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Highly sensitive assay of dopamine and tyrosinase using benzoyl peroxide facilitated in-situ fluorogenic reaction

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Abstract

In this work, simple, cost efficient, highly selective and sensitive assay methods for dopamine (DA) concentration and tyrosinase (TYR) activity were established based on a benzoyl peroxide (BPO) facilitated in situ “turn-on” fluorogenic reaction between resorcinol (RS) and DA, in which BPO was introduced in the system to accelerate DA oxidation, thereby realizing a faster reaction with RS to form the fluorescent substance, azamonardine, which was verified by HPLC, 1H NMR, 13C NMR and high resolution mass spectrometry. The introduction of BPO remarkably improved the sensitivity, linearity range and response speed for assay of DA and TYR. For the determination of DA concentration, the concentration has a good linear relationship in the range of 4.0–1.2 μM, and the detection limit is as low as 0.8 nM, and it was successfully applied to measuring DA in human urine and serum samples. In addition, a fluorescent method for determining the TYR activity was further established based on the enzymatic oxidation of tyramine to DA, the detection limit is 0.0013 U mL−1. And the method was used to determine TYR in human serum and screening of TYR inhibitors.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (nos. 22074117 and 21974106).

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Correspondence to Chao-Zhan Wang.

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Ding, Y., Yang, LH., Shen, JW. et al. Highly sensitive assay of dopamine and tyrosinase using benzoyl peroxide facilitated in-situ fluorogenic reaction. Chem. Pap. 76, 4235–4244 (2022). https://doi.org/10.1007/s11696-022-02169-1

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  • DOI: https://doi.org/10.1007/s11696-022-02169-1

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