Abstract
In this study, ultrasound-assisted extraction (UAE) of natural pigment extraction from waste red beet stalks were optimized under four factors (extraction temperature, ultrasonic power, extraction time and solid-liquid ratio) by using three level Box-Behnken response surface design. Extraction temperature, ultrasonic power and solid-liquid ratio were significantly influenced the extraction yield of pigments. Extraction temperature of 53°C, ultrasonic power of 89w, extraction time of 35min and SL ratio of 1:19g/ml was identified as the optimal condition. Under this condition, the actual yield of (betacyanin of 1.28 ± 0.02 and betaxanthin of 5.31 ± 0.09mg/g) pigments was well correlated with predicted values (betacyanin was 1.29mg/g and betaxanthin was 5.32mg/g).
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