化学学报 ›› 2016, Vol. 74 ›› Issue (7): 593-596.DOI: 10.6023/A16030160 上一篇    下一篇

研究论文

反应型比例荧光探针检测多巴胺

赵振盛a, 郭旭东a, 李沙瑜a, 杨国强a,b   

  1. a. 中国科学院化学研究所 北京 100190;
    b. 中国科学院大学 北京 100049
  • 收稿日期:2016-04-06 出版日期:2016-07-15 发布日期:2016-07-19
  • 通讯作者: 杨国强 E-mail:gqyang@iccas.ac.cn
  • 基金资助:

    项目受国家自然科学基金(Nos.21206122,21233011)资助.

Reaction-Based Ratiometric Fluorescence Probes For Dopamine Detection

Zhao Zhenshenga, Guo Xudonga, Li Shayua, Yang Guoqianga,b   

  1. a. Institute of Chemistry Chinese Academy of Sciences, Beijing 100190;
    b. University of Chinese Academy of Sciences, Beijing 100049
  • Received:2016-04-06 Online:2016-07-15 Published:2016-07-19
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 21206122, 21233011).

多巴胺是一种重要的神经递质,可调控脑功能和人体的行为反应,因此对多巴胺浓度的检测是非常重要的.合成了基于芘的荧光探针羟基(米基)(芘-1-基)硼烷(HMPB),能够在缓冲溶液中对多巴胺快速响应,并且在较低浓度下都有响应,同时具有很好的选择性.为生物体内检测多巴胺提供了一种潜在的高灵敏性、高选择性的检测方法.

关键词: 多巴胺, 荧光探针, 硼化物, 荧光光谱法, 高选择性

Dopamine (DA) is one of neurotransmitters in the human central nervous system and plays a very important role on human behavior and brain function. It is necessary to detect dopamine and determine its concentration in organism. Of all the dopamine detection methods reported, fluorescence probes exhibit high efficiency, considerate specifity and potential for real-time detection. Considering the high quantum field and strong trend to form an excimer of pyrene fluorophore, a fluorescent probe hydroxy(mesityl)(pyren-1-yl)borane (HMPB) based on pyrenyl boron compound was designed, synthesized and utilized in dopamine detection. In the phosphate buffer solution (PBS) with the aid of surfactant decyltrimethylammonium bromide, the water-insoluble HMPB could show two fluorescent bands: a monomer band of peaked at 388 nm and an excimer band peaked at 484 nm. The solubility of HMPB improved after addition of DA because it could react with HMPB to form a new compound HMPB-DA and it is better to dissolve in water. The excimer pyrenyl, therefore, gradually dissociated to generate monomer pyrenyl. Accordingly, as the addition of DA, fluorescent intensity at 484 nm (I484 nm) decreased, while intensity at 388 nm (I388 nm) increased. Within 10 min, the fluorescence intensity reached saturation and the ratio of I388 nm to I484 nm have great changed after adding dopamine. HMPB exhibited significant fluorescent response when the concentration range of DA is 10 nmol/L to 600 nmol/L in 10 min, which matched the physiologic concentration of DA. The ratio of I388 nm to I484 nm could be utilized to determine the concentration of dopamine. The detection limit of HMPB was as low as 14.6 nmol/L. HMPB showed no response to common amino acids, saccharides, proteins, ions, catecholamin and other bioactive molecules, even if the interference molecules were at high concentrations. Meanwhile, HMPB can be used to detect dopamine in urine of organisms. With fast response, high sensitivity and accuracy, HMPB represented considerable potential to act as a DA detector in physiological environment, which could become a promising tool in biochemistry, molecular biology and diagnostics investigation.

Key words: dopamine, fluorescent probe, boron compound, spectrofluorimetry, high selectivity