Fig. 5

The FTIR spectra of pure CHX, synthesized MSN and PLGA has been shown for reference. Pure CHX exhibiting characteristic peaks at 1093 and 2947 cm⁻¹ (pointers) that indicates C-N bending and C-H vibration. The two bands that appeared at 1080 and 810 cm⁻¹ belonged to the characteristic peaks of Si–O-Si on the SiO2 framework of MSNs. PLGA displays characteristic absorption bands at 1100–1250 and 1750–1760 cm⁻¹ which represent the esters and carbonyl groups (dotted circle). The above-mentioned fingerprint peaks specific to CHX can be observed in all the CHX-loaded/MSN and CHX-loaded/MSN-PLGA