Abstract Hydrophobic polymeric (0.45 and 0.20 μm polytetrafluoroethylene (PTFE) and 0.10 μm polypropylene (PP)) membranes were efficiently applied for cactus pear juice and sugars solutions concentration using Osmotic Membrane Distillation (OMD) process. It is reported that the PTFE membranes gave higher permeate fluxes and higher final juice concentrations. Furthermore, the filtration of raw juice prior to OMD process, the extension of the process time and the increase of processing temperature resulted in the increase of the final juice concentration. Using 0.45 μm PTFE membrane, the final concentration of the filtered juice (FJ) was 16.4 °Brix ± 0.1 (at 20 °C, after 5 h) and 23.4 °Brix ± 0.2 (at 35 °C, after 18 h). The juice quality was assessed by determining the juice viscosity, the total phenolic content, total flavonoids content, antioxidant activity and phenolic acids content. It was revealed that the physicochemical properties were preserved in the concentrated juice.

中文翻译：

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使用各种疏水性多孔膜实施渗透膜蒸馏以浓缩糖溶液并保持仙人掌梨汁的质量

摘要 疏水性聚合物（0.45 和 0.20 μm 聚四氟乙烯 (PTFE) 和 0.10 μm 聚丙烯 (PP)）膜使用渗透膜蒸馏 (OMD) 工艺有效地应用于仙人掌梨汁和糖溶液的浓缩。据报道，PTFE 膜具有更高的渗透通量和更高的最终果汁浓度。此外，OMD工艺前对原汁的过滤、工艺时间的延长和工艺温度的升高导致最终汁液浓度的增加。使用 0.45 μm PTFE 膜，过滤后的果汁 (FJ) 的最终浓度为 16.4 °Brix ± 0.1（20 °C，5 小时后）和 23.4 °Brix ± 0.2（35 °C，18 小时后）。通过测定果汁粘度、总酚含量、总黄酮含量、抗氧化活性和酚酸含量。结果表明，该浓缩汁保留了理化特性。