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Performance Comparison of the Experion Automated Electrophoresis System and a Competing Automated System for Protein Analysis, Rev A

f an experiment. In these and other cases where sizing is critical, it is important to obtain reliable sizing data over a broad MW range.

The Pro260 and protein 200 plus assays were examined for their ability to size the proteins in both the Pro260 and protein 200 plus ladders. In these experiments, each chip-based assay used its respective ladder as the standard by which sizing estimates were made. Results were analyzed with regard to sizing accuracy, which was measured as the percent difference from the expected MW, and sizing reproducibility, which was evaluated using the coefficient of variation, or CV ([standard deviation/mean] x 100), as a statistical measure. The results of these experiments are summarized in Table 1.

The published separation ranges of the Pro260 and protein 200 plus assays are 10260 kD and 14.4210 kD,
respectively, and, as could be expected, each system produced the most accurate sizing for its own ladder proteins (Table 1). When the Pro260 ladder was used as sample, the Pro260 assay produced size estimates that deviated from expected values by less than 1%, as compared to deviations as high as 5% produced by the protein 200 plus assay. In addition, the protein 200 plus assay was unable to resolve the 10 kD and 260 kD proteins of the Pro260 ladder, as both were outside of its analysis range. In contrast, when the protein 200 plus ladder was used as sample, the Pro260 assay produced less accurate size estimates (deviations as high as 8%) than the protein 200 plus assay (deviations ≤3%). The data in Table 1 also show that the Pro260 analysis kit consistently produced highly reproducible results (CV ≤1.1%) regardless of the ladder used, while th
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