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• W2048445093 abstract "DNA sequencing in a lab-on-a-chip aims at providing cheap, high-speed analysis of low reagent volumes to, e.g., identify genomic deletions or insertions associated with genetic illnesses. Detecting single base-pair insertions/deletions from DNA fragments in the diagnostically relevant range of 150−1000 base-pairs requires a sizing accuracy of <i>S</i> < 10^-3. Here we demonstrate <i>S</i> = 4×10^-4. A microfluidic chip was post-processed by femtosecond-laser writing of an optical waveguide. 12 blue-labeled and 23 red-labeled DNA fragments were separated in size by capillary electrophoresis, each set excited by either of two lasers power-modulated at different frequencies, their fluorescence detected by a photomultiplier, and blue/red signals distinguished by Fourier analysis. Different calibration strategies were tested: a) use either set of DNA molecules as reference to calibrate the set-up and identify the base-pair sizes of the other set in the same flow experiment, thereby eliminating variations in temperature, wall-coating and sieving-gel conditions, and actuation voltages; b) use the same molecular set as reference and sample with the same fluorescence label, flown in consecutive experiments; c) perform cross-experiments based on different molecular sets with different labels, flown in consecutive experiments. From the results we conclude: Applying quadratic instead of linear fit functions improves the calibration accuracy. Blue-labeled molecules are separated with higher accuracy. The influence of dye label is higher than fluctuations between two experiments. Choosing a single, suitable dye label combined with reference calibration and sample investigation in consecutive experiments results in <i>S</i> = 4×10^-4, enabling detection of single base-pair insertion/deletion in a lab-on-a-chip." @default.
• W2048445093 created "2016-06-24" @default.
• W2048445093 creator A5000823735 @default.
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• W2048445093 date "2015-03-05" @default.
• W2048445093 modified "2023-10-03" @default.
• W2048445093 title "DNA separation and fluorescent detection in an optofluidic chip with sub-base-pair resolution" @default.
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• W2048445093 doi "https://doi.org/10.1117/12.2077515" @default.
• W2048445093 hasPublicationYear "2015" @default.
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