## 3 Results and Discussion
### FT-IR Spectroscopy  
FT-IR spectra of the _S. montana_ EO (blue profile), b-CD (red profile) and the solid-state beta-cyclodextrin-_S. montana_ EO (b-CD-EO-S) mixture (green profile) are reported in Figure 1C. At 1463 cm\({}^{-1}\), the peak of the EO was found in the b-CD-EO-S pattern, though not provided by the cyclodextrin pattern itself, which was featured as a broad shifted shoulder. At 1057 cm\({}^{-1}\), a peak of the EO was observed in the b-CD-EO-S mixture profile. In this latter profile, a shouldered peak at 1003 cm\({}^{-1}\) was nearly coincident with a shoulder of the EO 997 cm\({}^{-1}\) peak, which was one of the most intense in the entire spectrum. The b-CD peak at 938 cm\({}^{-1}\) was convex, whilst it was observed to be concave in the b-CD-EO-S profile; moreover, the shoulder at 936 cm\({}^{-1}\) was nearly coincident with the EO peak at 935 cm\({}^{-1}\). A strong EO peak at 864 cm\({}^{-1}\) was noticed in the b-CD-EO-S reacted mixture, while b-CD itself provided a signal at 860 cm\({}^{-1}\). In the spectral range between 827 and 770 cm\({}^{-1}\), the b-CD pattern was convoluted in the b-CD-EO-S profile. The peak at 706 cm\({}^{-1}\) was asymmetrical in the b-CD-EO-S pattern; it actually broadened toward 720 cm\({}^{-1}\), where a rather intense EO peak occurred. The EO peak at 697 cm\({}^{-1}\) was distinctly noticed in the b-CD-EO-S reacted mixture profile. The 640 cm\({}^{-1}\) EO peak overlapped with the b-CD pattern in b-CD-EO-S; here, a shoulder found at 594 cm\({}^{-1}\) for a b-CD peak was correlated with the EO peak occurring at this frequency. In Figure 1D, the spectra of the _T. capitatus_ EO (green profile), b-CD (red profile) and the beta-cyclodextrin-_T. capitatus_ EO reacted (b-CD-EO-T) solid-state mixture (orange profile) are reported. In the aliphatic C-H spectral stretching region, the EO components were observed. The strong EO peak at 2964 cm\({}^{-1}\) was shifted in the b-CD-EO-T mixture at 2956 cm\({}^{-1}\) (Figure 1D). Furthermore, the strong EO peak at 2871 cm\({}^{-1}\) was maintained in the b-CD-EO-T pattern. In this latter pattern, the diagnostic broad b-CD signal at 1643 cm\({}^{-1}\) was accompanied by a featured shoulder at 1622 cm\({}^{-1}\), which also occurred in the EO profile. At 1526 cm\({}^{-1}\), in the spectral region where C=C stretching modes mixed with related in-plane C-H bending modes of the different terpenoid molecules occurred, and a strong peak was observed in the EO pattern; this featured was then found in the b-CD-EO-T system, which had shifted to 1515 cm\({}^{-1}\). The two strong EO peaks at 1461 and 1423 cm\({}^{-1}\) overlapped with the b-CD pattern in the b-CD-EO-T complex, with an inversion  
Figure 1: **(A)** b-CD chemical structure; **(B)** b-CD IR profile; **(C)**_S. montana_ EO (blue), b-CD (red) and the reacted b-CD-EO solid-state mixture (green) IR profiles; **(D)**_T. capitatus_ EO (green), b-CD (red) and the reacted b-CD-EO solid-state mixture (orange) IR profiles. of their relative spectral intensities. The EO feature at 1385 cm\({}^{-1}\) inside the alcoholic C-OH bending region was maintained in the b-CD-EO-T complex. At 1366 cm\({}^{-1}\), the observed b-CD-EO-T peak displayed a bandwidth that was correlated with the spectral feature that was noticed in the same region in the EO pattern. It is noteworthy that the EO shoulder at 1347 cm\({}^{-1}\) was observed at 1351 cm\({}^{-1}\) in the b-CD-EO-T mixture with a strong spectral intensity. Both the b-CD and EO profiles set a peak at 1304 cm\({}^{-1}\), which was then observed shifted to 1300 cm\({}^{-1}\) in the b-CD-EO-T system. Moreover, the strong EO peak at 1256 cm\({}^{-1}\) was shifted to 1247 cm\({}^{-1}\) in the b-CD-EO-T complex. In the same complex pattern, the 1188 cm\({}^{-1}\) peak was ascribed to the parent EO feature. The minimum transmittance frequency in the b-CD-EO-T profile at 1101 cm\({}^{-1}\) was correlated with the strong shifted peak occurring in the EO at 1118 cm\({}^{-1}\).