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A single-molecule counting approach for quantifying the antibody affixed to a surface using quantum dots and epi-fluorescence microscopy is presented. Modifying the glass substrates with carboxyl groups provides a hydrophilic surface that reacts with amine groups of an antibody to allow covalent immobilization of the antibody. Nonspecific adsorption of single molecules on the modified surfaces was...
We presented a sensitive method to quantify antibody based on single-molecule counting by total internal reflection fluorescence microscopy with quantum dot labeling. In this method, the biotinylated monoclonal anti-human IgG molecules were immobilized on the silanized glass substrate surface. By the strong biotin–streptavidin affinity, streptavidin-coated quantum dots were labeled to the target molecules...
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