Fig. 4

A FT-IR cGO, cGO-DOX, and cGO-Sili. B Zeta potential values of Apt-cGO, Apt-cGO-DOX, and Apt-cGO-DOX-Sili formulations. C UV–Vis spectral absorbance of free DOX (blue), free Sili (black), Apt-cGO-DOX (red), and Apt-cGO-Sili (green). D UV–Vis spectral absorbance of Apt-cGO-DOX-Sili. FTIR: Fourier transform infrared; UV–Vis: Ultraviolet–visible; cGO: carboxylated graphene oxide; Apt: aptamer; DOX: doxorubicin; Sili: silibinin