In this study,an orthogonal experiment was performed to explore the optimal extraction technique of water-soluble polysaccharides from pumpkin.Moreover,the polysaccharides＇ capabilities to scavenge ·OH and DPPH· and their gross reducing power was measured with Vc and BHT as references.In the orthogonal experiment,various factors including temperature,extraction time,solid-liquid ratio,were optimized.The results showed that the polysaccharides extracted from pumpkin are endowed with strong in vitro antioxidant properties.Our study provided references for the extraction of pumpkin polysaccharides and for their use as antioxidants.
[目的]优化复合酶法提取南瓜多糖的工艺条件,研究南瓜多糖的抗氧化性。[方法]采用单因素试验设计研究了不同提取时间、温度、料液比、pH值对南瓜多糖提取率的影响,并通过正交试验确定了提取南瓜多糖的最佳复合酶配比和最佳提取条件。采用水杨酸法检测南瓜多糖对羟基自由基(.OH)和改进的邻苯酚自氧化法检测其对超氧阴离子自由基(O-2)的清除效果。[结果]当纤维素酶的浓度为1.0%、果胶酶为1.5%、木瓜蛋白酶为1.0%时,以及温度为40℃、pH=4.6、料液比为1∶30、提取时间为30 m in的条件下南瓜多糖的提取率最高;南瓜多糖对.OH具有较好的清除效果,对O-2有部分清除作用。[结论]该研究为南瓜多糖的研究及应用提供了基础资料。
