This study investigated the use of liquid biphasic flotation (LBF) which composed of alcohol and salt for betacyanins extraction from peel and flesh of red-purple pitaya (Hylocereus polyrhizus). Betacyanins have received a great deal of research attention owing to their promising antioxidant activity. The operating parameters of LBF, including types/concentrations/volumes of alcohol and salt, addition of sodium chloride, flotation time and types/concentrations of crude extract, were adopted for the betacyanins extraction. Overall, the highest values of betacyanins concentration in alcohol-rich top phase (C_t), separation efficiency (E) and partition coefficient (K) of betacyanins that reveal a maximum betacyanins extraction from the peel (95.989%, 88.361% and 24.168, respectively) and flesh (95.488%, 94.886% and 21.195, respectively) were successfully achieved with LBF. In addition, both the peel and flesh extracts of red-purple pitaya provided different hues and intensities of red color, and their antioxidant properties were well retained.

这项研究调查了由酒精和盐组成的液体双相浮选（LBF）用于从红紫色火龙果（Hylocereus polyrhizus）的果皮和果肉中提取花青素的用途。由于花青素具有良好的抗氧化活性，因此倍受青睐。β氰菊酯的提取采用LBF的操作参数，包括醇和盐的类型/浓度/体积，氯化钠的添加量，浮选时间和粗提物的类型/浓度。总体而言，富含酒精的上层相（C _t），成功地揭示了从果皮（分别为95.989％，88.361％和24.168）和果肉（分别为95.488％，94.886％和21.195）中提取最大的花青素的甜菜青素的分离效率（E）和分配系数（K）成功用LBF实现。另外，红紫色火龙果的果皮和果肉提取物均提供不同的红色色调和强度，并且它们的抗氧化性能得到了很好的保留。