Abstract
The contents of 2-heptanone and 10-hydroxy-trans-dec-2-enoic acid present in the mandibular glands of worker bees of various ages were determined by gas chromatography. The content of 2-heptanone was dependent on the physiological development rather than the chronological age of the bee. It remained at zero for hive bees and reached a maximum of ca. 40 40 μg/bee after the bees began to forage. The content of 10-hydroxy-trans-dec-2-enoic acid found in worker bee heads increased with age and/or in connection with normal changes in the type of social activity of the bee. Only trace amounts of this acid were found in newly emerged bees, but up to 60 μg/bee were found after about 3 weeks of age.
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