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  • Title: On-chip detection of myoglobin based on fluorescence.
    Author: Darain F, Yager P, Gan KL, Tjin SC.
    Journal: Biosens Bioelectron; 2009 Feb 15; 24(6):1744-50. PubMed ID: 18945609.
    Abstract:
    A disposable immunosensor cartridge was developed that allows antibodies to be immobilized on the surface for the detection of myoglobin, a marker for the early assessment of acute myocardial infarction (AMI) using fluorescence techniques. The anti-myoglobin antibody was immobilized on a polystyrene substrate based on covalent bonding via silanization. The immunosensor chip layers were fabricated from sheets by CO(2)-laser ablation. The functionalized polystyrene surfaces were characterized by contact angle measurement, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). After the antigen-antibody reaction as a sandwich enzyme-linked immunosorbent assay (ELISA) with a horseradish peroxidase-conjugated secondary antibody (HRP-anti-myoglobin), addition of fluorogenic substrate produced a fluorescent dye which was quantified on-chip using fluorescent technique. The immunosensor response was linear for myoglobin concentrations between 20 and 230 ng/ml (r=0.991, n=3). The detection limit was found to be 16 ng/ml, which is lower than the clinical cut-off value for myoglobin in healthy patients. This protocol could be extended to the detection of other important cardiac markers simultaneously in microchannels.
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