Surface plasmon optical studies of carboxymethyl dextran brushes versus networks |
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Authors: | Xu Fei Persson Björn Löfås Stefan Knoll Wolfgang |
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Institution: | Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany. |
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Abstract: | The conformational changes of carboxymethyl dextran (CMD) substrates induced by variations in pH and ionic strength were studied using surface plasmon field-enhanced fluorescence spectroscopy (SPFS). A typical response was an increase in swelling upon increasing the pH and decreasing the ionic strength. Furthermore, the effects of the surface charge and cross-link density of the CMD on the degree of stimulus responses were investigated. The swelling/collapse ratio decreased with decreasing carboxyl group surface concentration and increasing cross-link density. |
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