We demonstrate detection and quantification of bacterial load with a novel microfluidic one-pot wash-free fluorescence hybridization (FISH) assay in droplets. The method offers minimal manual workload by only requiring mixing of the sample with reagents and loading it into a microfluidic cartridge. By centrifugal microfluidic step emulsification, our method partitioned the sample into 210 pL (73 µm in diameter) droplets for bacterial encapsulation followed by permeabilization, hybridization, and signal detection. Employing locked nucleic acid (LNA)/DNA molecular beacons (LNA/DNA MBs) and NaCl-urea based hybridization buffer, the assay was characterized with , , and . The assay performed with single-cell sensitivity, a 4-log dynamic range from a lower limit of quantification (LLOQ) at ~3 × 10 bacteria/mL to an upper limit of quantification (ULOQ) at ~3 × 10 bacteria/mL, anda linearity R = 0.976. The total time-to-results for detection and quantification was around 1.5 hours.
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| http://dx.doi.org/10.3390/bios12040237 | DOI Listing |
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