Abstract: To optimize the extraction process of phlorizin from litchi pericarp and assess its antioxidant activity，we enhanced the extraction efficiency by optimizing several parameters，including the solid⁃liquid ratio，solvent concentration， extraction temperature，solvent pH，and extraction duration. The antioxidant activity of phlorizin was analyzed using the DPPH and ABTS radical scavenging assays. Single⁃factor experimental results indicated the following extraction rates：a solid⁃liquid ratio of 1∶40 yielded 1.22% phlorizin，a 65% ethanol solution resulted in 1.20%，a water bath temperature of 60 ℃ produced 1.51%，and a solvent pH of 5 achieved 1.58%. After an extraction time of 60 min，the yield of phlorizin reached 1.39%. The optimized extraction conditions included a solid􀆼liquid ratio of 1∶40，65% ethanol concentration，60 ℃ temperature，pH 5，and a 60􀆼minute extraction time. These conditions yielded the extraction rate of phlorizin from litchi shell ranged between 1.16% and 1.39%. The antioxidant activity of the extracts demonstrated that the antioxidant capacity （TEAC value）of the phlorizin extract was 0.34 μg TE/μg，with a total antioxidant capacity of（4.02±1.08）mmol/g. These findings provide a scientific basis for developing antioxidant preparations derived from litchi shell.

Key words: Litchi shell, Phlorizin, Extraction process, Antioxidant activity

摘要： 为优化荔枝壳中根皮苷的提取工艺并分析根皮苷提取物的抗氧化活性，该研究通过 优化料液比、溶剂浓度、提取温度、溶剂pH值和提取时间等单因素条件，以提高从荔枝壳中提取 根皮苷的效率，并采用DPPH法和ABTS法分析所提取根皮苷的抗氧化活性。单因素分析试验 结果表明，以1∶40料液比提取根皮苷得率为1.22%，以65%乙醇溶液提取根皮苷得率为1.20%， 在提取温度为60 ℃条件下提取根皮苷得率为1.51%，以溶剂（pH 5）提取根皮苷得率为1.58%， 当提取时间为60 min时根皮苷的得率为1.39%。优化所得提取工艺条件为：料液比1∶40，乙醇 浓度65%，提取温度60 ℃，溶剂pH值5，提取时间60 min，在此条件下荔枝壳根皮苷提取率为 1.16%—1.39%。检测提取物的抗氧化活性发现，根皮苷提取物的抗氧化能力（TEAC值）为0.34 μg TE/μg，总抗氧化能力为（4.02±1.08）mmol/g，表明从荔枝壳中提取的根皮苷具有较好的抗氧 化活性，为开发荔枝壳来源的抗氧化制剂提供理论依据。

关键词: 荔枝壳, 根皮苷, 提取工艺, 抗氧化活性