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A colorimetric aptasensor for CA125 determination based on dual catalytic performance of CeO2 nanozyme confined in macroporous silica foam

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Abstract

A portable colorimetric aptasensor was constructed based on the dual catalytic performance of CeO2 nanozyme to determine carbohydrate antigen 125 (CA125). Firstly, CeO2 nanozyme was synthesized by calcination and ultrasonically dispersed in a macroporous silica foam (MSF) to form CeO2@MSF. Then the aptamer of CA125 (apt) and complementary DNA (c-DNA) were successively assembled on the CeO2@MSF to construct a CeO2@MSF/apt/c-DNA colorimetric aptasensor, which exhibited excellent oxidase-mimic performance and phosphatase-mimic activity simultaneously. In the presence of CA125, the apt specifically binds to target CA125, and the single-strand c-DNA leaves the CeO2@MSF/apt surface, which is catalytically hydrolyzed by exonuclease I. The produced phosphate ions inhibit the phosphatase-mimic activity of CeO2 nanozyme. Thus, the absorbance at 652 nm of 3,3′,5,5′-tetramethylbenzidine solution containing ascorbic acid-2-phosphate increases with the concentration of CA125. The response is linearly related to the logarithm of CA125 concentration from 1.0 to 10.0 U/mL under optimal experimental conditions. Based on this, the constructed colorimetric aptasensor has a high sensitivity, good selectivity, and high accuracy for CA125 determination in real human serum sample.

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Funding

The authors thank the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP), the Jiangsu Provincial Natural Science Foundation for Higher Education Institutions (19KJB150026), and the Postgraduate Research & Practice Innovation Program of Jiangsu Normal University (2021XKT0321, 2022XKT0305) for financial support.

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  1. School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116, China

    Ruiting Wen, Xingyang Wu, Jiuying Tian & Jusheng Lu

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  1. Ruiting Wen
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  2. Xingyang Wu
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Correspondence to Jiuying Tian or Jusheng Lu.

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Wen, R., Wu, X., Tian, J. et al. A colorimetric aptasensor for CA125 determination based on dual catalytic performance of CeO2 nanozyme confined in macroporous silica foam. Microchim Acta 190, 470 (2023). https://doi.org/10.1007/s00604-023-06046-w

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