Preparation and slow release kinetics of apple fragrance/β-cyclodextrin inclusion complex

In this study, the optimum preparation conditions for apple fragrance (AF)/β-cyclodextrin (β-CD) inclusion complex were determined by single-factor experiments with encapsulation efficiency (EE%) and loading capacity (LC%) as indicators. The results of particle size analysis indicated that the average diameter of the inclusion complex was 3.6 µm. DSC analysis indicated that the AF/β-CD inclusion complex had a good stability. The release study showed that the retention rate of the AF was 34.4% 60 days later at 50 °C. Avrami’s equation was used to analyze the release kinetics of fragrance/β-CD inclusion complex under different temperatures. The results showed that the release of encapsulated fragrance was between diffusion limiting kinetics and first-order release kinetics at 4 °C, and first-order mode release mechanism at 25 and 50 °C. These results demonstrated that the stability of encapsulated fragrance was enhanced and achieved the purpose of controlled release.