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5.8μm。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2μm左右,壳的厚度0.6μm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。
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 5.8μm 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 2μm and a thickness of about 0.6μm.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.
作者
宋秀明
刘玉
徐翔宇
孙蕾
SONG Xiuming;LIU Yu;XU Xiangyu;SUN Lei(College of Materials Science and Engineering,Northeast Forestry University,Harbin 150040,China)
出处
《林产化学与工业》
CAS
CSCD
北大核心
2022年第4期47-53,共7页
Chemistry and Industry of Forest Products
基金
中央高校基本科研业务费专项资金项目(2572020BB01)。
关键词
薄荷精油
微胶囊
复合凝聚
稳定性
peppermint essential oil
microcapsules
complex coacervation
stability
