High-sensitivity detection of cardiac troponin I with UV LED excitation for use in point-of-care immunoassay

Olga Rodenko, Susann Eriksson, Peter Tidemand-Lichtenberg, Carl Peder Troldborg, Henrik Fodgaard, Sylvana van Os, Christian Pedersen

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Abstract

High-sensitivity cardiac troponin assay development enables determination of biological variation in healthy populations, more accurate interpretation of clinical results and points towards earlier diagnosis and rule-out of acute myocardial infarction. In this paper, we report on preliminary tests of an immunoassay analyzer employing an optimized LED excitation to measure on a standard troponin I and a novel research high-sensitivity troponin I assay. The limit of detection is improved by factor of 5 for standard troponin I and by factor of 3 for a research high-sensitivity troponin I assay, compared to the flash lamp excitation. The obtained limit of detection was 0.22 ng/L measured on plasma with the research highsensitivity troponin I assay and 1.9 ng/L measured on tris-saline-azide buffer containing
bovine serum albumin with the standard troponin I assay. We discuss the optimization of time-resolved detection of lanthanide fluorescence based on the time constants of the system and analyze the background and noise sources in a heterogeneous fluoroimmunoassay. We determine the limiting factors and their impact on the measurement performance. The suggested model can be generally applied to fluoroimmunoassays employing the dry-cup concept.
Original languageEnglish
JournalBiomedical Optics Express
Volume8
Issue number8
Pages (from-to)3749-3762
ISSN2156-7085
DOIs
Publication statusPublished - 2017

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