Conclusion
In the current study the effects of ultrasound conditions on the extraction efficiency and total rebaudioside A yield were investigated. We found using isopropanol was economically which have higher value (3561 mg/g) when we use power 360 W with sonication for 18 min. This study revealed the benefit of ultrasonic treatment on the particle size distribution and physicochemical properties of stevia rebaudiana bertoni leaves dispersions. It is that foods containing stevia extract could be treated with separan AP30 without any worry about color. Although, there is still a need for more research to understand the exact reasons for the different behaviours of color removal when considering the polymers differences.