Xu Fei, Persson Björn, Löfås Stefan, Knoll Wolfgang
Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Langmuir. 2006 Mar 28;22(7):3352-7. doi: 10.1021/la052964f.
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.
