期刊
ANALYTICAL METHODS
卷 13, 期 29, 页码 3218-3226出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ay00825k
关键词
-
资金
- National Natural Science Foundation of China [NSFC 51403111, 11774188]
Thermo-responsive nanogels with fluorescent properties were prepared using a simple method and utilized for cell apoptosis and hydrogen sulfide detection. The nanogels show bright photoluminescence and outstanding thermo-responsive properties, making them suitable for various biomedical applications.
Thermo-responsive nanogels, poly(NIPAM-AAM) were prepared by a facile method of free radical one-pot precipitation based on monomeric N-isopropylacrylamide (NIPAM). At the same time, surface carboxyl group-modified fluorescent conjugated polymer nanoparticles (PNPs(-COOH)) were immobilized in the nanogel networks by hydrogen bonding to show bright green photoluminescence and outstanding thermo-responsive properties with a typical two-phase Tai Chi structure. Poly(NIPAM-AAm)-PNPs(-COOH) displays a larger change of hydrodynamic diameter (D-h) and a reversible volume transition from similar to 150 nm at 40 degrees C to similar to 1.0 mu m at 4 degrees C. The change will cause apoptosis of cells to finish flash chill treatment. Meanwhile, the fluorescence of poly(NIPAM-AAm)-PNPs(-COOH) demonstrates reversible quenching and recovery with the expansion and collapse of the nanogel network induced by temperature changes. In addition, when adding Fe3+, the fluorescence of poly(NIPAM-AAm)-PNPs(-COOH) can be quenched due to the chelation between the PNPs(-COOH) and Fe3+ and then recovered in the presence of hydrogen sulfide because the chelate is broken; this was attributed to the stronger affinity between Fe3+ and S2-. Therefore, the fluorescence nanoplatform, Fe3+/poly(NIPAM-AAm)-PNPs(-COOH), was successfully used to detect endogenous hydrogen sulfide in living A549 cells.
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