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(a) Typical breakthrough curves seen during the frontal analysis studies that were performed for this report and (b) typical results obtained during the zonal elution studies examining the competition of a probe candidate with L-tryptophan. The concentrations that are shown by these curves represent (a) the applied concentration of 3-acetylindole or (b) the concentrations of L-tryptophan in the mobile phase. All other conditions are given in the text.
