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Ionic strength, permeation effect

Second, most membrane materials adsorb proteins. Worse, the adsorption is membrane-material specific and is dependent on concentration, pH, ionic strength, temperature, and so on. Adsorption has two consequences it changes the membrane pore size because solutes are adsorbed near and in membrane pores and it removes protein from the permeate by adsorption in addition to that removed by sieving. Porter (op. cit., p. 160) gives an illustrative table for adsorption of Cytochrome C on materials used for UF membranes, with values ranging from 1 to 25 percent. Because of the adsorption effects, membranes are characterized only when clean. Fouling has a dramatic effect on membrane retention, as is explained in its own section below. [Pg.2039]

Recently, impressive strides have been made in controlling the effective sizes of suspended macromolecules by adjusting ionic strength and pH to selectively alter the effective size in solution of nominally similar molecular weight components. This approach allows the smaller of the two components to pass through the membrane with the suspending solvent to the permeate to allow fractionation of two similarly sized dissolved macromolecules. [Pg.346]

IV. EFFECT OF SOLUTION IONIC STRENGTH UPON IONIC PERMEANT PERMEATION... [Pg.272]

To obtain insights into the electrostatic properties of the ionic solute permeation pathway through HEM, the effect of changes in the ionic strength of the... [Pg.272]

Figure 9.30 (a) The influence of donor pH and ionic strength of the donor medium on buserelin (a nonapeptide) permeation. (b) Continuous iontophoresis and release of buserelin through the stratum corneum, showing the effect of increasing the current. [Pg.365]

The effects of pH and ionic strength on the performance of an a-alumina microfiltration membrane from U.S. Filter was evaluated by Nazzal and Wies-ner [46]. Concerning pH effect on flux, results obtained in this work perceptibly differ from the previous one. Here the membrane operated at a significantly higher permeation rate at a pH well below the isoelectric point of the membrane. This variance can be explained considering the isoelectric point of the membrane was found at pH = 8.3 in this case while it was at pH = 3.5 in the... [Pg.594]

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Ionic permeation

Ionic strength

Permeation effect

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