医用色素姜黄素在含巨大囊泡和三重FRET技术的咪唑基表面活性离子液体中的超快动力学和白光发生机制。
Ultrafast Dynamics of the Medicinal Pigment Curcumin inside the Imidazolium Surface Active Ionic Liquid Containing Giant Vesicles and White Light Generation via Triple-FRET Technique.
发表日期:2023 Aug 11
作者:
Nanigopal Bera, Souvik Layek, Shashwata Pramanik, Pratyush Kiran Nandi, Ritwik Hazra, Nilmoni Sarkar
来源:
ANTIOXIDANTS & REDOX SIGNALING
摘要:
天然存在的黄色多酚类药用色素姜黄素在激发态下表现出超快动力学。这些超快动力学受系统环境的刚性影响很大。本研究揭示了姜黄素在咪唑表面活性离子液体(SAIL)1-十六烷基-3-甲基咪唑盐酸盐([C16mim]Cl)胶束内、巨大囊泡内引入山梨醇单酯(Span 20和Span 80)后的超快激发态分子内氢原子转移(ESIHT)(与抗氧化机制有关)和溶剂化动力学。有趣的是,含有Span 20的短碳链形成较小、不那么刚性的囊泡,而含有Span 80的长碳链在与[C16mim]Cl组装后形成较大、更刚性的巨大囊泡。ESIHT和溶剂化动力学在刚性囊泡中的Span 80中较慢,而在较不刚性的Span 20中较快。最后,我们建立了一个三组分荧光共振能量传递(Triple-FRET)系统,在胶束和巨大囊泡中产生白光(WL)。在特定浓度的这些染料与特定自组装体系中的组合下,由于三组分FRET现象,WL产生。其中,疏水性染料1,6-二苯基-1,3,5-己三烯(DPH)作为给体,亲水性抗癌药物盐酸多柔比星(DOX)作为受体,并伴随中间给体姜黄素。
The naturally occurring yellow polyphenolic medicinal pigment curcumin shows ultrafast dynamics in the excited states. These ultrafast dynamics are strongly influenced by the rigidity of the environments of the systems. The present investigation unveils the ultrafast excited-state intramolecular hydrogen atom transfer (ESIHT) (which is involved in the antioxidant mechanism) and the solvation dynamics of curcumin inside the imidazolium surface active ionic liquid (SAIL), 1-hexadecyl-3-methylimidazolium chloride ([C16mim]Cl) micelle, and giant vesicles after introducing sorbitan monoesters (Span 20 and Span 80) in the aqueous medium. Interestingly, the short hydrocarbon chain containing Span 20 forms smaller, less rigid vesicles, and the long hydrocarbon chain containing Span 80 forms larger, more rigid giant vesicles after being assembled with [C16mim]Cl. The ESIHT and the solvation dynamics are slower in Span 80, containing rigid vesicles, than that in Span 20, comprising less rigid vesicles. Finally, we have established a three-component fluorescence resonance energy transfer (Triple-FRET) system to generate white light (WL) in the micelle and giant vesicles. Here the hydrophobic dye 1,6-diphenyl-1,3,5-hexatriene (DPH) acts as the donor, and the hydrophilic anticancer drug doxorubicin hydrochloride (DOX) serves as the acceptor along with the intermediate donor, curcumin. At a specific combination of the concentrations of these dyes in a particular self-assembled system, WL is generated due to the triple-FRET phenomena.