journal article·2015-12Open access

Self-assembled multicolor nanoparticles based on functionalized twistacene dendrimer for cell fluorescent imaging

Xuemin Zhang, Shengliang Li, Zhenying Liu, Shu Wang, Jinchong Xiao

NPG Asia Materials· Volume 7· Issue 12

Abstract

A series of twistacene-functionalized dendrimers were successfully synthesized and characterized. The model molecule DBPy has a twisted configuration with a torsional angle of 27.69° between pyrene and naphthalene units. The resulting compounds TPPh, TTPy, OTPy and TOPhP can self-assemble into organic nanoparticles through re-precipitation method and emit strong blue, cyan, green and red fluorescence in water, respectively. Additionally, the obtained multicolor nanoparticles showed low cytotoxicity and good photostability that selectively flow into the membrane and cytoplasm of HeLa cells, indicating the feasibility and efficiency in fluorescence imaging. This study might be a new avenue for the design of three-dimensional branched conjugated molecule and specific location imaging in living cell. Chinese researchers have developed a three-dimensional probe with tunable fluorescence emissions for improved imaging of living cells. Dendrimers are emerging polymer materials that grow into globular spheres through a branching process. Jinchong Xiao from the Hebei University and Shu Wang from the Beijing National Laboratory for Molecular Sciences and co-workers conjectured that combining the soft material properties of dendrimers with ‘twistacenes’ — a series of fused benzene rings that controllably emit light — could generate versatile imaging probes with greater affinity for intracellular positions. By tweaking molecular structures and self-assembling the dendrimers into larger organic nanoparticles in water, the researchers synthesized different probes with strong blue, cyan, green and red fluorescence emissions. Cell-based experiments revealed that the team's conjecture was correct: multicoloured nanoparticles were imaged as selectively entering HeLa cell membranes and cytoplasms while displaying minimal cytotoxic side-effects. A series of twistacene-functionalized dendrimers were successfully synthesized and characterized. They can self-assemble into organic nanoparticles through re-precipitation method and emit blue, cyan, green and red fluorescence in water. These multicolor nanoparticles showed low cytotoxicity and good photostability, which could be used for fluorescence imaging of living cells.
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Research context

OpenAlex topics: Supramolecular Self-Assembly in Materials · Luminescence and Fluorescent Materials · Dendrimers and Hyperbranched Polymers

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

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