Nanofiltration (NF) (MWCO 150-300 Da) was evaluated for the recovery of phenolic compounds from the wastewater from the production of yellow mustard protein isolates. Rejection coefficients of 0.70 and 0.87 and transmembrane fluxes of 51.3 L/hm2 and 28.8 L/hm2 were observed under alkaline and acidic conditions, respectively. At low pH, 77% of the phenolic compounds fed to the process were recovered in the retentate. Combination of diafiltration (DF) with NF was beneficial only when processing at low pH. The permeate from the NF process a contained <100 ppm total phenolics, which suggests the possibility of recycling these effluents in the production of yellow mustard protein isolates. p-Hydroxybenzoic acid was the major phenolic compound found both in the waste effluent and in the products of NF processing. Sinapic acid constituted a secondary fraction, and derivatives of quercetin and kaempferol were also detected.

中文翻译：

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从黄芥末蛋白分离的副产物中回收酚类化合物。

对纳滤（NF）（MWCO 150-300 Da）进行了评估，以从黄色芥菜蛋白分离物的生产中回收废水中的酚类化合物。在碱性和酸性条件下的排斥系数分别为0.70和0.87，跨膜通量为51.3 L / hm2和28.8 L / hm2。在低pH值下，进料到该过程中的酚类化合物中有77％从渗余物中回收。仅在低pH值下处理时，渗滤（DF）与NF的结合才是有益的。NF过程中的渗透物所含的酚总量小于100 ppm，这表明有可能在生产黄色芥菜蛋白分离物时回收这些废水。对羟基苯甲酸是在废水和NF加工产品中发现的主要酚类化合物。