Geraniol has been an attractive compound for food preservation due to its antibacterial and antifungal actions. The main objective of this study was to produce and characterize polycaprolactone (PCL) capsules for the protection of the encapsulated geraniol essential oil. The encapsulation was carried out using a miniemulsion polymerization technique with an efficiency of (95.44 ± 0.60%). The capsules were obtained with a mean size of 148 nm and with a polydispersity index of 0.12. Transmission electron microscopy results confirmed the formation of spherical capsules of PCL coating the geraniol. From the analysis of thermogravimetry, it was possible to prove the thermal protection of geraniol by PCL coating since the release of the encapsulated geraniol occurred with temperatures 100 °C higher than the volatilization temperature of the natural compound. An important observation was that the microcapsules of PCL-geraniol immersed in aqueous suspensions at 4 °C showed good stability over 60 days.

中文翻译：

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聚己内酯聚合物在香叶醇封装中的应用：效率和稳定性评价

由于其抗菌和抗真菌作用，香叶醇一直是一种有吸引力的食品保鲜化合物。本研究的主要目的是生产和表征聚己内酯 (PCL) 胶囊，用于保护封装的香叶醇精油。使用细乳液聚合技术进行封装，效率为 (95.44 ± 0.60%)。获得的胶囊平均尺寸为 148 nm，多分散指数为 0.12。透射电子显微镜结果证实了包覆香叶醇的 PCL 球形胶囊的形成。从热重分析，可以证明 PCL 涂层对香叶醇的热保护作用，因为封装的香叶醇的释放发生在比天然化合物的挥发温度高 100 °C 的温度下。一个重要的观察结果是，PCL-香叶醇的微胶囊浸入 4°C 的水悬浮液中，在 60 天内显示出良好的稳定性。