HP Data Explorer 4 Series Manual de usuario Pagina 326

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Chapter 7 Data Explorer Examples
7-10 Applied Biosystems
7
Figure 7-7 Subtracted Spectrum
The peak at 391 is still present, which indicates one of the
following conditions:
You did not subtract sufficient baseline
The peak is a coeluting component
To evaluate further, create an extracted ion chromatogram for
391 Da as described below and evaluate the signal.
Creating
extracted ion
chromatogram
To create the extracted ion chromatogram, right-click-drag
over the peak at 391 Da in the spectrum trace.
NOTE: You can also create an extracted ion chromatogram
by selecting Trace from the Display menu, selecting
Extracted Ion, then entering a mass.
Figure 7-8 illustrates the extracted ion chromatogram for mass
391. The signal is relatively consistent, indicating that it is
background instead of a component peak.
Figure 7-8 Extracted Ion Chromatogram for Mass 391 Da
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