title: Ratiometric Nanothermometer Based on Rhodamine Dye-Incorporated F127-Melamine-Formaldehyde Polymer Nanoparticle: Preparation, Characterization, Wide-Range Temperature Sensing, and Precise Intracellular Thermometry.
abstract: A series of fluorescent nanothermometers (FTs) was prepared with Rhodamine dye-incorporated Pluronic F-127-melamine-formaldehyde composite polymer nanoparticles (R-F127-MF NPs). The highly soluble Rhodamine dye molecules were bound with Pluronic F127 micelles and subsequently incorporated in the cross-linked MF resin NPs during high-temperature cross-link treatment. The morphology and chemical structure of R-F127-MF NPs were characterized with dynamic light scattering, electron microscopy, and Fourier-transform infrared (FTIR) spectra. Fluorescence properties and thermoresponsivities were analyzed using fluorescence spectra. R-F127-MF NPs are found to be monodispersed, presenting a size range of 88-105 nm, and have bright fluorescence and high stability in severe treatments such as autoclave sterilization and lyophilization. By simultaneously incorporating Rhodamine B and Rhodamine 110 (as reference) dyes at a doping ratio of 1:400 in the NPs, ratiometric FTs with a high sensibility of 7.6%·°C(-1) and a wide temperature sensing range from -20 to 110 °C were obtained. The FTs exhibit good stability in solutions with varied pH, ionic strengths, and viscosities and have similar working curves in both intracellular and extracellular environments. Cellular temperature variations in Hela cells during microwave exposure were successfully monitored using the FTs, indicating their considerable potential applications in the biomedical field.
authors.affiliation: Key Laboratory of Biomedical Information Engineering of Education Ministry, School of Life Science and Technology Xi'an Jiaotong University Xi'an, 710049, People's Republic of China.
authors.forename: Youshen
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Key Laboratory of Biomedical Information Engineering of Education Ministry, School of Life Science and Technology Xi'an Jiaotong University Xi'an, 710049, People's Republic of China.
authors.forename: Jiajun
authors.initials: J
authors.lastname: Liu
authors.affiliation: Key Laboratory of Biomedical Information Engineering of Education Ministry, School of Life Science and Technology Xi'an Jiaotong University Xi'an, 710049, People's Republic of China.
authors.forename: Jingwen
authors.initials: J
authors.lastname: Ma
authors.affiliation: Key Laboratory of Biomedical Information Engineering of Education Ministry, School of Life Science and Technology Xi'an Jiaotong University Xi'an, 710049, People's Republic of China.
authors.forename: Yongchun
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Key Laboratory of Biomedical Information Engineering of Education Ministry, School of Life Science and Technology Xi'an Jiaotong University Xi'an, 710049, People's Republic of China.
authors.forename: Ya
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Key Laboratory of Biomedical Information Engineering of Education Ministry, School of Life Science and Technology Xi'an Jiaotong University Xi'an, 710049, People's Republic of China.
authors.forename: Daocheng
authors.initials: D
authors.lastname: Wu
mesh_terms: D005456:Fluorescent Dyes / Q000737:chemistry*; D005557:Formaldehyde / Q000737:chemistry; D006367:HeLa Cells; D006801:Humans; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation*; D020442:Poloxamer / Q000737:chemistry; D011095:Polyethylenes; D011108:Polymers / Q000737:chemistry*; D011126:Polypropylenes; D012235:Rhodamines / Q000737:chemistry*; D013696:Temperature; D062125:Thermometry / Q000295:instrumentation*; D014227:Triazines / Q000737:chemistry
chemical_list: D005456:Fluorescent Dyes; D011095:Polyethylenes; D011108:Polymers; D011126:Polypropylenes; D012235:Rhodamines; D014227:Triazines; D020442:Poloxamer; D005557:Formaldehyde; C078661:UCON 50-HB-5100; C011907:melamine
keywords: intracellular thermometry; melamine-formaldehyde resin; ratiometric thermometer; rhodamine dyes; wide range temperature sensing