Steric Rejection of Polymeric Solutes by Membranes with Uniform Pore Size Distribution

Membrane fractionation of a β-lactoglobulin tryptic digest: Effect of the pH

“…Under these conditions charge effects are minimized and it's supposed that Tr is mainly dependent on sieving effects. However, when experimental Tr values are compared with the theoretical values calculated according to a sieving model (Zeman and Wales, 1981), the formers are always higher and, as can be noted in Fig. 5, the greater differences between theoretical and experimental data correspond to the most hydrophobic peptides.…”

“…The theoretical size transmission was calculated according to Zeman and Wales (1981) Tr ¼ ð1 À ðk Á ðk À 2ÞÞ 2 Þ Á expðÀ0:7146k 2 Þ ð 2Þ with k ¼ MW MWCO 0:4 In this sieving model, the NF membrane is assumed to be a network of perfectly cylindrical and parallel pores in which solvent velocity follows Poiseuille's law with a parabolic profile and solutes are assimilated to hard spheres.…”

“…In the case of peptides with zero net charge, their transmission (Tr) is mainly dependent on the size exclusion effect as described by Ferry (1936) and corrected by Zeman and Wales (1981). However, it has been shown that other physicochemical properties such as hydrophobicity may play a role when uncharged organic solutes are filtrated (Verliefde et al, 2008).…”

Non-Dissolved Solids Removal During Palm Kernel Oil Ultrafiltration

“…The rejection percentage decreases from 94% to 51% with rising TMP from 1 bar to 2 bar. The increasing TMP decreases NDS rejection due to both concentration polarization and/or the shear-induced solute distortion at a higher TMP (Zeman and Wales, 1981). A higher TMP relates to a higher oil velocity as well.…”

Advancements in the Fractionation of Milk Biopeptides by Means of Membrane Processes

“…Charge effects are minimized in this case and the transmission of the solutes depends largely on the size exclusion effects of the membrane. This sieving effect is usually modeled and corrected [55] using continues hydrodynamic models such as originally proposed by Ferry. In this model, the membrane is assumed to be a network of perfectly cylindrical and parallel pores in which solvent velocity follows Poiseuille's law with a parabolic profile and solutes are assimilated to hard spheres.…”