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Several process-specific centrifugal platforms currently exist on the market and perform various functions. It combines the advantages of portability, ease of automation, low cost, and facility of executing pre-processing of the samples with the capability of multiplexing multiple samples and/or multiple tests on the same disposable disc. ![]() The fluorescent signals for the standard and integrated designs were nearly identical (within the margin of error) for the first several minutes of reciprocation, but the fluorescent signal for the integrated design was significantly higher when the reciprocation time was increased to 7 min.Ĭentrifugal microfluidics in the last 20 years has developed to be one of the most promising platforms for inexpensive point-of-care (POC) diagnostics. The test analyte was Europium Streptavidin Polystyrene analyte (10 −3 mg/mL) and the microarray consisted of Biotin bovine serum albumin (BSA) dots. A fluorescent analyte testing on the bio-sensing array of the presented novel integrated design and on the standard reciprocation design CD was conducted for 7 min of reciprocation in each case. Experimentally, the isolation of red blood cells in the sedimentation chamber was confirmed using the ImageJ image processor to detect the visible color-based separation of the plasma from the blood. While no inflow of the red blood cells into the reciprocation chamber was observed, the conditions of 20 g jerk acceleration were also simulated in ANSYS finite element analysis software, and it was found that the CD design that was used is capable of retaining red blood cells in the sedimentation chamber. Due to the small cross-section of the connecting channel, there is no inflow of the red blood cell into the reciprocation chamber during subsequent fluidic operations of the CD. ![]() The integrated design allows plasma that is separated from the red blood cells in a sedimentation chamber to flow into the reciprocation chamber via a narrow connecting channel of 0.5 mm × 0.5 mm cross-section. Present work demonstrates, for the first time, simultaneous integration of blood plasma separation (BPS) and reciprocation on the CD platform. There are several techniques for using specific fluidic patterns in the centrifugal fluidic network, such as reciprocation, that enhances the sensitivity of the immunoassays, including those using microarray antigen membranes. ![]() In order to use whole blood as a sample on CDs, centrifugation is used to separate red blood cells from plasma on CDs. These CD devices can be used as portable point-of-care (POC) platforms with sample-to-answer capabilities where bodily fluids such as whole blood can be used as samples directly without pre-processing. Numerous immunoassays have been successfully integrated on disc-based centrifugal platforms (CDs) over the last 20 years.
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