Supramolecular Interaction of Litsea cubeba Essential Oil with β-Cyclodextrin and Physicochemical Properties of the Complex
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Abstract:
Litseacubeba essential oil is an important condiment and perfume, which is widely used in the food and cosmetics industry. The supramolecular interaction between citral from the plant’s essential oil and β-Cyclodextrin (β-CD) was studied by UV spectrophotometry, and the process of preparing Litsea cubeba oil-β-CD inclusion complex was optimized. In addition, its physicochemical properties were investigated by ultraviolet-visible (UV) spectrometry, infrared (IR) spectrometry, X-ray diffractometry (XRD), and scanning electron microscopy (SEM). The results showed that the stoichiometric ratio of Litsea cubeba essential oil-β-CD inclusion complex was 1:1, and the formation constant of the complex decreased with increasing temperature. The thermodynamic parameters (ΔH?<0, ΔS?<0, ΔG?<0) demonstrated that the formation of Litsea cubeba essential oil-β-CD inclusion complex was a spontaneous exothermic process, and the main driving force was a change in enthalpy (ΔH). The physicochemical properties of Litsea cubeba essential oil-β-CD complex were visibly changed and that Litsea cubeba essential oil and β-CD were combined by Van der Waals force or hydrogen bond to form a new phase. Otherwise, the complex showed good thermal stability and photo stability, and the original components of Litsea cubeba essential oil were well preserved in the complex.
