A convenient smartphone-assisted colorimetric for 6-Mercaptopurine detection using enhanced oxidase-like activity of β-cyclodextrin modified MnO2 nanosheets

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 318; p. 124493
• Main Authors: Huang, Ruiqi, Qin, Yingfeng, Huang, Yanqin, Huang, Zengqiong, Ye, Gao-Jie
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.10.2024
• Subjects: 6-Mercaptopurine; Colorimetric; Oxidase-like activity; Smartphone; β-CD@MnO2 NNS; 6-Mercaptopurine; β-CD@MnO2 NNS; Smartphone; Oxidase-like activity; Colorimetric
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2024.124493

[Display omitted] •A robust nanozyme β-CD@MnO2 NNS was designed via simple modification.•β-CD@MnO2 NNS possesses excellently enhanced catalytic activity.•Visual and portable smartphone-integrated sensing of 6-mercaptopurine was realized.•The proposed method has a wide linear range and a low LOD.•This method displays a good assay performance in real samples. 6-mercaptopurine (6-MP) is widely used in the treatment of many diseases, but exhibits some serious side effects due to its toxicity. Therefore, it is important and imperative to effectively control and monitoring concentration of 6-MP. Herein, we designed a smartphone-assisted colorimetric sensing platform for 6-MP detection, based on an excellent β-cyclodextrin modified MnO2 nanosheets (β-CD@MnO2 NNS) mediated oxidase-like activity. β-CD@MnO2 NNS can directly oxidizes 3,3′,5,5′-tetramethylbenzidine (TMB) into oxidized TMB with color changes, yielding more than 3-fold higher oxidase-like catalytic activity compared with individual MnO2 NNS. After adding 6-MP, β-CD@MnO2 NNS can be reduced to Mn2+ and lose their oxidase-like properties, resulting in a color and absorbance change for sensitive and selectivity detection of 6-MP. Meanwhile, the smartphone-based color recognition application can intuitively and simply measure the concentration of 6-MP. The limits of detection UV–vis instrument and smartphone were 0.35 μM and 0.86 μM, respectively. This method has also been successfully applied to the detection of real samples. Finally, this study provides a new promising platform for detection of 6-MP and is expected to be used in application of pharmaceutical analysis and biomedicine.