Enhanced colorimetric immunoassay accompanying with enzyme cascade amplification strategy for ultrasensitive detection of low-abundance protein.
Enhanced colorimetric immunoassay accompanying with enzyme cascade amplification strategy for ultrasensitive detection of low-abundance protein.
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增强的比色免疫测定结合酶级联放大策略,用于低丰度蛋白质的超灵敏检测。
DOI:
10.1038/srep03966
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发表时间:
2014-02-10
影响因子:
4.6
通讯作者:
Tang D
中科院分区:
文献类型:
--
作者:
Gao Z;Hou L;Xu M;Tang D
Methods based on enzyme labels have been developed for colorimetric immunoassays, but most involve poor sensitivity and are unsuitable for routine use. Herein, we design an enhanced colorimetric immunoassay for prostate-specific antigen (PSA) coupling with an enzyme-cascade-amplification strategy (ECAS-CIA). In the presence of target PSA, the labeled alkaline phosphatase on secondary antibody catalyzes the formation of palladium nanostructures, which catalyze 3,3′,5,5′-tetramethylbenzidine-H2O2 system to produce the colored products, thus resulting in the signal cascade amplification. Results indicated that the ECAS-CIA presents good responses toward PSA, and allows detection of PSA at a concentration as low as 0.05 ng mL−1. Intra- and inter-assay coefficients of variation are below 9.5% and 10.7%, respectively. Additionally, the methodology is validated for analysis of clinical serum specimens with consistent results obtained by PSA ELISA kit. Importantly, the ECAS-CIA opens a new horizon for protein diagnostics and biosecurity.
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影响因子:
7.4
作者:
Ambrosi, Adriano;Airo, Federico;Merkoci, Arben
通讯作者:
Merkoci, Arben
影响因子:
2.2
作者:
Frey, A;Meckelein, B;Schmidt, MA
通讯作者:
Schmidt, MA
影响因子:
16.6
作者:
Krishnan, Sadagopan;Mani, Vigneshwaran;Wasalathanthri, Dhanuka;Kumar, Challa V.;Rusling, James F.
通讯作者:
Rusling, James F.
影响因子:
6.2
作者:
Gao, Zhuangqiang;Xu, Mingdi;Tang, Dianping
通讯作者:
Tang, Dianping
影响因子:
7.4
作者:
Gao, Zhuangqiang;Xu, Mingdi;Tang, Dianping
通讯作者:
Tang, Dianping