Paulownia wood demand is increasing, but other parts of the tree remain underused. The leaves have medicinal properties, and their processing with a clean technology was explored. Supercritical fluid extraction (SFE) was proposed for the production of extracts from Paulownia elongata x fortunei leaves. Three isotherms (35 °C, 45 °C, and 55 °C) were studied in the pressure range of 10–30 MPa to assess their influence on the extraction yield and antiradical properties. The use of ethanol as cosolvent was also evaluated. A global extraction yield of 4 g extract /100 g of leaves was obtained at 30 MPa and 45 °C using 10% ethanol (w/w) as modifier; the last fractions reached up to 0.30 g Trolox eq./g extract. Serial extractions with different concentrations of ethanol (60, 70, 80, and 96%) were performed. The global yield obtained with 70% ethanol in three stages was 32.9 g extract/100 g leaves, and the antiradical capacity of the first stage extract was equivalent to 0.4 g Trolox/g extract. Extraction kinetics was studied, and overall extraction curves were represented using Sovová’s model.

泡桐木的需求量正在增加，但树的其他部分仍未得到充分利用。叶片具有药用特性，并探索了使用清洁技术对其进行加工的方法。提出了超临界流体萃取（SFE）用于生产泡桐（Paulownia elongata x fortunei）的提取物树叶。在10–30 MPa的压力范围内研究了三个等温线（35°C，45°C和55°C），以评估它们对提取率和抗自由基性能的影响。还评估了乙醇作为助溶剂的使用。使用10％乙醇（w / w）作为改性剂，在30 MPa和45°C的条件下，获得的总提取量为4 g提取物/ 100 g叶片；最后的馏分达到0.30 g Trolox eq./g提取物。用不同浓度的乙醇（60％，70％，80％和96％）进行了连续萃取。用70％乙醇在三个阶段中获得的总产量为32.9 g提取物/ 100 g叶片，第一阶段提取物的抗自由基能力相当于0.4 g Trolox / g提取物。研究了萃取动力学，并使用Sovová模型表示了总萃取曲线。