【摘要】 采用有机溶剂浸泡法和超声波辅助技术从黑米中提取色素,利用正交实验,对不同温度、不同时间下的色素提取率进行测定,以确定最佳提取条件,比较两者的提取效率。结果表明:超声波作用下提取黑米色素能够缩短提取时间、降低提取温度。最佳提取工艺条件为:提取剂为无水乙醇,料液比(每克所用溶剂的体积)8mL,提取温度60℃,提取时间5min,超声波功率70W。色素在酸性条件下相对稳定,且蔗糖有助于其稳定性。光照、加热、金属离子对色素的影响不大。更多还原

【Abstract】 The pigment of black rice was extracted with organic solvent and ultrasonic. The extractive rate at different temperatures and time was testified in order to optimize extractive conditions by orthogonal design. The optimum extraction condition of under ultrasonic was determined as follows:the extractant CH3CH2OH,the amount of the solvent(per 1.0g black rice)8mL,extraction temperature 60℃,extraction time 5min,ultrasonic power 70W. The study on black rice pigments showed the pigment was relatively stable in the acidic solution and sucrose was advantageous in its stability. Light,heat and metal ions had little impact on its stability.更多还原