Chemical Research in Chinese Universities ›› 2024, Vol. 40 ›› Issue (2): 320-325.doi: 10.1007/s40242-024-4024-6

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Single Particle Colorimetric Acid Phosphatase Activity Assay with CeO2-modified Gold Nanoparticles

ZHU Tang Jiayao1, YUAN Xiang1, MAO Guojiang2, WEI Lin1, XIAO Lehui3   

  1. 1. Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, National and Local Joint Engineering Laboratory for New Petrochemical Materials and Fine Utilization of Resources, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, P. R. China;
    2. Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, P. R. China;
    3. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
  • Received:2024-01-29 Revised:2024-02-23 Online:2024-04-01 Published:2024-03-27
  • Contact: WEI Lin lwei@hunnu.edu.cn
  • Supported by:
    This work was supported by the Natural Science Foundation of Hunan Province, China (No. 2022JJ40266) and the Open Research Fund of School of Chemistry and Chemical Engineering, Henan Normal University, China (No. 2022A04).

Abstract: Acid phosphatase (ACP) is a ubiquitous phosphatase in living organisms. The abnormal variation of ACP is related to various diseases. Herein, we propose a colorimetric method based on CeO2-modified gold core shell nanoparticles (Au@CeO2 NPs) to analyze ACP activity with high sensitivity and specificity. In this design, 2-phospho-L-ascorbic acid trisodium salt (AAP) is dephosphorylated by ACP and produces reductive ascorbic acid (AA), which makes the CeO2 shell decomposition. A remarkable blue shift of localized surface plasmon resonance peak (LSPR, from yellow to green) along with the scattering intensity ratio changes from individual Au@CeO2 NPs are observed. ACP activity can be quantified by calculating the ratio changes of individual Au@CeO2 NPs. This assay reveals limit of detection (LOD) of 0.044 mU/mL and the linear range of 0.05—5.0 mU/mL, which are much lower than most of spectroscopic measurements in bulk solution. Furthermore, the recovery measurements in real samples are satisfactory and the capacity for practical application is demonstrated. As a consequence, Au@CeO2 NPs used in this assay will find new applications for the ultrasensitive detection of enzyme activity.

Key words: Single particle imaging, Dark field, Gold nanoparticle, Enzyme activity, Colorimetric detection