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Contribution of pH dependent osmotic pressure to amino acid transport through nanofiltration membranes

机译:pH依赖性渗透压对氨基酸通过纳滤膜传输的贡献

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A concept is presented to determine the osmotic pressure of amino acid solutions by altering the stoichiometric coefficient of the van't Hoff law corresponding to the dissociation state of the amino acids.The osmotic pressure is greatly affected by the feed pH,which significance has been overseen in membrane permeation studies.Nanofiltration experiments were carried out in order to investigate the effect of osmotic pressure on the permeation of amino acids through polymeric membrane,L-Alanine aqueous solutions of various feed pH(6.0,9.7 and 11.1)were concentrated in discontinuous operation mode with complete retentate recycle.It has been stated by many authors,that polymeric nanofiltration membranes possess higher rejection for amino acids in negatively charged form than for zwitterions.In our study we demonstrate that this tendency can be reversed in higher concentration range.
机译:提出了一种通过改变与氨基酸解离态相对应的范霍夫定律的化学计量系数来确定氨基酸溶液的渗透压的方法。渗透压受进料pH的影响很大,其意义已经得到为了研究渗透压对氨基酸通过聚合物膜渗透的影响,进行了纳滤实验,将不同pH(6.0、9.7和11.1)进料的L-丙氨酸水溶液不连续地浓缩。许多作者指出,聚合物纳米过滤膜对带负电荷的氨基酸的排斥性要比对两性离子更高。在我们的研究中,我们证明了这种趋势可以在更高的浓度范围内逆转。

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