Coumarin-modified fluorescent microcapsules and their photo-switchable release property

Coumarin-modified fluorescent microcapsules and their photo-switchable release property
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香豆素修饰荧光微胶囊及其光控释放性能

DOI:
10.1016/j.colsurfa.2017.02.077
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发表时间:
2017-06
期刊:
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子:
--
通讯作者:
Jie Wei
Jie Wei
中科院分区:
其他
文献类型:
--
作者:
Nan Jiang;Yu Cheng;Jie Wei

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在本研究中,我们提出了一种基于香豆素修饰壳的光响应型微胶囊。香豆素基团首先在化学计量的基础上与季戊四醇反应,然后与可聚合的异氰酸酯基团醚化得到壳体材料。为了稳定壳层结构,我们通过界面聚合和365 nm紫外光照射制备了香豆素修饰微胶囊(CMM)。用扫描电子显微镜和光学显微镜对微胶囊的粒径和表面形貌进行了测量。紫外光照射后,CMM的壳层由于[2+2]环化反应而表现出可变的荧光以及可逆的交联和裂解。将荧光染料2-苯胺基-6-二丁氨基-3-甲基荧烷(ODB-2)引入到微胶囊中,利用荧光显微镜和荧光分光光度计研究其控释行为。在不同的紫外光照射下,坐标测量机分别呈现出不同的“开”和“关”状态,实现了ODB-2的释放和捕获。这一结果导致了对控释性能的精确表征,这将对用于药物输送系统和信息记录装置的可切换微胶囊具有重要意义。
In this study, we propose one kind of photo-responsive microcapsule based on the coumarin-modified shell. The coumarin group firstly reacts with pentaerythritol on a stoichiometric basis and then etherifies with the polymerizable isocyanate group to obtain the shell material. To stabilize the shell structure, we fabricate coumarin-modified microcapsules (CMMs) via interfacial polymerization and 365 nm ultraviolet light irradiation. The particle size and surface morphology of microcapsules are measured by scanning electron microscopy and optical microscopy. After ultraviolet irradiation, the shell of CMMs exhibits variable fluorescence as well as reversible crosslinking and cleavage due to the [2 + 2] cyclization reaction. By introducing the fluorescent dye 2-anilino-6-dibutylamino-3-methylfluoran (ODB-2) into microcapsules, the controlled release behavior of CMMs can be measured by fluorescence microscope and fluorescence spectrophotometer. The CMMs exhibit distinct “on” state and “off” state separately under different ultraviolet light, achieving ODB-2 release and trapping. This result leads to precise characterization of controlled release property, which will be of interest in switchable microcapsules for drug delivery system and information recording device.
两亲性无规共聚物胶束内香豆素悬垂物的光诱导动态缔合
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