摘要
采用超声辅助法提取黑菊芋中多酚化合物,选择乙醇体积分数、提取温度、提取时间及料液比4个因素进行单因素实验,并采用正交试验优化提取工艺,确定了黑菊芋总多酚超声提取的较优条件为乙醇体积分数55%、料液比(g/mL) 1:35、温度85℃、时间45 min,此条件下的提取率为6. 26 mg/g。利用此工艺条件提取菊芋多酚,检测结果以干基计算,鲜菊芋的菊芋多酚质量比为1. 13 mg/g,黑菊芋的为6. 41 mg/g,是鲜菊芋的5. 67倍。体外抗氧化实验结果表明,黑菊芋各抗氧化指标均与多酚含量具有较好的相关性,其中还原力相关性最高为0. 994 6。不同作用量时,黑菊芋对DPPH.自由基、羟自由基的清除率和铁离子还原力均显著高于鲜菊芋,分别为同质量鲜菊芋(干重计)的1.08~1.54倍,1.02~1.28倍和2. 56~3. 98倍。
The orthogonal experiment was used to determine the optimization extraction condition of polyphenols from black and fresh Jerusalem artichoke. The optimal conditions were ethanol concentration55%, the material solvent ratio 1: 35 g/mL,temperature 85℃,and time 45 min. Under this condition,the polyphenols extraction yield of black Jerusalem artichoke was 6. 41 mg/g while the extraction yield of fresh Jerusalem artichoke was 1. 13 mg/g. The results also showed that the antioxidant activities had relevance with polyphenols contents and a positive correlation between polyphenols contents and ferric reducing antioxidant power was obtained(R = 0. 994 6). Polyphenols from black Jerusalem artichoke had higher DPPH scavenging ability,hydroxyl radical scavenging ability,and ferric reducing antioxidant power,which were 1. 08 ~1. 54 times,1. 02 ~1. 28 times,and 2. 56 ~3. 98 times higher than fresh Jerusalem artichoke.
引文
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