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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Acknowledgments
The authors are grateful to CAPES, CNPq, FINEP and FAPITEC/SE for the financial support and fellowships. We thank M. L. V. Moreno, C. P. Figueira and Prof. A. L. Rangel for the images of SEM made in the Gonçalo Moniz Research Center, at the Oswaldo Cruz Foundation.
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dos Passos Menezes, P., Dória, G.A.A., de Souza Araújo, A.A. et al. Docking and physico-chemical properties of α- and β-cyclodextrin complex containing isopulegol: a comparative study. J Incl Phenom Macrocycl Chem 85, 341–354 (2016). https://doi.org/10.1007/s10847-016-0633-0
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DOI: https://doi.org/10.1007/s10847-016-0633-0