[Study on the Release Process for Lavender Essential Oil Microcapsule by FTIR].

In order to find out the constitute forms of lavenderessential oil-β-cyclodextrin inclusion complex and the process of release of lavenderessential oilwith temperature changes, we used Fourier transform infrared spectroscopy (FTIR) method to compare and analyze lavender essential oil (LO), β- cyclodextrin (β-CD) and lavender essential oil microcapsule (LOM), while the infrared spectral changes of release process at different temperatures of the oil in microcapsulewas analyzed, andthe principal component method was further used to explore the physical and chemical stability and release process of LO after it was entrapped by β-CD. The results showed that comparative analysis by infrared spectroscopy, characteristic peaks of LO embedded had redshift peak and its peak shape became wider, which mainly affected by the formation of molecular hydrogen bonds , p-π conjugate phenomenon and the spatial structure of β-CD; in addition, we set temperature range from 25 to 95 ℃, the temperature interval of 10 ℃, and then determined LOM by IR spectrum to test and verify physical and chemical stability and release conditions of LO which was embedded by β-CD. The results demonstrated that, water molecule inLOM hydrate was easily lost and the essential oil component of LOM was in stable physical and chemical properties, and the amount of escaping for LO at 95 ℃ was less than 6.5 percent when the release was slow; through IR spectra data of variable temperature was analyzed under principal component analysis (PCA), We may find that the cumulative variance of the first two principal components was 99.3%. And PC1 ingredient could be considered as the characteristic variable of β-CD and PC2 component was the characteristic variable of LO by principal component load analysis. The result showed that the release of ester from LOM was faster than alcohol. It was simple and efficient by using infrared analysis method to have a comprehensive understanding on the physical and chemical stability and the release process of the embedded oil, and it will provide a new theoretical support for the study on the release process of lavender essential oil microcapsule.