亚临界水法提取新鲜紫薯中花色苷

摘要

Using extraction rate of anthocyanins as index,the natural pigment anthocyanins in fresh purple sweet potato was extracted by sub-critical water extraction method.Through the single factor experiment and the orthogonal experiment,the optimum extraction conditions were obtained as follows:extraction temperature of 115 ℃,extraction time of 13 min,liquid-material ratio of 8∶1(mL∶g),pH value of 3.0.Under above condi-tions,the extraction rate reached 0.139 mg·g-1 .Compared with water extraction method,the color value of anthocyanins extracted by sub-critical water extraction method increased by 6.2%,and the extraction time shorten by nearly five-fold.%以花色苷提取率为考察指标，采用亚临界水提取新鲜紫薯中天然色素花色苷。通过单因素实验和正交实验确定最优提取条件为：提取温度115℃、提取时间13 min、液料比8∶1（mL∶g）、pH 值3.0，在此条件下，新鲜紫薯中花色苷的提取率最高可以达到0.139 mg·g－1，与水提法相比，提取时间缩短了近5倍，产品色价提高了6.2％。