对核桃青皮中天然色素的提取不仅能开发其应用价值，还能减少对环境的污染． 核桃青皮色素的主要成分是单宁，采用微波辅助乙醇法提取核桃青皮中的单宁． 首先研究 了料液比、乙醇体积分数、提取反应温度、提取反应时间、微波功率对单宁提取率的影响， 然后通过响应面法优化对提取工艺进行优化，优化得到的最佳工艺条件为: 乙醇体积分数 45% 、料液比 1∶ 20 ( g /mL) 、反应温度 61 ℃、微波功率 612 W、反应时间 10 min，此条件下 核桃青皮中单宁提取率为 20. 36 mg /g． 研究结果为核桃青皮中单宁的提取提供基础数据 和理论指导．

The extraction of natural pigments from walnut green husks can not only develop its application value but also reduce the environmental pollution． The main component of walnut green husk pigment is tannins． The tannins in walnut green husk are extracted by microwave-assisted ethanol extraction． Firstly，this article studies the effects of solid-liquid ratio，ethanol volume fraction，extraction temperature，extraction time and microwave power on the extraction yield of tannins，and then optimizes the extraction process by response surface methodology ( ＲSM) ． The optimal conditions are: ethanol volume fraction of 45% ，solid-liquid ratio of 1∶ 20 ( g /mL) ，temperature of 61℃，microwave power of 612 W，and a time of 10 min． Under these conditions，the extraction yield of tannins in walnut green husk is 20. 36 mg /g． The results provides the basic data and theoretical guidance for the extraction of tannins from walnut green husk