紫甘薯花色苷色素提取方法的研究

Different Extraction Method of Pigment from Purple Sweet Potato

以紫甘薯全粉为原料,研究溶剂浸提法、微波萃取法和超声波萃取法对紫甘薯花色苷色素提取效果的影响。结果表明:溶剂浸提法产率较低,提取时间较长;超声波萃取法产率较高,但色素纯度较低;微波萃取法是一种较好的提取方法:以0.5%柠檬酸水溶液为提取剂,pH2.5,微波辐射功率900W,料液比1:70,提取时间2min,提取2次,产率达5.94%,色价为8.7。其产率是溶剂浸提法的1.24倍,超声波萃取法的1.04倍;其色价是溶剂浸提法的1.12倍,是超声波萃取法的1.16倍。

With the purple sweet potatoes as raw material, the effects of extracting pigment from purple sweet potato by solvent, microwave and ultrasonic wave were studied. The results indicated that the extracting rate of solvent extraction was low, and the time was long. The extracting rate of ultrasonic wave extraction was high, but the purity of pigment was low. However, microwave extraction was a good method. With the parameters of 0.5% citric acid, the value of pH 2.5, microwave power 900 W, the proportion of materials and solvents 1：70, extracting time for 2 min and two times, the extracting rate reached 5.94%, the color value was 8.7. The yield of microwave extraction is solvent extraction of 1.24 times, and it is ultrasonic wave extraction of 1.04 times. Then the color value of microwave extraction is solvent extraction of 1.12 times, and it is ultrasonic extraction of 1.16 times.