Citation: Ying CHENG, Yi-Bing LIU, Hui-Yao ZHAO, Xin-Da NAN, Xiao-Qing FAN, Sheng-Ling LI, Li-Feng DING, Qi WANG, Yu-Lan NIU. Construction of MnO2 nanoparticles mediated UV-visible absorption-fluorescence dual channel sensor and detection of D-penicillamine[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(4): 617-626. doi: 10.11862/CJIC.2023.032 shu

Construction of MnO2 nanoparticles mediated UV-visible absorption-fluorescence dual channel sensor and detection of D-penicillamine

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  • In this work, manganese dioxide nanoparticles (MnO2 NPs) were synthesized through a in situ redox reaction using polyethyleneimine (PEI) as both template and reductant. The morphology, composition, UV-visible absorption, and catalytic oxidation performance of MnO2 NPs were characterized. MnO2 NPs possessed the characteristic of catalytic oxidation of o-phenylenediamine (OPD) to 2, 3-diaminophenazine (DAP), producing the UV-visible absorption at 420 nm and fluorescence emission at 560 nm. Owing to its active sulfhydryl, D-penicillamine (DPA) could decompose MnO2 NPs through a unique redox reaction. Therefore, the catalytic oxidation activity was inhibited that made UV-visible absorption-fluorescence signals decreased and even disappeared. Based on the relationship between spectral variation and DPA concentration, a MnO2 NPs mediated UV-visible absorption-fluorescence dual channel sensing method for DPA was established. Fluorescence channel sensing possessed satisfactory linear range and sensitivity. The linear range was 1-80 μmol·L-1 with a detection limit of 0.54 μmol·L-1. Moreover, MnO2 NPs mediated fluorescence sensing was applied in human urine sample detection and the recovery was in a range of 98.31%-107.76%, which proved the reliability of this method.
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