摘要
为提高薰衣草精油的稳定性并延长其缓释性能,以天然高分子材料麦芽糊精为壁材,薰衣草精油为芯材,二氧化硅粒子作为分散剂,通过喷雾干燥工艺制备薰衣草精油微胶囊。分析和表征薰衣草精油微胶囊的形貌、组成和精油含量,并对薰衣草精油的释放行为进行探究。结果表明:当进风温度为180℃,风速为50 m^(3)/h,采用快速通针模式,蠕动泵流速为15 mL/min时,所制备的微胶囊数均粒径为(10.80±5.10)μm,精油含量为36.87%,包埋率为93.38%。通过Avrami’s公式对微胶囊释放过程进行拟合,发现在不同温度下,薰衣草精油微胶囊精油的释放是非恒速、非稳态动力学过程,4℃低温条件保存薰衣草精油微胶囊可有效降低芯材的释放速率。此外,喷雾干燥后的微胶囊粉末可分散于水中,在25℃下储存50 h后仍然具有良好的稳定性。该研究结果进一步拓宽了薰衣草精油的应用领域,延长其使用期限。
To improve the stability and prolong the sustained-release properties of lavender essential oil, lavender essential oil microcapsules were prepared using spray drying method, with natural high polymer material maltodextrin as wall material, lavender essential oil as the core material, and silicon dioxide particles as the dispersant. The properties such as morphology, composition, and essential oil content of the lavender essential oil microcapsules were characterized and the release behavior of lavender essential oil was analyzed. The results indicated that when the inlet air temperature was 180 ℃, the wind speed was 50 m^(3)/h, fast nozzle cleaning mode was adopted, the flow rate of peristaltic pump was 15 mL/min, the mean particle size of the microcapsules obtained was(10.80±5.10) μm, the essential oil content was 36.87%, and the embedding rate was 93.38%. The release process of microcapsules was fitted by Avrami′s formula and it was found that the release of lavender essential oil microcapsules at different temperatures was a non-constant and unsteady dynamic process, and the release rate of this material could be effectively reduced by preserving lavender essential oil microcapsules at a low temperature(4 ℃). Besides, the microcapsule powder after spray drying can be dispersed in water, and still has good stability after storage at 25 ℃ for 50 h, which further expands the application field of lavender essential oil and prolongs its service life.
作者
温礼馨
赵路通
秘一芳
曹志海
WEN Lixin;ZHAO Lutong;MI Yifang;CAO Zhihai(Key Laboratory of Advanced Textile Materials and Manufacturing Technology,Ministry of Education,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《浙江理工大学学报（自然科学版）》
2021年第3期295-301,共7页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
国家自然科学基金项目(51573168)。
关键词
麦芽糊精
薰衣草精油
喷雾干燥
微胶囊
释放行为
maltodextrin
lavender essential oil
spray drying
microcapsule
release behavior
