Fig. 2

In vitro characterization of BBA/FA-PEG-CM-β-CD. A Infrared spectrum, B XRD spectrum, C Differential scanning calorimetry (DSC) and D Thermal gravimetric analysis (TGA) of (a) BBA, (b) FA-PEG-CM-β-CD, (c) mixture of BBA with FA-PEG-CM-β-CD, and (d) BBA/FA-PEG-CM-β-CD. Scanning electron microscopy (SEM) images of E FA-PEG-CM-β-CD and F BBA/FA-PEG-CM-β-CD were obtained by scanning electron microscopy. G Drug release behaviors of BBA, BBA/CM-β-CD, and BBA/FA-PEG-CM-β-CD were assessed in PBS medium (pH7.4) at 37 °C. H Changing of entrapment efficiency of BBA/FA-PEG-CM-β-CD under high temperature and high humidity conditions