研究目的
To design and synthesize polysiloxane-based hyperbranched fluorescent materials using thiol-ene "click" chemistry and rare earth ion coordination for potential applications in cellular imaging.
研究成果
Polysiloxane-based hyperbranched polymers P1 and P2 were successfully synthesized with good refractive index and thermal stability. Coordination with rare earth ions enabled fluorescence properties suitable for cellular imaging, specifically staining the cytoplasm in HeLa cells with low cytotoxicity and good photostability, representing a novel application in biological imaging.
研究不足
The degree of branching (DB) could not be precisely determined due to complex structures. The fluorescence quantum yield in organic solvents was low (0.3%). Potential limitations in scalability and application in vivo were not fully addressed.
1:Experimental Design and Method Selection:
The study utilized thiol-ene "click" chemistry for polymerization, involving UV-initiated radical addition reactions. Rare earth ion coordination was employed to modify fluorescence properties.
2:Sample Selection and Data Sources:
Monomers used were 1,3-diethenyl-1,1,3,3-tetramethyl-disiloxane (MMvi) and trimethylolpropane tris(3-mercaptopropionic acid) ester (TTMP), with initiator 2,2-Dimethoxy-2-phenylacetophenone (DMPA). Rare earth salts Eu(NO3)3 and Tb(NO3)3 were coordinated. HeLa cells were used for biological imaging.
3:List of Experimental Equipment and Materials:
UV lamp for irradiation, NMR spectrometer (400 MHz and 100 MHz), FT-IR spectrometer, Abbe refractometer, TGA instrument, fluorescence spectrometer, confocal microscope. Materials included THF, methanol, and various chemicals as specified.
4:Experimental Procedures and Operational Workflow:
For P1 and P2 synthesis, mixtures of monomers and initiator in THF were irradiated under UV lamp for 30 minutes, followed by purification with methanol. For P1-Ln3+, P1 was mixed with rare earth salts in THF and stirred for 24 hours. Cell imaging involved incubating HeLa cells with complexes and using MTT assay for cytotoxicity.
5:Data Analysis Methods:
NMR and FT-IR for structural characterization, GPC for molecular weight, refractive index measured with Abbe refractometer, fluorescence spectra analyzed, TGA for thermal stability, and image analysis for cell studies.
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NMR Spectrometer
400 MHz
Structural characterization of polymers
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NMR Spectrometer
100 MHz
Structural characterization of polymers
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FT-IR Spectrometer
Infrared spectroscopy for functional group analysis
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Abbe Refractometer
Measurement of refractive index
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TGA Instrument
Thermogravimetric analysis for thermal stability
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Fluorescence Spectrometer
Emission and excitation spectroscopy
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Confocal Microscope
Fluorescence imaging of cells
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UV Lamp
Initiation of thiol-ene reactions
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