Emulsification by high frequency ultrasound using piezoelectric transducer: Formation and stability of emulsifier free emulsion

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• 作者：Messaouda Kaci ; Smail Meziani ; Elmira Arab-Tehrany ; Guillaume Gillet ; Isabelle Desjardins-Lavisse ; Stephane Desobry
• 关键词：Emulsifier free emulsion ; High frequency ultrasound ; Particle size ; pH ; Electrophoretic mobility ; Conductivity
• 刊名：Ultrasonics Sonochemistry
• 出版年：May, 2014
• 年：2014
• 卷：21
• 期：3
• 页码：1010-1017
• 全文大小：1191 K

文摘

Emulsifier free emulsion was developed with a new patented technique for food and cosmetic applications. This emulsification process dispersed oil droplets in water without any emulsifier. Emulsions were prepared with different vegetable oil ratios 5%, 10% and 15% (v/v) using high frequency ultrasounds generated by piezoelectric ceramic transducer vibrating at 1.7 MHz. The emulsion was prepared with various emulsification times between 0 and 10 h. Oil droplets size was measured by laser granulometry. The pH variation was monitored; electrophoretic mobility and conductivity variation were measured using Z锚tasizer equipment during emulsification process. The results revealed that oil droplets average size decreased significantly (p < 0.05) during the first 6 h of emulsification process and that from 160 to 1 渭m for emulsions with 5%, 10% and from 400 to 29 渭m for emulsion with 15% of initial oil ratio.

For all tested oil ratios, pH measurement showed significant decrease and negative electrophoretic mobility showed the accumulation of OH^{鈭?/sup> at oil/water interface leading to droplets stability in the emulsion. The conductivity of emulsions showed a decrease of the ions quantity in solution, which indicated formation of positive charge layer around OH鈭?/sup> structure. They constitute a double ionic layer around oil particles providing emulsion stability. This study showed a strong correlation between turbidity measurement and proportion of emulsified oil.}