1 Ocak 2017 Dergi makalesi Açık Erişim

Aygun, Ugur; Avci, Oguzhan; Seymour, Elif; Urey, Hakan; Unlu, M. Selim; Ozkumur, Ayca Yalcin

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    <subfield code="a">Label-Free and High-Throughput Detection of Biomolecular Interactions Using a Flatbed Scanner Biosensor</subfield>
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    <subfield code="a">Fluorescence based microarray detection systems provide sensitive measurements; however, variation of probe immobilization and poor repeatability negatively affect the final readout, and thus quantification capability of these systems. Here, we demonstrate a label-free and high-throughput optical biosensor that can be utilized for calibration of fluorescence microarrays. The sensor employs a commercial flatbed scanner, and we demonstrate transformation of this low cost (similar to 100 USD) system into an Interferometric Reflectance Imaging Sensor through hardware and software modifications. Using this sensor, we report detection of DNA hybridization and DNA directed antibody immobilization on label-free microarrays with a noise floor of similar to 30 pg/mm(2), and a scan speed of 5 s (50 s for 10 frames averaged) for a 2 mm X 2 mm area. This novel system may be used as a standalone label-free sensor especially in low-resource settings, as well as for quality control and calibration of microarrays in existing fluorescence-based DNA and protein detection platforms.</subfield>
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