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A diboronic acid fluorescent sensor for selective recognition of D-ribose via fluorescence quenching

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Abstract

Boronic acids have been widely developed as fluorescent sensors for recognition of carbohydrates, especially D-glucose, ions, catechol compounds and so on. However, few D-ribose selective boronic acid sensors have been reported, and their poor water solubility brings a lot of inconvenience to their applications. Herein we report a novel water-soluble sensor, (4-(4-((3-boronobenzamido)propyl)carbamoyl)quinolin-2-yl)boronic acid (sensor 6). The fluorescence of sensor 6 decreased by 50% when combined with 0.0146 M of D-ribose, while it increased when combined with D-mannose, D-galactose, D-fructose, D-glucosamine, sialic acid, D-sorbitol and D-arabinose, and fluorescence change was not obvious after binding to D-glucose. Therefore, this sensor may serve as a fluorescence quenching sensor for D-ribose. By processing the fluorescence binding data using the Benesi–Hildebrand equation, we found that the reciprocal of fluorescence intensity quenching showed a good linear relationship with the reciprocal of D-ribose concentration, indicating that the binding ratio of sensor 6 to D-ribose is 1 : 1. In pH titration experiments, the quenched fluorescence was most pronounced at pH 7.4, indicating that the sensor may serve to recognize D-ribose at physiological pH 7.4. Subsequently, D-ribose can also cause sensor fluorescence quenching in rabbit plasma and the rabbit plasma fluorescence interference can be excluded. These studies indicate that sensor 6 is a promising tool for detecting D-ribose.

Graphical abstract: A diboronic acid fluorescent sensor for selective recognition of d-ribose via fluorescence quenching

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Publication details

The article was received on 10 Dec 2018, accepted on 07 Feb 2019 and first published on 08 Feb 2019


Article type: Paper
DOI: 10.1039/C8NJ06229C
Citation: New J. Chem., 2019, Advance Article

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    A diboronic acid fluorescent sensor for selective recognition of D-ribose via fluorescence quenching

    H. Wang, G. Fang, H. Wang, J. Dou, Z. Bian, Y. Li, H. Chai, Z. Wu and Q. Yao, New J. Chem., 2019, Advance Article , DOI: 10.1039/C8NJ06229C

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