Abstract
By the combined use of high-pressure liquid chromatography, Galleria bioassay and gas chromatography/ chemical ionization/mass spectrometry we were able to isolate and identify the three known natural juvenile hormones (JHs) from haemolymph extracts of larval and adult females of the cockroach Nauphoeta cinerea . This is the first demonstration of the simultaneous occurrence of the three JHs in the same insect and the first time JH I and II have been identified in a hemimetabolous insect. Quantitative investigations show that the composition of the three JHs is different at different developmental stages. The haemolymph of larvae contains a high percentage of JH I and II, whereas the haemolymph of adult females in the oocyte maturation stage contains mostly JH III. This suggests more juvenilizing functions for JH I and II and more gonadotropic functions for JH III.
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