Abstract
(−)-Linalool is a monoterpene alcohol which is present in the essential oils of several aromatic plants. Recent studies suggest that (−)-linalool has antimicrobial, anti-inflammatory, anticancer, antioxidant, and antinociceptive properties in different animal models. The aim of this study was to prepare and characterize inclusion complexes of (−)-linalool with β-cyclodextrin (β-CD). Equimolar binary (−)-linalool/β-CD systems were prepared by physical mixture, paste (PM), and slurry methods (SC) and characterized by differential scanning calorimetry, thermogravimetric analysis, FT-IR spectroscopy, X-ray diffractometry, Karl Fisher titration, and scanning electron microscopy. Thermal characterization indicates the occurrence of complexation, mainly in paste complexes, which is present in the interval from 140 to 280 °C a gradual mass loss (4.6 %), probably related to (−)-linalool loss. FT-IR spectra showed changes that may be related to the formation of intermolecular hydrogen bonds between (−)-linalool and β-CD. The new solid-phase formed using the PM and SC methods, had a crystal structure which was different from the original morphology of β-CD.
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We would like to thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico/CNPq/Brazil) and Fundação de Amparo à Pesquisa do Estado de Sergipe/FAPITEC-SE for the financial support.
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Menezes, P.P., Serafini, M.R., Quintans-Júnior, L.J. et al. Inclusion complex of (−)-linalool and β-cyclodextrin. J Therm Anal Calorim 115, 2429–2437 (2014). https://doi.org/10.1007/s10973-013-3367-x
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DOI: https://doi.org/10.1007/s10973-013-3367-x