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林产化学与工业 ›› 2022, Vol. 42 ›› Issue (4): 47-53.doi: 10.3969/j.issn.0253-2417.2022.04.007

• 研究报告 • 上一篇    下一篇

薄荷精油微胶囊的制备及性能表征

宋秀明, 刘玉(), 徐翔宇, 孙蕾   

  1. 东北林业大学 材料科学与工程学院,黑龙江 哈尔滨 150040
  • 收稿日期:2021-07-07 出版日期:2022-08-28 发布日期:2022-09-01
  • 通讯作者: 刘玉 E-mail:liuyu820524@126.com
  • 作者简介:刘玉,副教授,硕士生导师,研究领域为木质复合材料、绿色环保人造板生产技术、装饰材料气味分析及检测;E-mail: liuyu820524@126.com
    宋秀明(1996—),女,黑龙江哈尔滨人,硕士生,研究方向为绿色环保人造板生产技术
  • 基金资助:
    中央高校基本科研业务费专项资金项目(2572020BB01)

Preparation and Characterization of Peppermint Essential Oil Microcapsules

Xiuming SONG, Yu LIU(), Xiangyu XU, Lei SUN   

  1. College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, China
  • Received:2021-07-07 Online:2022-08-28 Published:2022-09-01
  • Contact: Yu LIU E-mail:liuyu820524@126.com

摘要:

以天然高分子材料明胶和阿拉伯树胶粉为壁材,薄荷精油为芯材,采用复合凝聚法制备薄荷精油微胶囊,通过单因素试验考察不同工艺条件对薄荷精油微胶囊包埋率和粒径的影响,并采用SEM、TEM、FT-IR和TG等方法对微胶囊的形貌结构和热稳定性进行表征。结果表明:在壁材质量分数2%、芯壁比2∶1、pH值3.7、搅拌速率600 r/min和固化时间6 h时,微胶囊的包埋率可以达到44.9%,平均粒径为5.8 μm。红外光谱分析证实薄荷精油成功被壁材包覆,SEM和TEM分析表明微胶囊呈规则的圆球形,壳壁材料之间通过静电作用结合成具有“白包黑”的壳核结构,核的直径2 μm左右,壳的厚度0.6 μm左右。热重分析表明薄荷精油在130 ℃后质量仅残留5.4%,包埋后的薄荷精油微胶囊190 ℃后才有明显质量损失,热稳定性明显提高,薄荷精油的微胶囊化提高了薄荷精油的稳定性和利用率。

关键词: 薄荷精油, 微胶囊, 复合凝聚, 稳定性

Abstract:

The microcapsules of peppermint essential oil were prepared by the composite coagulation method, which were made of natural polymer gelatin and arabian gum powder as wall materials, and peppermint essential oil as core material. The effects of different process conditions on the embedding rate and particle size of peppermint essential oil microcapsules were investigated by single-factor tests. The morphological structure and thermal stability of the microcapsules were also characterized by SEM, TEM, FT-IR and TG. The results showed that the oil content of microcapsules prepared was 44.9%, and the average particle size was 5.8 μm with the mass fraction of shell material 2%, ratio of core to shell 2∶1, the pH 3.7, the stirring speed 600 r/min and the curing time 6 h. The result of FT-IR confirmed that the essential oil of peppermint was successfully coated by wall materials. SEM and TEM analysis showed that the microcapsules were in the shape of regular round spheres, and the shell-wall materials were combined to form a "white-on-black" core-shell structure by electrostatic interaction, with a diameter of about 2 μm and a thickness of about 0.6 μm. The TG showed that the mass residue of peppermint essential oil was only 5.4% at 130 ℃. Comparatively, the mass loss of peppermint essential oil microcapsules could be found only at the temperature higher than 190 ℃, which showed that the thermal stability of peppermint essential oil was significantly improved after embedding. Thus, the quality loss and thermal stability of peppermint essential oil were improved by microencapsulation.

Key words: peppermint essential oil, microcapsules, complex coacervation, stability

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