Author: ["Zheng-Jiang Zhu","Yi-Cheun Yeh","Rui Tang","Bo Yan","Joshua Tamayo","Richard W. Vachet","Vincent M. Rotello"]
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Abstract
Quantum dots are highly fluorescent and photostable, making them excellent tools for imaging. When using these quantum dots in cells and animals, however, intracellular biothiols (such as glutathione and cysteine) can degrade the quantum dot monolayer, compromising function. Here, we describe a label-free method to quantify the intracellular stability of monolayers on quantum dot surfaces that couples laser desorption/ionization mass spectrometry with inductively coupled plasma mass spectrometry. Using this new approach we have demonstrated that quantum dot monolayer stability is correlated with both quantum dot particle size and monolayer structure, with appropriate choice of both particle size and ligand structure required for intracellular stability. Intracellular biothiols can degrade nanoparticle monolayers, compromising the function of these potentially promising tools. Here, we describe a label-free method for quantifying the intracellular stability of quantum dot monolayers, using laser desorption/ionization mass spectrometry coupled with inductively coupled plasma mass spectrometry. Cite this article
Zhu, ZJ., Yeh, YC., Tang, R. et al. Stability of quantum dots in live cells. Nature Chem 3, 963–968 (2011). https://doi.org/10.1038/nchem.1177 