Abstract
Isopulegol (ISOP) is a monoterpenoid alcohol presented in the essential oils of several plants that possesses therapeutic properties The aim of this work was prepare samples with ISOP and α- and β-cyclodextrins (α- and β-CD) through three different methods: physical mixture, paste method (PC) and slurry complexation (SC). In order to evaluate the formation of inclusion complexes, the techniques of differential scanning calorimetry, thermogravimetry/derivative thermogravimetry, fourier transform infrared spectroscopy, X-ray diffractometry (XRD), gas chromatography–mass spectrometry analyses (GC/MS), docking, nuclear magnetic resonance and scanning electron microscopy were considered. The analyses of the α-CD or β-CD/ISOP revealed the formation of a complex mainly through the PC and SC methods for α-CD and β-CD, respectively. XRD diffraction characteristics presented formation of a trend to new solid phase, which suggested the formation of inclusion complexes. The GC/MS demonstrated that the PC method was the best one to form complexation with α-CD (48.8 %). Concerning β-CD, the SC method exhibited the strongest complexation (68.3 %). Furthermore, the molecular theoretical docking study demonstrated that α-CD/ISOP inclusion complex formed a more stable complex than did the β-CD/ISOP inclusion complex.
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