响应面复合酶法提取紫薯多糖及抗氧化活性研究Study on Extraction of Polysaccharides from Purple Sweet Potato by Response Surface and Compound Enzymatic Methods and the Antioxidant Activity
徐丽梅,陈炼红
摘要(Abstract):
为确定复合酶法提取紫薯多糖的最佳工艺及其抗氧化活性,以新鲜紫薯为原料,设计复合酶法多糖提取工艺单因素试验,并依据Plackett-Burman试验设计原理,分析每个因素的显著性,筛选关键因素,再利用Box-Behnken中心组合进行响应面分析,确定最优工艺。通过测定紫薯多糖对羟基自由基(·OH)、超氧阴离子自由基(O_2~-·)和1,1-二苯基-2-苦肼基(DPPH·)的清除能力评价其抗氧化活性。结果表明,复合酶法提取紫薯多糖的最佳工艺参数为液料比31∶1(mL/g),酶解时间95 min,复合酶添加量4%,酶解温度44℃,多糖得率为2.759%。最优提取工艺条件下紫薯多糖对·OH、DPPH·、O_2~-·的清除能力明显,且紫薯多糖浓度越高,清除率越大,虽然清除能力较抗坏血酸低,但紫薯多糖具有一定的抗氧化活性,有益身体健康。
关键词(KeyWords): 紫薯多糖;复合酶法;Plackett-Burman试验设计;响应面法;抗氧化性
基金项目(Foundation): 西南民族大学研究生创新型科研项目(CX2021SP135)
作者(Author): 徐丽梅,陈炼红
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