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Real-time determination of virus titers using cell electric impedance technology

Apr 12, 2017

Vero cells in suspension were incubated with serial dilutions of a known concentration of West Nile virus (WNV) for 30 minutes at 37°C, followed by immediate addition of the cell/virus suspension to wells of ACEA’s electronic microtiter plates (E-Plates).  In contrast to uninfected control cells which grew to confluency and maintained a plateaued Cell Index (CI), virus-infected cells displayed a time-dependent decrease of CI down to zero, indicating complete cell lysis. Importantly, the time at which this cytopathic effect occurred correlated extremely well with the known titer of the virus. This is highlighted by plotting the CIT50 (time required for the CI to decrease by 50%) as a function of virus titer. Using this type of standard curve, it is possible to determine the viral titer in samples of unknown concentration.

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Agilent technologies

ACEA manufactures xCELLigence impedance-based, label-free, real time cell analysis system and NovoCyte flow cytometers.

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The RTCA DP Analyzer has three integrated stations for E-Plates 16 or CIM-Plates 16

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Located inside a tissue culture incubator, it is capable of switching any one of the wells on the E-Plate 96 to the RTCA Analyzer for impedance measurement

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Located inside a tissue culture incubator, it is capable of switching any one of the wells on any of six E-Plates to the RTCA Analyzer for impedance measurement

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Instrument can be integrated with automated liquid handling platforms or a robotic plate handler from different vendors

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