Figure 2
From: Temperature responsive chromatography for therapeutic drug monitoring with an aqueous mobile phase
Characterization of the prepared beads. (A) Fourier transfer infrared spectra of the prepared beads. The dashed lines (i) and (ii) indicate the peak attributed to C=O stretching vibrations and N–H bending vibrations, respectively. (B) SEM images of the prepared beads. (1) aminopropyl silica beads, (2) V-501 immobilized silica beads, (3) PNIPAAm modified silica beads prepared via polymerization for 5 h, and (4) PNIPAAm modified silica beads prepared via polymerization for 18 h. Scale bars denote 5 μm.
