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

calculated Rs values were plotted as a function of the expected MW of each protein in the ladder (Figure 3). With the Pro260 assay, Rs increased with increasing protein size, from 1.2 for a 10 and 11 kD protein pair to 2.0 for a pair of proteins of 260 and 286 kD. The Experion data reveal the point at which two proteins differing in MW by 10%, and with peak shapes similar to those of the Pro260 ladder proteins, can be completely resolved by the system (Rs > 1.5). These criteria are met with proteins larger than 25 kD. The Rs values associated with the protein 200 plus separations also increased with increasing MW, but to a lesser extent (Rs < 1.7) and with resolution at the baseline occurring for proteins larger than about 55 kD (Figure 3). The data again show that the Pro260 analysis kit achieves improved resolution of proteins compared to the protein 200 plus assay across a broad range of MW.

Linear Dynamic Range
Of interest to users of any protein quantitation assay is its linear dynamic range, or the concentration range over which the relative detection signal and concentration remain directly proportional to each other. A wide linear dynamic range permits the analysis of a wide range of sample concentrations.

This parameter was examined using the Experion Pro260 analysis kit and the protein 200 plus LabChip kit by loading a chip with increasing concentrations of CA covering nearly three orders of magnitude (2.52,000 ng/l). Using the calibration curve function in each software package, a linear fit of the data was created and a coefficient of determination, r2, was calculated. On average, the 10-point concentration series
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