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Optimization of ultrasound-assisted extraction of natural colorant from Huyet Du leaves using ethanol solvent

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In this paper, the natural colorant from Vietnam Huyet du leaves were extracted by ultrasound-assisted extraction (UAE) technology using ethanol solutions. Three independent variables including extraction temperature (30-70 °C), ethanol concentration (5-95%) and sonication time (5-45 min) were investigated. | Optimization of ultrasound-assisted extraction of natural colorant from Huyet Du leaves using ethanol solvent