The leaves and petioles of Paulownia elongata x fortunei are residual fractions from the tree plantations commercially destined to the production of wood and their valorization could contribute to the rational utilization of this resource. The saccharidic fraction is the most abundant in both parts of the plant and the sugar profile is very similar, but the ethanol extractives are more abundant in leaves. Non isothermal processing was selected since it provided better results than isothermal extraction with shorter times. For this reason, optimization of autohydrolysis under non isothermal operation (140–240 °C) was performed for both materials: leaves and petioles. The final autohydrolysis temperature highly influenced the saccharidic, proteic, phenolic and volatile composition of the extracts. Operating under selected conditions leaves provided extracts with more antioxidant compounds than petioles. The proposed technology provides a variety of commercially valuable components, which could contribute to the integral use of this energetic crop following a biorefinery approach.

Graphic Abstract

中文翻译：

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水热提取泡桐叶和叶柄中的重要成分

泡桐泡桐的叶和叶柄是商业用途的树木种植园中的残余部分，用于木材生产，其价值评估可有助于合理利用该资源。糖精部分在植物的两个部分中都最丰富，糖的分布非常相似，但是乙醇提取物在叶中更丰富。选择非等温处理是因为它比等温提取具有更好的结果，但时间更短。因此，对两种材料（叶和叶柄）在非等温运行（140–240°C）下的自水解进行了优化。最终的自水解温度在很大程度上影响提取物的糖，蛋白，酚和挥发性成分。在选定的条件下操作可为叶提取物提供比叶柄更多的抗氧化剂化合物。

图形摘要