Effect of pH, ionic strength, temperature and sugar concentration on orange peel essential oil/ T60: propanol and water microemulsion zone using Response Surface Methodology

Document Type : Research Article-en

Authors

• Sedigheh Amiri ¹
• Soleiman Abbasi ²
• Hamid Ezzatpanah ³

¹ Young Researchers and Elite Club, Yasooj Branch, Islamic Azad University, Yasooj, Iran; Department of Food Science and Technology, Yasooj Branch, Islamic Azad University, Yasooj, Iran.

² Food Colloids and Rheology Lab., Department of Food Science and Technology, Tarbiat Modares University, Iran.

³ Department of Food Science and Technology, Science and Research Branch, Islamic Azad University, Tehran, Iran.

https://doi.org/10.22067/ifstrj.v15i3.72039

Abstract

In this study, microemulsification of orange peel oil (OPO) using Tween 60:propanol with the ratio of 1:1 was studied under different conditions of pH, ionic strength, and sugar concentration.. Results showed that critical temperature (the temperature in which one- phase microemulsion system was still stable) for the microemulsions with higher sucrose concentrations (in the range between 0 to 30%) was lower while by decreasing in sugar concentration, critical temperature shifted to higher temperatures, as it reached to 90°C for the samples without sugar. The prepared microemulsions were stable at 5 and 25°C for seven days, but samples with higher concentrations of sugar (25 and 30%) became turbid at 45°C, whereas all other samples exhibited a one-phase microemulsion system at this temperature. Microemulsions were not stable at -3°C (freezing temperatures). In sensory evaluation, it was observed that the microemulsified OPO was dissolved in water as soon as it was added into the medium, in contrast to free essential oil as it was spreading on the surface of the solution. Encapsulation of OPO caused lower release of aroma, resulting a milder odor and taste (lower intensity) in samples which were preferred by the panelists. The overall acceptability of all samples containing OPO microemulsion was significantly higher than samples with free essential oil.

Keywords

• Microemulsion
• orange peel oil
• Response surface methodology
• Modeling

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