求翻译：本实验对南京雨花茶黄酮的提取工艺和总抗氧化活性进行了研究。通过对料液比、浸提温度、浸提时间和浸提浓度进行单因素试验和L9(33)正交试验，对雨花茶中黄铜提取工艺进行优化。结果表明：南京雨花茶总黄酮最佳提取工艺为乙醇浓度为70%，料液比为1：30，时间为2h，温度为8O℃ 。根据最佳提取工艺，重复3次得到总黄酮量分别11.2%、11.4%、11.3% (mg／mg)，具有稳定性和可操作性；另外，衡量南京雨花茶总黄酮提取物抗氧化活性，其DPPH ·自由基的清除能力优于抗坏血酸。是什么意思？

In this study, Nanjing rain tea flavonoids extraction technology and total antioxidant activity were studied. Liquid ratio, extraction temperature, extraction time and extraction concentration of single-factor test and l9 (33) orthogonal test to optimize the rain tea brass extraction process. The re

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