Naphthalic Anhydride-Based Water-Soluble Fluorescent Probe: Synthesis and Application in Cell Imaging
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摘要: 设计并合成了以螺芴刚性结构为骨架、基于萘酸酐基团的探针分子（ 3 、 6 和 9 ）。将萘酰亚胺荧光团转化为萘酸酐荧光团，利用酸酐基团在碱性条件下的水解反应，将萘酸酐基团转化为带电荷的羧酸根进而提高探针分子的水溶性，同时酸酐基团在有机溶剂中的溶解性也有利于探针分子的分离纯化过程。随着水溶液pH值的增大，探针分子的吸收光谱起峰蓝移，探针溶解性增加，表明探针的萘酸酐基团已经向羧酸根转变。探针分子 3 、 6 、 9 在细胞成像中皆成功染色，有效消除了背景信号干扰问题，说明通过将萘酰亚胺转化为萘酸酐提高了现有荧光团的水溶性。Abstract: The development of water-soluble fluorescent probes has become a topical research area for environmental and biological applications. Water solubility is desired for fluorescent probes to function in aqueous media. The introduction of water-soluble groups to conventional organic fluorophores is challenging in terms of preparation and purification. In this paper, fluorescent probes 3 , 6 and 9 based on spirobilfuorene skeleton were designed and synthesized, featuring naphthalene anhydride functionality. These compounds were prepared by hydrolysis of corresponding molecules bearing naphthalenedimide, which is a common electron acceptor often used in fluorophores. The anhydride group not only allows these compounds to be separated and purified in common organic solvents, such as chloroform and tetrahydrofuran, but also imparts enough water solubility. The anhydride group undergoes hydrolysis upon exposing to alkaline conditions in aqueous media, evidenced by a hypochromic-shift in UV-vis absorption spectra with increasing pH. For example, the ratio of absorption at 365 nm to 472 nm of compound 3 in water, elevated from 2.5 at pH = 2.0 continuously to 3.4 at pH = 11.0. The conversion from charge neutral anhydride form to negatively charged carboxylate form switches the solubility of such probes to more polar media. These probes displayed fluorescence emission in the visible range, at 519, 440, and 504 nm, respectively. After incubation Hela cells with these probes at 10 μmol/L for 30 min, confocal microscopy displays clear cell contours with minimal noise, demonstrating efficiency of our strategy.
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Key words:
- fluorescent probe /
- cell imaging /
- spiro-bifluorene /
- anhydride /
- naphthalimide
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图 2 化合物3、6、9在二甲基亚砜中的紫外-可见吸收光谱（a）和荧光发射光谱（b）
Figure 2. UV-vis absorption spectra (a) and fluorescence emission spectra (b) of compounds 3, 6, 9 in dimethyl sulfoxide
图 3 （a）化合物3在不同pH下的紫外-可见吸收曲线；（b）化合物3在不同pH下A365/A472的比值；化合物3、6、9在水中（c）和在PBS缓冲溶液中（d）的紫外-可见吸收光谱
Figure 3. (a) UV-Vis absorption spectra of compound 3 at different pH; (b)A365 / A472 ratio at different pH of compound 3; Normalized UV-Vis absorption spectra of compound 3, 6, 9 in water (c) and in PBS buffer solution (d)
图 4 化合物3、6、9对Hela细胞的共聚焦成像
Figure 4. Confocal imaging of Hela cells with compound 3, 6 and 9
表 1 化合物3、6、9在二甲基亚砜中的紫外-可见吸收光谱和荧光发射光谱的表征数据
Table 1. UV-vis absorption and fluorescence emission characterization data of compounds 3, 6, 9 in dimethyl sulfoxide
Compound UV-vis absorption Fluorescence emission λmax/nm ε/[105 L·mol−1·cm−1] λemi /nm λex /nm Φ 3 441 0.14 519 431 0.51 6 356 0.28 440 346 0.07 9 382 0.53 504 372 0.23 λ—Absorption wave length; ε—Extinction coefficient; Φ—Quantum fluorescence yield 
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