Studies On The Synthesis And Application Of A New Feeding Attractant DMPT Bromide

DMPT (Dimethyl-β-Propiothetin) is a kind of tertiarly sulfonium compounds. It widely exists in sea alga cells and is a metabolite from sulfur. DMPT can promote feeding motion and improve the growth of many species of sea fish and freshwater fish. Meanwhile, it can improve the physique and enhance the resistance of fish to the harmful circumstances.DMPT is synthesized by the reaction of dimethylsulfide to 3-bromopropionic acid at around 40℃ during the reflux period for 24 hours, and purified by washing it with cold dry ether and crystallizing it from its methanol solution. The purity of the DMPT crystal obtained is above 96%, and the production rate is about 73%.The head-space gas chromatogram method to determine the purity of DMPT crystal, as well as the content of DMPT in feed and fish muscles has been established in the paper. The stability of DMPT crystal, especially the stability of DMPT after put into the feed, is also reported in the paper. Furthermore, with carassius auratus as an example, the accumulation and elimination of DMPT in fish muscle was primarily testes.The emphasis of this study was put on the effects of DMPT on the ingestion and growth of juvenile fishes, for example carassius auratus, Labidochromis caeruleus, Sparus macrocephalus and Scophthalmus maximus. It's proved that 0.1g/kg DMPT bromide in formulated feed promotes feeding motion, while 0.2g/kg DMPT bromide in feed makes the body weight increase of the above fishes reach 1.3, 1.8, 1.6, 1.2-fold of the contrast groups, respectively. With 0.2g/kg DMPT bromide in feed, the body length increase of Sparus macrocephalus and Scophthalmus maximus reach 1.6 and 1. 1-fold of the contrast groups respectively. On the other hand, the feed conversion rate drops 14. 3%, 26.4% and 6.9% accordingly. The difference between the effects is due to the difference between the metabolism of fishes.