Surface plasmon optical studies of carboxymethyl dextran brushes versus networks.
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.
Xu
Fei
F
Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Persson
Björn
B
Löfås
Stefan
S
Knoll
Wolfgang
W
D003911:Dextrans / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009994:Osmolar Concentration; D013050:Spectrometry, Fluorescence
D003911:Dextrans; C014392:carboxymethyl dextran