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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

A mitochondria-targeted probe containing multi-rotors for visualizing the viscosity change in living cells

Shuting Shen A # , Kun Yu A # , Yaxuan Wang A # , Zhiyu Wang A , Lei Hu A * and Hui Wang https://orcid.org/0000-0002-5253-1204 A *
+ Author Affiliations
- Author Affiliations

A Department of Chemistry, Anhui provincial engineering research center for polysaccharide drugs, Wannan Medical College, Wuhu 241002, People’s Republic of China.

* Correspondence to: hulei@wnmc.edu.cn, wanghias@126.com

Handling Editor: Pall Thordarson

Australian Journal of Chemistry 75(6) 381-386 https://doi.org/10.1071/CH22018
Submitted: 26 January 2022  Accepted: 3 April 2022   Published: 30 May 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing.

Abstract

Fluorescent probes based on molecular rotor are expected to be a powerful tool to uncover the relationship between intracellular viscosity and organelle functions as well as related diseases. Herein, a fluorophore MV-indol containing multiple rotors was constructed by linking triphenylamine group and benzindole unit. It was found that MV-indol can quantitatively detect viscosity with a high selectivity and a 75-fold enhancement in quantum yield (QY). Moreover, the viscosity-sensitive property could be ascribed to the inhibition of molecular rotation and restriction of twisted intramolecular charge transfer (TICT) in a high-viscous environment, which was confirmed by time-dependent density functional theory (TD-DFT). Importantly, we also demonstrated that MV-indol can precisely localize in mitochondria and monitor the change of mitochondrial viscosity at the cellular level.

Keywords: benzindole, bioimaging, fluorescent probe, mitochondria, molecular rotor,  TD‐DFT, triphenylamine, viscosity.


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