residues, zeta potential of the formed MSN-GFLGR7RGDS/α-
CD nanoparticles dramatically increased to +32.57 mV. The
result of FT-IR analysis (Supporting Information, Figure S4)
was consistent with that of zeta potential change. No signal at
3000−2800 cm−1 corresponding to the C−H absorbance of the
template agent CTAB indicated the good purity of the blank
MSNs. The typical signal at ∼2125 cm−1 belonging to the
absorbance of alkyne group strongly demonstrated the success
in the alkyne modification. Because of the click reaction
between alkyne and azido groups, the absorbance at ∼2125
cm−1 disappeared after the formation of DOX@MSN-
GFLGR7RGDS/α-CD nanoparticles.
To exactly determine the amount of each component in the
DOX@MSN-GFLGR7RGDS/α-CD nanoparticles, TGA anal-
ysis was used to examine the weight loss of the MSNs after each
modification. From the TGA curves (Figure 3), when the
temperature rose to 800 °C, the weight loss of blank MSNs and
DOX@MSN-GFLGR 7 RGDS/α-CD nanoparticles were
∼10.2% and 29.8%, respectively. From the weight loss in
Figure 3, the mass of grafted amino groups, α-CD rings and