2.6. Chemical composition characterization
An attenuated total reflectance (ATR)-Fourier transform infrared
(FTIR) spectrometer (PerkinElmer, Spectrum Two, UK) was used to
analyze the chemical structure of encapsulated GLS/A beads. 0.1 mg
sample of GLS, alginate powder and GLS/A beads were placed on the
sample holder and made in contact with diamond crystal, respectively.
The spectra were collected over a range of 4000–800 cm−1 with a
spectral resolution of 4 cm−1
. Each spectrum was collected by cumulating
64 scans, then background and baseline corrected.