Interaction between cyanine dye IR-783 and polystyrene nanoparticles in solution

Magnetic Resonance in Chemistry : MRC
Yunzhi ZhangLeah B Casabianca

Abstract

The interactions between small molecule drugs or dyes and nanoparticles are important to the use of nanoparticles in medicine. Noncovalent adsorption of dyes on nanoparticle surfaces is also important to the development of nanoparticle dual-use imaging contrast agents. In this work, solution-state NMR is used to examine the noncovalent interaction between a near-infrared cyanine dye and the surface of polystyrene nanoparticles in solution. Using 1D proton NMR, we can approximate the number of dye molecules that associate with each nanoparticle for different sized nanoparticles. Saturation-Transfer Difference NMR was also used to show that protons near the positively charged nitrogen in the dye are more strongly associated with the negatively charged nanoparticle surface than protons near the negatively charged sulfate groups of the dye. The methods described here can be used to study similar drug or dye molecules interacting with the surface of organic nanoparticles.

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Citations

Nov 28, 2018·The Journal of Physical Chemistry Letters·Yunzhi Zhang, Leah B Casabianca
Dec 29, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Hui Xu, Leah Beck Casabianca

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