Chestnut (Castanea sativa) burs is an underutilized solid by-product generated during the harvesting and processing of the edible fruit that could be used as a source of bioactive compounds in a context of circular economy concept. Supercritical CO₂ extraction of chestnut burs was performed for the first time in this work. Supercritical extraction experiments were carried out in the ranges 10-30 MPa, 35-70 °C, 10-35 g CO₂/min and different amounts of ethanol as polar modifier in order to evaluate the effect of the processing parameters in the extraction yield and antioxidant activity of the extracts. An overall extraction curve was measured at 25 MPa and 45 °C with 10 % ethanol as modifier reaching a global yield of 2.5 % after 3 h of extraction. Additionally, four different mass transfer models were used to describe the kinetics, showing a good fit with the experimental data.

板栗（Castanea sativa）burs是可食用水果的收获和加工过程中产生的利用不足的固体副产品，在循环经济概念的背景下，可将其用作生物活性化合物的来源。这项工作中首次进行了超临界CO ₂提取栗子burs的研究。在10-30 MPa，35-70°C，10-35 g CO ₂的范围内进行了超临界萃取实验/ min和不同量的乙醇作为极性改性剂，以评估加工参数对提取物的提取率和抗氧化活性的影响。在25 MPa和45°C的条件下，以10％的乙醇为改性剂测量了总提取曲线，提取3 h后达到2.5％的总产率。此外，使用了四个不同的传质模型来描述动力学，表明与实验数据非常吻合。