Fig. 2

Uptake and emission of ICG/PTX@RGE-EV. A Fluorescence intensity of NIR fluorescence imaging in ICG/PTX@RGE-EV of different concentrations. B UV–VIS absorption spectra of free ICG and ICG/PTX@RGE-EV. C Fluorescence emission spectra of free ICG and ICG/PTX@RGE-EV (excitation wavelength: 808 nm). Measurement data were expressed as mean ± standard deviation. Data comparison was analyzed by one-way ANOVA among multiple groups, followed by Tukey’s post hoc test. *p < 0.05 vs. the 0 µg/mL group. The experiment was repeated three times independently