Fourier transform infrared (FT-IR) analysis of the particles
Empty and bioactive-containing capsules of ca. 1 mg were
grounded and dispersed in 130 mg of spectroscopic grade potassium
bromide (KBr). A pellet was then formed by compressing the
sample at ca. 150 MPa. FT-IR spectra were collected in transmission
mode using a Bruker (Rheinstetten, Germany) FT-IR Tensor 37
equipment. The spectra were obtained by averaging 10 scans at
1 cm1 resolution.