Rapid Characterization of Biomolecules’ Thermal Stability in Segmented Flow-Through Optofluidic Microsystem
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Date
2020-03-30
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Referee
Mark
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Springer Nature
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Abstract
Optofluidic devices combining optics and microfluidics have recently attracted attention for biomolecular analysis due to their high detection sensitivity. Here, we show a silicon chip with tubular microchannels buried inside the substrate featuring temperature gradient (T) along the microchannel. We set up an optical fluorescence system consisting of a power-modulated laser light source of 470 nm coupled to the microchannel serving as a light guide via optical fiber. Fluorescence was detected on the other side of the microchannel using a photomultiplier tube connected to an optical fiber via a fluorescein isothiocyanate filter. The PMT output was connected to a lock-in amplifier for signal processing. We performed a melting curve analysis of a short dsDNA – SYBR Green I complex with a known melting temperature (TM) in a flow-through configuration without gradient to verify the functionality of proposed detection system. We then used the segmented flow configuration and measured the fluorescence amplitude of a droplet exposed to T of 2.31°C mm-1, determining the heat transfer time as 563 ms. The proposed platform can be used as a fast and cost-effective system for performing either MCA of dsDNAs or for measuring protein unfolding for drug-screening applications.
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Citation
Scientific Reports. 2020, vol. 10, issue 1, p. 1-9.
https://www.nature.com/articles/s41598-020-63620-5
https://www.nature.com/articles/s41598-020-63620-5
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Peer-reviewed
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en