Preparation of water-in-oil emulsions using membrane emulsification system and high-speed homogenizer
2012
Ilić, Jelena D. (Faculty of Technology, Novi Sad (Serbia)) | Nikolovski, Branislava G. (Faculty of Technology, Novi Sad (Serbia)) | Sovilj, Milan N. (Faculty of Technology, Novi Sad (Serbia)) | Nikolić, Milan P. (Faculty of Technology, Novi Sad (Serbia)) | Marković, Jelena Đ. (Faculty of Technology, Novi Sad (Serbia))
Water-in-oil emulsions, consisting of demineralized water dispersed in sunflower oil and stabilized with polyglycerol polyricinoleate, have been prepared by using two emulsification methods: high-speed homogenizer and ceramic membranes (alphaaluminum oxide), with mean pore size 20 nm. Influences of the water phase content on the mean droplet size and droplet size distribution were investigated. The mean droplet size and droplet size distribution of the prepared emulsions were measured using a laser light scattering instrument. As expected, the results showed that the mean droplet size and droplet size distribution depended on the dispersed phase content in the emulsion in a way that increasing the water phase content the mean droplet size was increased. The results showed that application of membrane emulsification process can significantly reduce mean size diameter of water droplets in emulsions of this type. However, when membrane emulsification is used, the small water droplets, which were initially of the diameters less than 100 nm, tend to reduce the total amount of interface by coalescence, and form the droplets of the mean peak diameter of about 400 nm. At the same emulsifier content in the continuous phase (3%, w/w), the mean droplet diameter was about 750 nm in emulsions produced using high-speed homogenizer.
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