Satiety Substance Supposed in the Hemolymph of the Prawn Penaeus japonicus

概要

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To investigate a satiety substance in the hemolymph of the prawn P.japonicus, chemicalanalysis of saccharide group under different molting stages and feeding conditions was doneusing paper and thin-layer chromatographies. Hemolymph patterns of saccharides, regardlessof the individual prawn's condition, showed a prominent glucose, and an especially weakreaction which corresponded to maltotriose.The oligosaccharide was identified as maltotriose by the thin-layer chromatography ofhemolymphs collected from four prawns. These prawns were injected with glucose solutionthrough the oesophagus into the stomach cavity and kept alive for 4.5h.In contrast to glucose, maltotriose showed an inhibitory effect on feeding during the postmoltperiod after its abdominal injection.Further, maltotriose indicated an accelerative effect on the nerve cells in the ventro-anteriorportion of the suboesophageal ganglion, because of the increase in their nucleo-cytoplasm ratioafter its abdominal injection.As a result, the oligosaccharide maltotriose seemed to perform as a satiety substance whichoriginated in the midgut gland of the prawn.
鹿児島大学の論文
1986-12-25