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Oligonucleotide Purity Analysis by Capillary Electrophoresis

ts necessary to perform oligonucleotide separations using the BioFocus capillary electrophoresis system:
Two fused silica capillaries, coated internally with poly(AAEE), 30 cm 75 m I.D. 375 m O.D., with detection window 8 cm from the end
CE Oligonucleotide Run Buffer, 50 ml
CE Oligonucleotide Size Standards 8-32mer, 13 peaks, total 0.5 OD units (see Figure 1).


Performance

Purity Results Fast

The BioFocus system provides automated analysis of up to 28 samples in one carousel setup. As Figure 2 illustrates, separations can be achieved in 10 or 12 minutes. The BioFocus Integration Software can be programmed to automatically integrate the results and print a quantitative report.

Accurate Size Estimation
The size standard can be used as an external standard to estimate the size of the sample oligonucleotide. Figure 3 shows an overlay of an 8mer synthysis product and the CE Oligonucleotide Size Standard.

High Resolution
Figure 2 shows an electropherogram of the CE Oligonucleotide Size Standard. Figure 4 shows that typical peak efficiency for the 32mer component is above 200,000 theoretical plates. Single base resolution is usually achievable out to 40mer. Resolution decreases with increasing size of the oligonucleotide.

Reproducibility
Table 1 shows the excellent reproducibility of the technique. Over a series of 12 successive runs, the average %RSD for area is 1.54% and 0.82% for migration time.


Key Benefits

Fast Results for a given sample are available in 12 minutes or less.
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