Abstract
Etaq-PCR, a portable real-time polymerase chain reaction platform, has been developed based on an electroactive hydrolysis probe design and immobilization-free electrochemical readout. The Etaq-PCR platform integrates cost effective commercial instruments and thermally stable cycling into a minimal device enabling real-time monitoring of PCR amplification. No complex electrode surface treatment or micro-fabrication is involved in the construction of the Etaq-PCR platform. Thus, one can easily construct a portable PCR platform via our design. Etaq-PCR achieved sufficient sensitivity, selectivity, and rapidness to meet the WHO ASSURED criteria (affordable, sensitive, specific, user-friendly, rapid, and robust, equipment-free, and deliverable) for point-of-care diagnosis systems. It showed good tolerance to clinical sample matrix as it displayed 100% accuracy in a validation experiment testing a drug resistance gene of nontyphoidalSalmonella in 25 raw clinical isolated samples in comparison with the gold standard qPCR. All in all, Etaq-PCR is a portable, deployable, and cost-effective PCR platform suitable for clinical applications.
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