Ultrasensitive ELISA for the detection of hCG based on assembled gold nanoparticles induced by functional polyamidoamine dendrimers

Amplifying the signal of ELISA is important in the early disease diagnosis. Herein we report an ultrasensitive ELISA applying for the detection of hCG based on the assemble of AuNPs induced by functional PAMAM . The AuNP-PAMAM probe shows a competitive advantage sensitivity of 0.03 IU L −1 compared to traditional ELISA and mAb 1 -AuNP-HRP probe. The line range is ranged from 0.1 to 6.4 IU L −1 . Moreover, the precision and reproducibility and specificity of AuNP-PAMAM probe are also eligible for the detection of hCG. The assembled AuNPs was firstly used in the signal enhancement in immunoassay .