辣根过氧化物酶
检出限
免疫分析
化学
酶
Atom(片上系统)
色谱法
生物化学
生物
计算机科学
嵌入式系统
抗体
免疫学
作者
Zhaoyuan Lyu,Shichao Ding,Nan Zhang,Yang Zhou,Nan Cheng,Maoyu Wang,Mingjie Xu,Zhenxing Feng,Xiangheng Niu,Yuan Cheng,Chao Zhang,Dan Du
出处
期刊:Research
[AAAS00]
日期:2020-01-01
卷期号:2020
被引量:48
标识
DOI:10.34133/2020/4724505
摘要
Single-atom nanozymes (SANs) possess unique features of maximum atomic utilization and present highly assembled enzyme-like structure and remarkable enzyme-like activity. By introducing SANs into immunoassay, limitations of ELISA such as low stability of horseradish peroxidase (HRP) can be well addressed, thereby improving the performance of the immunoassays. In this work, we have developed novel Fe-N-C single-atom nanozymes (Fe-Nx SANs) derived from Fe-doped polypyrrole (PPy) nanotube and substituted the enzymes in ELISA kit for enhancing the detection sensitivity of amyloid beta 1-40. Results indicate that the Fe-Nx SANs contain high density of single-atom active sites and comparable enzyme-like properties as HRP, owing to the maximized utilization of Fe atoms and their abundant active sites, which could mimic natural metalloproteases structures. Further designed SAN-linked immunosorbent assay (SAN-LISA) demonstrates the ultralow limit of detection (LOD) of 0.88 pg/mL, much more sensitive than that of commercial ELISA (9.98 pg/mL). The results confirm that the Fe-Nx SANs can serve as a satisfactory replacement of enzyme labels, which show great potential as an ultrasensitive colorimetric immunoassay.
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