摘要
利用多巴胺(DA)在碱性溶液中的自氧化和聚合,在香料乳液液滴表面涂覆聚多巴胺(PDA)层制备香料PDA纳米胶囊,比较了PDA对不同香料的包覆性能和缓释效果。结果发现苯乙醛和香茅醛因与多巴胺(DA)发生Maillard反应而不能被包覆,苯乙醇、香茅醇、乙酸苯乙酯和乙酸香茅酯则能被包覆在纳米胶囊内部,扫描电子显微镜(SEM)和动态激光光散射(DLS)结果显示:香料纳米胶囊基本呈球形,分布较均匀,香料种类对粒径影响大,可由88 nm(乙酸香茅酯)变化到556 nm(苯乙醇)。对香茅醇的包埋率最高,可达到19. 8%,在常温下保存50 d后香料保留率可保持69. 39%以上,具有良好的缓释性能,同时由于PDA对紫外及可见光有一定的吸收,因此可以为光敏性或光毒性香料的应用提供进一步的光屏蔽作用。
Using the auto-oxidation and polymerization of dopamine(DA)in an alkaline solution,a polydopamine(PDA)layer was coated on the surface of the fragrance emulsion to prepare a PDA nanocapsules of fragrance.The coating property and sustained release effects of PDA on different fragrance were compared.It is found that benzyl alcohol,citronella,ethyl acetate and citronella acetate can be encapsulated inside the PDA nanocapsules,while phenyl acetaldehyde and citronellal can t be coated due to the Maillard reaction with dopamine monomer.The results of field emission scanning electron microscope(SEM)and dynamic laser light reflection(DLS)show that the fragrance nanocapsules are basically spherical and evenly distributed.The fragrance types have a great influence on the particle size,which can be changed from 88 nm(citronella acetate)to 556 nm(benzyl alcohol).The amount of fragrance encapsulated and the released behavior were investigated by both thermogravimetric analysis(TGA)and gas chromatography(GC).It is shown that the embedding rate of citronella is the highest,reaching 19.8%.After 50 days of storage at room temperature,the retention rate of the fragrance can be maintained above 69.39%,with good sustained release property.The PDA nanocapsules can provide further light screening for the photosensitizing or phototoxic fragrances owing to the ability of PDA to absorb ultraviolet and visible light.
作者
王久标
储鸿
WANG Jiu-biao;CHU Hong(School of Chemical&Material Engineering,Jiangnan University,Wuxi,Jiangsu 214122,China)
出处
《日用化学工业》
CAS
CSCD
北大核心
2018年第10期582-588,594,共8页
China Surfactant Detergent & Cosmetics
关键词
香料
乳液
纳米胶囊
包埋
缓释
光屏蔽
fragrance
emulsion
nanocapsules
encapsulated
sustained release
ultraviolet screen
