Figure 3.

FTIR characterization of the BSA–capsaicin pure molecules and the effect of the increment of capsaicin in the nanostructure formation. (a) FTIR spectral characterization of BSA and capsaicin; the scanning spectral range was between 650–4000 cm⁻¹. (b) Spectral graphs of the BSA-capsaicin nanoparticles at 0, 16.4, 32.5, 48.7 and 65.0 µg/mg, (lines in gradient of grey). The treatments showed between 3682 to 3104 cm⁻¹ a deformation of the peak that corresponds to N–H stretching (rectangle blue), and the second region is the amide I and amide II of the BSA with the hydrophobic side chain of the capsaicin, from 1710–1126 cm⁻¹.