光漂白
荧光
纳米颗粒
生物分子
胶体金
费斯特共振能量转移
光漂白后的荧光恢复
化学
色氨酸
光化学
核黄素
荧光寿命成像显微镜
生物物理学
纳米技术
材料科学
氨基酸
生物化学
光学
物理
生物
作者
Jelena Pajović,Radovan Dojčilović,Slávka Kaščáková,Matthieu Réfrégiers,Dušan K. Božanić,Vladimir Djoković
标识
DOI:10.1016/j.colsurfb.2023.113340
摘要
Gold nanoparticles were functionalized by amino acid tryptophan and vitamin riboflavin - a resonance energy transfer (RET) pair of biomolecules. The presence of the gold nanoparticles resulted in 65% increase in RET efficiency. Because of enhanced RET efficiency, the photobleaching dynamics of the fluorescent molecules at the surface of the nanoparticles is different from that of molecules in solution. The observed effect was used for detection of the functionalized nanoparticles within biological material rich with autofluorescent species. Synchrotron radiation deep-ultraviolet fluorescence microscopy is used to study the photobleaching dynamics of the fluorescence centers within human hepatocellular carcinoma Huh7.5.1 cells incubated with the nanoparticles. The fluorescent centers were classified according to their photobleaching dynamics, which enabled the discrimination of the cell areas where the accumulation of the nanoparticles takes place, even though the particles were smaller than the spatial resolution of the images.
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