A sandwich-type electrochemical immunosensor for sensitive detection of HER2 based on dual signal amplification of La-MOF-PbO2 and PEI-MoS2NFs composites

• Published in: Bioelectrochemistry (Amsterdam, Netherlands) Netherlands), 2023-08, Vol.152, p.108431-108431, Article 108431
• Main Authors: Xia, Qin, Mu, Zhaode, Qing, Min, Zhou, Jing, Bai, Lijuan
• Format: Article
• Language: English
• Subjects: Breast cancer; Human epidermal growth factor receptor 2; Immunosensor; La-MOF-PbO2; MoS2 nanoflowers
• ISSN: 1567-5394; 1878-562X
• DOI: 10.1016/j.bioelechem.2023.108431

•Toluidine blue decorated La-MOF-PbO2 composite is designed as new signal indicator.•PEI functionalized MoS2 nanoflowers as sensing platform exhibits good conductivity.•La-MOF-PbO2 increases the amount of toluidine blue to enhance electrochemical signal.•The designed immunosensor shows high sensitivity and specificity for HER2 detection. In recent decades, the incidence of breast cancer has increased year by year, posing a serious threat to human health and quality of life, and about 30% of breast cancer patients have human epidermal growth factor receptor 2 (HER2) overexpression. Therefore, HER2 has become an important biomarker and indicator for the clinical evaluation of breast cancer in diagnosis, prognosis and recurrence. In this work, polyethyleneimine functionalized MoS2 nanoflowers (PEI-MoS2NFs) with good electrical conductivity and abundant active binding sites were designed and employed as a sensing platform for immobilizing the primary antibody of HER2 (Ab1). In addition, a La-MOF-PbO2 composite with a large specific surface area and good conductivity was used to load lots of electroactive toluidine blue (TB) and the secondary antibody of HER2 (Ab2) via gold nanoparticles (AuNPs) as the linker. Thus, the constructed sandwich-type electrochemical immunosensor was applied for sensitive detection of HER2, which showed a wide linear range from 100 fg mL−1 to 10 μg mL−1 with a lower limit of detection of 15.64 fg mL−1. Therefore, the resulting immunosensor in this study would have a potential application in clinical bioanalysis.