A Visual FRET Immunofluorescent Biosensor for Ratiometric Parathyroid Hormone (1-84) Antigen Point-of-Care Detection
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Excessive secretion of PTH leads to disturbance of calcium and phosphorus metabolism in the body, which promotes bone, kidney, digestive system and nervous system diseases. Due to the short half-life of PTH, it becomes a difficult issue for PTH detection in the clinical diagnosis field. We explored a competitive immunofluorescent sensing mode based on FRET of two-color CdTe QDs for ratiometric PTH 1-84 antigen detection. The FRET effect and ratiometric fluorescence between the two-color CdTe QDs motivated accurate quantification of PTH 1-84 antigen concentration from 0.01 ng mL to 0.08 ng mL with a limit of detection of 3 pg mL. More importantly, under UV irradiation, samples with different concentrations of PTH 1-84 antigen achieved fluorescence visualization, which provides huge possibility for the practical application of PTH 1-84 antigen point-of-care detection.