Pomegranate industrial residues are rich in highly valuable phenolics, especially the bioactive punicalagin (PU) and ellagic acid (EA). The effect of extraction conditions on the recovery of polyphenols was investigated with special insight at the selectivity for EA and PU, along with the monitoring of sugar extraction. Macerations in ethanol and/or water, extractions by scCO₂:ethanol mixtures and pressurized ethanol were compared on the basis of yields, kinetics and extract composition. High extraction yields up to 61 g/100 g_residue were obtained because of significant extraction of sugars even with CO₂-based solvents. The TPC and sugar extraction yields were sensitive to the solvent polarity and pressure. Thirty-two phenolics were identified in most extracts whereas in scCO₂:EtOH extracts purity of EA with respect to other phenolics was maximal, thus highlighting the selectivity of this technique. For the first time, extracts of high purity in EA and devoid of PU were produced in only one step.

石榴工业残留物富含高价值的酚类物质，尤其是生物活性安石榴苷 (PU) 和鞣花酸 (EA)。通过对 EA 和 PU 选择性的特别了解，以及对糖提取的监测，研究了提取条件对多酚回收率的影响。基于产率、动力学和提取物组成比较乙醇和/或水中的浸渍、scCO ₂ :乙醇混合物的提取和加压乙醇。由于即使使用 CO ₂也能显着提取糖分，因此获得了高达 61 g/100 g_残留物的高提取率基溶剂。TPC 和糖提取率对溶剂极性和压力敏感。在大多数提取物中鉴定出 32 种酚类物质，而在 scCO ₂ :EtOH 提取物中，EA 相对于其他酚类物质的纯度最高，因此突出了该技术的选择性。第一次，仅一步就可以生产出含有高纯度 EA 且不含 PU 的提取物。