A kind of fluorescent conjugated compound and its application
A conjugated compound and fluorescence technology, applied in the field of medicine, can solve the problems of difficulty in knowing the stage and degree of disease development, environmental radioactive pollution, high cost, etc., and achieve the effects of stable biological characteristics, rapid diagnosis, and high stability
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Embodiment 1
[0047] Example 1 Fluorescent molecules (sodium fluorescein, emission wavelength 525nm, green fluorescent dye) and free fatty acids (octadecenoic acid: monounsaturated fatty acid at carbon 18) are generated by connecting C-O at the carbon 9 position of octadecenoic acid The conjugated compound (referred to as Fluorescein sodium-FA, the same below), the generated Fluorescein sodium-FA has a fluorescence similar to that of the original fluorescein molecule, and its preparation method is as follows:
[0048] (1) Under nitrogen protection, mix sodium fluorescein and mercaptopropionic acid in a molar ratio of 1:0.13, stir 0.1mol sodium fluorescein and 0.13mol mercaptopropionic acid at 50°C until a solution is formed, and add fluorescent Hafnium(IV) chloride tetrahydrofuran complex (1:2) with a molar mass of 0.2‰ (0.02mmol) of plain sodium and 20ml of toluene were connected to the water separator, and the water was separated and refluxed at 130°C for 16 hours. After the reaction was c...
Embodiment 2
[0073] Example 2 The fluorescent conjugated compound Fluorescein sodium-FA prepared in Example 1 was prepared into an oral powder and administered to the human body orally. After oral administration, the fluorescent conjugated compound enters human cells through active transport and accumulates in the cells Not metabolized.
[0074] After 10 minutes of oral administration, fluorescence endoscopy was used for detection. Due to the difference in the absorption or metabolism of fluorescein-labeled free fatty acids between normal cells and tumor cells, the absorption fluorescence intensity of normal cell tissue was 3.4 times that of tumor tissue. In the obtained fluorescent imaging image, the dark area shows the tumor growth and infiltration range, which can distinguish tumor cells from normal cells, so as to find precancerous disease cells or cancer cells.
Embodiment 3
[0075] Example 3 The staining agent made of the fluorescent conjugated compound Fluorescein sodium-FA prepared in Example 1 was directly sprayed on the site to be observed (in colorectal cancer), and under the confocal endoscope, the Fluorescein sodium-FA was sprayed 1 The arrangement and atypia of the cells can be clearly displayed in minutes. Compared with the traditional fluorescein sodium, which needs intravenous injection into the human body, direct spraying of Fluorescein sodium-FA can significantly reduce the side effects of patients after use, and the direct spraying effect is rapid It speeds up the work efficiency of endoscopists and is suitable for intense and busy clinical work. Acridine yellow, which was used in clinical direct spraying in previous studies, has been banned by the FDA because of its carcinogenicity. Direct spraying of Fluorescein sodium-FA can specifically display the tumor site through the "dark area" (less absorbed fatty acid). The degree and stag...
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