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MAR and MAR Advantages Compared to other particle-based assays, the use of super paramagnetic particles as reporter elements offers unique characteristics. Advantages of MAR using magnetic particles as reporters in assays:
The total amount of analyte is measured in one volumetric measurement. Therefore, the entire analyte contained within the detector’s active region will be measured, thereby contributing to sensitivity. This contrasts with the optical-sensing techniques in which only reporter-analyte interactions on a surface are detectable. Side-by-side comparisons to visual lateral flow assays demonstrate a 10-1000 times increase in sensitivity.
The MAR platform provides quantitative results by employing super paramagnetic particles as reporter elements. The amount of magnetization as determined by the MAR can be directly correlated to the amount of analyte in the sample.
The strength of magnetic signal increases directly with the mass of the magnetic label. MAR measurements have been demonstrated to be linear over a range of at least 4 orders of magnitude. This inherent linearity contributes to sensitivity, accuracy, and wide dynamic range.
Measurement of each analytical region is performed in 9-15 seconds.
Super paramagnetic particles are magnetic only when in a magnetic field. This allows them to be freely manipulated in solution without aggregating. Super paramagnetic particles are stable, yielding reproducible measurement after an extended period of time. This property makes them ideal for archiving.
Super paramagnetic particles are easily substituted for colloidal gold or latex particles. They can be adapted to a wide range of lateral flow assays. Other assay components such as membranes, sample and wicking pads, as well as production equipments, may remain relatively unchanged.
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