研究不同干燥方法(阴干、晒干、鼓风干燥、微波干燥、冷冻干燥)对荷花花瓣抗氧化活性和总黄酮、总酚、花青素含量的影响。以抗坏血酸作为阳性对照,采用还原能力、DPPH自由基清除和羟基自由基清除3种体外抗氧化模型,评价了不同干燥方式处理的荷花花瓣的抗氧化能力,并对总黄酮、总酚和花青素的含量进行了测定。结果表明:荷花花瓣具有较强的还原能力、清除DPPH自由基和羟基自由基的能力;不同干燥方法对荷花花瓣的抗氧化活性和活性物质的含量均有较大的影响,其中冷冻干燥的荷花花瓣抗氧活性能力最强,且总黄酮、总酚和花青素的含量最高,分别为60.20、85.35 mg/g和150.3 ng/g;而晒干荷花花瓣的抗氧化能力最差,黄酮、总酚和花青素的含量最低,分别为0.39、19.08 mg/g和2.8 ng/g。

the effect of different drying methods(shade-drying,sun-drying,hot-air drying,microwave-drying and freeze-drying) on the antioxidant activity and chemical composition of Nelumbo nucifera was studied.Compared with ascorbic acid,antioxidant activity of Nelumbo nucifera dried by different methods was measured and evaluated by reducing power,DPPH radical scavenging and hydroxyl radical scavenging three in vitro models.The content of flavonoid,total phenolic and anthocyanin were also determined.The results indicated that the extract of Nelumbo nucifera had remarkable abilities in reducing power,scavenging DPPH radical and hydroxyl radical;Antioxidant activity and the contents of active components showed significant differences among different drying methods.Freeze drying showed the best results on antioxidant activity and the content of flavonoid,total phenolic and anthocyanin at 60.20 mg/g,85.35 mg/g and 15.03 μg/100g respectively.Sun-drying was the worst in antioxidant activity and the content of flavonoid,total phenolic and anthocyanin was 0.39 mg/g,19.08 mg/g and 0.28 μg/100 g respectively.The study effectively evaluated the effects of different drying methods on antioxidant activity and chemical composition of Nelumbo nucifera.