Abstract Anthocyanins were concentrated from ethanolic jussara (Euterpe edulis) extract by nanofiltration. Six commercial flat-sheet membranes with nominal molecular weight cut-off ranging from 150 to 1000 g mol−1 (NF270 and NF90 from Filmtec Dow, NP010 and NP030 from Microdyn Nadir and Desal 5-DK and Desal 5-DL from GE Osmonics) were characterized in terms of their textural properties, surface morphology and further evaluated for jussara extract nanofiltration performance. Nanofiltration trials were conducted on a stainless steel stirred dead-end cell, in which permeate fluxes were recorded by keeping operational conditions constant at 25 bar and 25 °C. N2 adsorption isotherms and atomic force microscopy images revealed a nanoporous bulk for all membranes. Changes in roughness and contact angle of membranes were observed to occur after nanofiltration trials. The Desal 5-DK membrane showed the highest efficiency for jussara extract nanofiltration due to its highest flux and smallest flux decline, in addition to the highest anthocyanins retention capacity in relation to the other commercial nanofiltration membranes.

中文翻译：

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纳滤膜特性对菊苣乙醇提取物(Euterpe edulis)花色苷含量的影响

摘要 花青素是通过纳滤从jussara (Euterpe edulis) 乙醇提取物中浓缩得到的。六种标称截留分子量范围为 150 至 1000 g mol-1 的商用平板膜（来自 Filmtec Dow 的 NF270 和 NF90，来自 Microdyn Nadir 的 NP010 和 NP030 以及来自 GE Osmonics 的 Desal 5-DK 和 Desal 5-DL）对它们的质地特性、表面形态进行表征，并进一步评估 jussara 提取物的纳滤性能。纳滤试验是在不锈钢搅拌死端池上进行的，其中通过将操作条件保持在 25 bar 和 25 °C 下保持恒定来记录渗透通量。N2 吸附等温线和原子力显微镜图像显示所有膜都具有纳米多孔体。在纳滤试验后观察到膜的粗糙度和接触角发生变化。Desal 5-DK 膜显示出最高的 jussara 提取物纳滤效率，因为它具有最高的通量和最小的通量下降，以及与其他商业纳滤膜相比最高的花青素保留能力。