Ultrasonic assisted extraction of yellow pigment from flavedo of grapefruit

The ultrasonic cavitation and the response surface methodology were used to optimize the extraction process of the yellow pigment from flavedo of grapefruit, and a mathematical model of extraction time, solid- liquid ratio and ethanol concentration on the extraction of yellow pigment was established to obtain the optimal extraction process.The results showed that the effects of solid- liquid ratio and ethanol concentration on the absorbance of yellow pigment extract solution were significant, and the optimal extraction process was extraction time of 30 min, solid- liquid ratio of 1 ∶ 33 g / m L and ethanol concentration of 51%, under which the absorbance of yellow pigment extract solution was 1.778 ( n = 3) and there was no significant difference between prediction value.