples with lemongrass essential oil were more stable in terms of visual assessment. Further investigations showed that emulsions with essential oils have an antioxidant effect. Emulsions were applied to the production of active paper using different preparation methods, such as moulding and impregnation. After the preparation of the active paper, FT-IR spectroscopy analysis, antioxidant properties and mechanical properties were determined. In the light of the results obtained, the production of active paper at industrial level has been proposed as a recommendation in this final master thesis. |
