Journal
ACS SENSORS
Volume 5, Issue 5, Pages 1336-1344Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.9b02515
Keywords
micromotors; on-the-move immunoassay; polymers; fluorescence microscopy; procalcitonin; diagnostics; neonate sepsis
Funding
- Spanish Ministry of Economy, Industry and Competitiveness [CTQ2017-86441-C2-1-R]
- TRANSNANOAVANSENS program from the Community of Madrid [S2018/NMT-4349]
- La Caixa Impulse program [CI017-00038]
- Spanish Ministry of Education Culture and Sports
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A new fluorescence micromotor-based immunoassay (FMIm) has been developed for procalcitonin (PCT) determination as an early sepsis diagnostic analytical tool. The micromotors combine the high binding capacity of the specific antibodies onto their polymeric polypyrrole outer layer (PPy layer), with their magnetic guidance (Ni layer) and self-propulsion by catalytic generation of oxygen bubbles (PtNP inner layer) to actively recognize the PCT antigen. This FMIm allowed a sensitive (LOD = 0.07 ng mL(-1)) and direct PCT determination in clinical samples from very low-birth-weight infants (VLBWI) with sepsis suspicion, using small volumes of sample (25 mu L) in a clinically relevant range of concentrations (0.5-150 ng mL(-1)). The good agreement between PCT levels obtained by our micromotor-based method and routine immunofluorescence hospital determination demonstrates the feasibility for the analysis in VLBWI samples and its potential as a point-of-care diagnostic tool for sepsis.
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