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The Effect of Polyelectrolyte Chain Length on Layer-by-layer Protein/polyelectrolyte Assembly—an Experimental Study by Milan Houska; Eduard Brynda; Karolina Bohatá is a Chemistry article available to read on EtoBox.

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The effect of polyelectrolyte chain length on the formation of multilayered assemblies of alternating globular proteins and linear polyanions prepared by the layer-by-layer electrostatic adsorption technique was investigated. The systems studied were albumin/sodium poly(styrenesulfonate), immunoglobulin G/sodium poly(styrenesulfonate), albumin/sodium dextran sulfate, and albumin/heparin. The formation of assemblies was followed using FTIR multiple internal reflection spectroscopy. While the amount of polyelectrolyte adsorbed on the first (primary) protein layer did not depend on its molecular weight, the effect of polyelectrolyte chain length was clearly observed in the following steps of alternating adsorption. Some short-chain polyanion molecules were removed from the surface when a next protein layer was adsorbed from solution. The short polyanion chains were not able to make a sufficient number of ion pairs for stable interaction with additional protein molecules and left the surface as soluble protein/polyanion complexes. The most pronounced effect could be seen with sodium poly(styrenesulfonate) of M w up to ca. 2 × 10 4 , but a detectable effect could be traced even up to M

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Author

Milan Houska; Eduard Brynda; Karolina Bohatá

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

2004

Language

EN

Field

Chemistry (Physical Sciences)