Application of a near-infrared xanthene fluorescent dye in fluorescent labeling of Schistosoma japonicum adults
A fluorescent dye and fluorescent labeling technology is applied in the application field of near-infrared xanthene fluorescent dyes in the fluorescent labeling of schistosomiasis adults, and can solve the problem of inability to long-term fluorescent observation, fluorescent interference, poor hydrophilicity of organic small molecule fluorescent dyes, etc. problem, to achieve the effect of good light penetration performance and high signal-to-noise ratio
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Embodiment 1
[0058] Mix 5.33g (40mmol) of 2-methylbenzoxazole with 20mL of toluene, then add 6.86g (44mmol) of ethyl iodide, and react at 120°C for 24h; cool to room temperature, and filter under reduced pressure to obtain a crude extract. Washed three times with toluene (10 mL×3)) to obtain compound 2 with a yield of 85%. 1 H NMR (400MHz, MeOD) δ8.19–7.93 (m, 2H), 7.80 (dd, J = 9.3, 5.5Hz, 2H), 4.67 (q, J = 7.4Hz, 2H), 3.13 (s, 3H) ,1.61(s,3H); Exact Mass: C 10 h 12 NO + , 162.0913, ESI-MS: m / z, 162.1.
[0059] Compound 22.89g (1mmol) and N,N-diphenylformamidine 1.93g (1mmol) were mixed, and a solid-phase melting reaction was carried out at 140°C for 0.5h; a mixed solvent of dichloromethane and methanol was used as the eluent ( The volume ratio of dichloromethane and methanol in the eluent is 20:1) The obtained crude product was separated by column chromatography to obtain compound 3 with a yield of 65%. 1 H NMR (400MHz, CDCl 3 )δ11.72(d,J=14.0Hz,1H),8.64(dd,J=14.1,12.1Hz,1H),7.61(d...
Embodiment 2
[0063] The near-infrared xanthene fluorescent dye (NIR-RB) having the structure shown in formula I is carried out ultraviolet absorption spectrum and fluorescence spectrum test, specifically as follows:
[0064] Mix NIR-RB with ethanol to obtain 1mmol / L NIR-RB ethanol mother liquor, then dilute with ethanol to obtain 10μmol / L NIR-RB dilution, carry out ultraviolet absorption spectrum and fluorescence spectrum on the NIR-RB dilution In the test, the scanning range of the ultraviolet absorption spectrum measurement is 500-850nm; the excitation wavelength of the fluorescence spectrum measurement is 620nm, and the emission spectrum range is 640-850nm.
[0065] figure 2 It is the ultraviolet absorption spectrum and the fluorescence spectrum of the NIR-RB dilution, by figure 2 It can be seen that the emission peak of NIR-RB is located in the near-infrared region of 650-850 nm.
Embodiment 3
[0067] The cell fluorescence imaging of NIR-RB was detected, as follows:
[0068] (1) Reagents and materials
[0069]Dimethyl sulfoxide (AR) was purchased from Aladdin Chemical Reagent Co., Ltd., RPMI 1640 culture medium was purchased from Thermo Fisher Scientific, and human cervical cancer cells (HeLa) were purchased from Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences. Place.
[0070] (2) Fluorescence imaging of human cervical cancer cells
[0071] Human cervical cancer cells were cultured in RPMI 1640 medium containing 10% fetal bovine serum at 37°C, 5% CO 2 and 95% air atmosphere; under the condition of excitation wavelength of 635nm, the fluorescent labeling of cultured human cervical cancer cells was detected by OLYMPUS FV1000 laser confocal fluorescence microscope, and the fluorescent signal of 650-750nm was collected Perform fluorescence imaging.
[0072] image 3 Fluorescent imaging of human cervical cancer cells, by image 3 It ...
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