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- W2999051614 abstract "We present on-chip implementation of an isothermal nucleic acid amplification assay with optomagnetic detection. Isothermal rolling circle amplification (RCA) was designed for the highly specific detection of a single point mutation in the subsequence of the <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>katG</i> catalase peroxidase gene responsible for resistance against the antibiotic isoniazid in <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>Mycobacterium tuberculosis</i> . The assay was integrated using streptavidin-coated magnetic microbeads (MMBs) as a movable substrate to transport the synthetic <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>katG</i> target and products between the sequential processing steps. RCA products were detected via optomagnetic measurements of the binding of functionalized magnetic nanoparticles (MNPs). Binding of MNPs to RCA products leads to an increase of their hydrodynamic size and consequently a shift of the optomagnetic signal to lower frequencies. We first analyzed the affinity of DNA probes used for target capture on MMBs and binding of MNPs to RCA products, respectively. This enabled us to choose conditions where amplification products were released from the MMBs and where their binding to MNPs was optimal. The optimized assay was transferred to a polymer chip with three connected chambers filled with reaction buffers for capture, RCA, and detection. The chip was operated in a setup integrating temperature control, transport of the DNA on magnetic carriers, and dose-dependent detection of MNP clustering. For a total assay time of about 2 h, we demonstrate specific detection of the antibiotic resistance in a synthetic tuberculosis DNA target with a detection limit of 4 pM." @default.
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- W2999051614 date "2020-01-01" @default.
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- W2999051614 title "On-Chip DNA Analysis of Tuberculosis Based on Magnetic Nanoparticle Clustering Induced by Rolling Circle Amplification Products" @default.
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- W2999051614 doi "https://doi.org/10.1109/lmag.2019.2959545" @default.
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