Citation: Bin Feng, Yingli Zhu, Jiaxin Wu, Xueyan Huang, Rong Song, Liu Huang, Xueping Feng, Wenbin Zeng. Monitoring intracellular pH fluctuation with an excited-state intramolecular proton transfer-based ratiometric fluorescent sensor[J]. Chinese Chemical Letters, ;2021, 32(10): 3057-3060. doi: 10.1016/j.cclet.2021.03.074 shu

Monitoring intracellular pH fluctuation with an excited-state intramolecular proton transfer-based ratiometric fluorescent sensor

Bin Feng ^{a, b, c} ,
Yingli Zhu ^{a, b, c} ,
Jiaxin Wu ^{a, b, c} ,
Xueyan Huang ^{a, b, c} ,
Rong Song ^{a, b, c} ,
Liu Huang ^{a, b, c} ,
Xueping Feng ^d ,
Wenbin Zeng ^{a, b, c, *,}

a.
Xiangya School of Pharmaceutical Sciences, Central South University, Changsha 410013, China
b.
The Molecular Imaging Research Center, Central South University, Changsha 410013, China
c.
Hunan Key Laboratory of Diagnostic and Therapeutic Drug Research for Chronic Diseases, Central South University, Changsha 410013, China
d.
Xiangya Hospital, Central South University, Changsha 410013, China

wbzeng@csu.edu.cn

Received Date: 3 February 2021
Revised Date: 25 March 2021
Accepted Date: 26 March 2021
Available Online: 30 March 2021

Figures(6)

Intracellular pH is a key parameter related to various biological and pathological processes. In this study, a ratiometric pH fluorescent sensor ABTT was developed harnessing the amino-type excited-state intramolecular proton transfer (ESIPT) process. Relying on whether the ESIPT proceeds normally or not, ABTT exhibited the yellow fluorescence in acidic media, or cyan fluorescence in basic condition. According to the variation, ABTT behaved as a promising sensor which possessed fast and reversible response to pH change without interference from the biological substances, and exported a steady ratiometric signal (I₄₇₈/I₅₄₆). Moreover, due to the ESIPT effect, large Stokes shift and high quantum yield were also exhibited in ABTT. Furthermore, ABTT was applied for monitoring the pH changes in living cells and visualizing the pH fluctuations under oxidative stress successfully. These results elucidated great potential of ABTT in understanding pH-dependent physiological and pathological processes.
- Excited-state intramolecular proton transfer,
- Intracellular pH,
- Sulfonamide,
- Ratiometric sensor,
- Fluorescent imaging
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