Bark from trees obtained from sustainably managed plantations used in the production of timber, pulp and paper is an under-utilised waste in many countries across the world. However, in the context of an integrated biorefinery, they may serve as a valuable feedstock for the production of high-value products for increased revenue generation and mitigation of environmental impacts for the ailing forestry, timber, pulp and paper industry. In this study, optimum accelerated solvent extraction conditions were established for the recovery of total polyphenolic compounds (TPC) and total extractive content (TEC) from barks obtained from four Eucalyptus tree species (E.dunnii, E.grandis, E.smithii and E.nitens). Using a response surface methodology and Box-Behnken experimental design, optimum extraction conditions found were an extraction temperature of 117 °C, three extraction cycles, and a milled bark particle size class of 500–850 μm. E. smithii showed the highest TEC at 21.9% and the highest TPC at 4.7 g/100 g gallic acid equivalents (GAE).

从木材，纸浆和造纸生产中使用的可持续管理人工林中获得的树木的树皮在世界许多国家/地区都是利用不足的废物。但是，在整合的生物精炼厂的背景下，它们可以用作生产高价值产品的有价值的原料，以增加创收并减轻陷入困境的林业，木材，纸浆和造纸行业的环境影响。在这项研究中，建立了最佳的加速溶剂萃取条件，以从四种桉树（E.dunnii，E.grandis，E.smithii和E. .nitens）。使用响应面分析法和Box-Behnken设计实验设计，最佳提取条件是发现的提取温度为117℃，三个提取循环，并经研磨树皮粒径类的500-850  μ米。史密斯肠杆菌的TEC最高，为21.9％，TPC最高，为4.7 g / 100 g没食子酸当量（GAE）。