Abstract
Laccases play a vital role in some physiological processes, for example in morphogenesis, carbon cycle, and defense against parasitism. So, designing a high-sensitivity accurate method is essential for researchers. In this study, a simple fluorescence method based on the function of carbon nitride (g-C3N4) by dopamine is synthesized. For the design of this sensor, carbon nitride (g-C3N4) is initially synthesis by using a simple method, which is carried out by heating melamine at 550 °C for 3 h and modifying it with dopamine by a linker such as glutaraldehyde. However, the g-C3N4–Dopa produced by this method, with an excitation wavelength of 330 nm, has a fluorescence emission at 466 nm. When laccase and g-C3N4–Dopa were mixed, dopamine with redox property was oxidized to dopaquinone; this causes the phenomenon of photoinduced electron transfer (PET) process between g-C3N4 and the dopaquinone. Hence, fluorescence quenching occurs due to this phenomenon. As a result of these discussions, a sensor for the laccase activity was designed based on the fluorescence quenching degree, supporting a linear range of 0.0–400.0 U L−1 with the detection limit of 2.0 U L−1. Using this sensor, the activity of the laccase enzyme in the human serum samples is measured.
Graphic abstract
Dopamine-functionalized carbon nitride was prepared and utilized for the highly sensitive detection of laccases activity.
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17 December 2020
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The authors gratefully acknowledge the Medical Cellular and Molecular Research Center of Golestan University of Medical Sciences (Grant Number: 111255) for the financial support.
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Arabi, M.S., Karami, C., Taher, M.A. et al. Fluorescence detection of laccases activity by the photoinduced electron transfer (PET) process. J Biol Inorg Chem 25, 151–159 (2020). https://doi.org/10.1007/s00775-019-01748-0
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DOI: https://doi.org/10.1007/s00775-019-01748-0