Fourier-transform infrared spectroscopy (FT-IR) was used to characterize the ICs. The spectra of the EO and β-CD alone were also obtained for comparison. The IC and β-CD spectra were obtained using KBr pressed pellets, while the spectra of the EOs were obtained using KBr plates. The KBr pellets were prepared by mixing the ICs with KBr powder in a ratio of ~1:10 and grounding in a mortar and pestle. The homogenized powder was then pressed into a disk with a hand press for ~2 min. The EO spectra were obtained by spreading a thin layer of the oil between polished KBr plates. The FT-IR spectra were obtained in the range of 400–4000 cm−1 with a resolution of 3.857 cm−1 from an average of 32 scans on a FT-IR spectrometer (Nicolet Avatar 360, Nicolet Instrument Corporation, Danbury, CT, USA).

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