Single-pulse chromatogram

Correlation of the code with itself (autocorrelation) yields only one correlation point in the time domain defined by the sequence and the unit code interval (see Figure 5c) and an otherwise clean baseline. Since the detector in our chromatogram just follows what the sample valve is doing, it also should be a pseudo random sequence and the cross-correlation of input and output is really an autocorrelation and thus yields the single pulse correlogram with an otherwise clean baseline. 

Fig. 14.13. Chromatograms showing single and comprehensive two-dimensional GC of drugs extracted from urine. (A) GC-FID chromatogram, (B) Pulsed GcxGC chromatogram (C) GCxGC contour plot. Adapted with permission from Ref. [15, Fig. 14.3]. Complete details on separation conditions and analyte identity can be found in the original paper.

Figure 1 Expanded chromatograms from Dionex ion chromatograph of enzyme hydrolysates of corn and potato starch, the use of a single enzyme, amyloglucosidase (AMG), and a mixture of AMG, a-amylase (a-A), and pullulanase (PU), to show the effect on hydrolysis of limit dextrin. Anion exchange column AS6, with pulsed amperometric detection. Gradient flow solvents (1) ISOmmolT NaOH and (2) ISOmmoll NaOH + 500mmol I NaOOCCHs. Postcolumn addition of 0.3mmoll NaOH.

Figure 5.24 shows the high-speed separation of a 20-component pesticide mixture (plus one impurity peak). The 14-m-long, 0.18-imn-i.d. thin film column ensemble consists of 7.0 m of a trifluoropropylmethyl polysiloxane column followed 7.0 m of 5% phenyl dimethyl polysiloxane column segment. For chromatogram (a), no stop-flow pulses were used, and component pairs 2,3 and 10,11 coelute. For chromatogram (b), a single 2-s wide stop-flow pulse was used to enhance the resolution of peak pair 2,3. Note that the peak pattern and resolution... 

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