Optimization of Process on Extracting Flavonoids from Dry Onion Skins by Alkaline Method

Guoqing Shi, Xiang Qisen, Yichao Fan, Zhao Wenen, Li Yanqi
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引用次数: 1

Abstract

The flavonoids in dry onion skins were extracted by alkaline solution method. On the basis of single factor combined with ternary quadratic regression general rotary unitized design, the effects of several extraction parameters on the extraction efficiency of total flavonoids were investigated, including extraction times, pH of the extraction solution, material / extraction solution ratio, extraction time, and temperature. NaNO2-Al(NO3)3-NaOH method was used for the determination of total flavonoids. The optimal extraction conditions were as follows: two times of extraction; pH, 11; material / extraction solution ratio, 30 : 1; extraction temperature, 83.0 ~ 84.0 ℃; extraction duration, 1.9 ~ 2.0 h. Under the above optimal conditions, the flavonoids extracted from dry onion skins yielded 2.82%.
碱性法提取干洋葱皮黄酮工艺的优化
采用碱液法提取干洋葱皮中的黄酮类化合物。在单因素结合三元二次回归一般旋转一元设计的基础上,考察了提取次数、提取液pH、料液比、提取时间、温度等参数对总黄酮提取效率的影响。采用NaNO2-Al(NO3)3-NaOH法测定总黄酮含量。最佳提取工艺为:提取2次;pH值,11;料液比:30:1;萃取温度:83.0 ~ 84.0℃;提取时间为1.9 ~ 2.0 h。在此条件下,干洋葱皮总黄酮提取率为2.82%。
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