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Nano-biotinylated liposome-based immunoassay for the ultrasensitive detection of protein biomarker in urine

Liu, Peng, Fang, Xueen, Cao, Hongmei, Gu, Mingli, Kong, Jilie, Deng, Anmei
Talanta 2018 v.179 pp. 472-477
adenocarcinoma, biomarkers, cross reaction, diagnostic techniques, enzyme-linked immunosorbent assay, proteins, proteomics, urine
With the development of proteomics and the continuous discovery of biomarkers of trace proteins, it is important to accurately quantify low abundance protein, especially in urine for clinical diagnostics. In this paper, we reported a novel nano-biotinylated liposome-based immuno-loop-mediated isothermal amplification (LI-LAMP) for the ultrasensitive detection of REG1A (a biomarker for pancreatic ductal adenocarcinoma (PDAC) in urine) with high specificity. The detection range was 1µg/mL to 1fg/mL, with a detection limit of 1fg/mL, and no cross-reactivity was observed to occur in this assay. Compared with the amount of REG1A added, REG1A recovery using this method was 130% and 89%. Detection of REG1A concentrations using the LI-LAMP assay from real samples were in good agreement with those determined using ELISA, and relative deviations were not more than 10%. LI-LAMP shows good potential as a clinical diagnostic assay.