纳米传感器
钾
纳米颗粒
紫外线
材料科学
化学成像
介孔二氧化硅
红外线的
光子上转换
膜
纳米技术
介孔材料
化学
光电子学
光学
发光
高光谱成像
遥感
生物化学
地质学
物理
催化作用
冶金
作者
Jianan Liu,Limin Pan,Chunfeng Shang,Bin Lu,Rongjie Wu,Yun Feng,Wei-Yu Chen,Rongwei Zhang,Jiwen Bu,Zhi‐Qi Xiong,Wenbo Bu,Jiulin Du,Jianlin Shi
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2020-04-17
卷期号:6 (16)
被引量:57
标识
DOI:10.1126/sciadv.aax9757
摘要
Potassium ion (K+) concentration fluctuates in various biological processes. A number of K+ probes have been developed to monitor such fluctuations through optical imaging. However, the currently available K+ probes are far from being sensitive enough in detecting physiological fluctuations in living animals. Furthermore, the monitoring of deep tissues is not applicable because of short-wavelength excitation prevailingly used so far. Here, we report a highly sensitive and selective nanosensor for near-infrared (NIR) K+ imaging in living cells and animals. The nanosensor is constructed by encapsulating upconversion nanoparticles (UCNPs) and a commercial K+ indicator in the hollow cavity of mesoporous silica nanoparticles, followed by coating a K+-selective filter membrane. The membrane adsorbs K+ from the medium and filters out interfering cations. The UCNPs convert NIR to ultraviolet light, which excites the K+ indicator, thus allowing the detection of the fluctuations of K+ concentration in cultured cells and intact mouse brains.
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