Figure 11

Chromatograms showing an example of high performance liquid chromatography with electrochemical detection for the CNS and the albumen gland of randomly mating H. duryi (DA – dopamine, 5-HT – serotonin, NE – norepinephrine, LD – L-Dopa). NE eluted prior LD. a: elution profile of the CNS. Note the NE peak is higher than the LD peak, and the DA and 5-HT peaks show very clearly; b: elution profile of the albumen gland. Note NE and LD peaks are barely visible, 5-HT peak is absent, DA peak is very clear. A distinct peak that elutes prior to serotonin was not identified. Scale bar = 4.8 minutes.