The Intrinsic Content, Safety Level And Formation Of Formaldehyde In Aquatic Products

As a noxious chemical, formaldehyde ( FA ) easily has reaction with cell nucleophilic matter to damage DNA. Therefore, IARC has classified it as one of suspicious carcinogens.Because there is still no report about the intrinsic content and formation of formaldehyde in aquatic products especially in edible fish at home, it is significant to surveille the formaldehyde in edible fish and ascertain the safety level for market inspector to ensure people's diet safety.There were 56 kinds of marine fish contained 95 samples and 16 kinds of freshwater fish contained 19 samples being detected. The formaldehyde was detected in 20% live freshwater fish, 28.6% live marine fish, 22.2% frozen freshwater fish, and 70.2% frozen marine fish in our examination. In order to clarify the formation of formaldehyde, we studyed the characterization of trimethylamine-N-oxide demethylase (TMAOase) which has close correlation with formaldehyde. The result shows TMAOase activity is higher in bumbalo flesh and viscera, and lower in blue white flesh and viscera.The formaldehyde content is relatively high in dry aquatic products and its detection rate is 100%. The content in squid thread is very high and the maximal can reach 145.67mg/kg. At the same time,we found the formaldehyde content in water soaked products is also very high.The formaldehyde content is closely related with trimethylamine-N-oxide (TMAO) through studying the change of squid thread in the course of storing. An soaked experiment to discuss the residual and changed regulation of formaldehyde in aquatic product was perform in laboratory, the formaldehyde content of dry squid dunked in water and alkali without formaldehyde was decreasing along with time went by,while increasing in using formaldehyde and finally get to higher formaldehyde content in dry squid accompanied with irritant smell. Therefore the market management of aquatic...