2.3.2. Chemical Structure Investigation by Fourier-Transform Infrared Spectroscopy (FTIR)

FTIR spectroscopy (Shimadzu IR PRESTIGE-21, Kyoto, Japan) was used to determine any interactions or changes at the molecular level of the starting materials used in the preparation of the nanofibers and also for the nanofibers themselves. A comparison of the nanofibers’ spectra can provide information about possible interactions. A small amount of the appropriate sample (drug, polymer, or nanofiber) was mixed with KBr and then compressed by an FTIR manual press under a pressure of 10 tons for 2–3 min. The samples were scanned between 400–4000 cm⁻¹.