In this study, a totally integrated in situ analyzer for microbial gene detection has been developed for oceanography applications. A PDMS–glass microfluidic device that is capable of cell lysis, DNA purification, PCR, and optical detection has been utilized as the core element of the in situ analyzer. Microbial genomic DNA is purified and concentrated on glass beads packed in the microfluidic device. PCR is performed in a flow-through manner, and the amplified products are fluorescently detected using optical fibers. The sensitivity of a completed analyzer with deep-sea operation capabilities has been evaluated in a laboratory setting, and the analyzer has been operated in real deep-sea environments. Field evaluations have shown that the amplification of the eubacterial universal 16S rRNA gene and the recovery of the PCR product to the surface are successfully achieved in deep-sea environments.
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