Squid And Their Products Of Formaldehyde Background Investigation And Evaluation

As a noxious chemical,formaldehyde(FA) is easily to react with cell nucleophilic matter to damage DNA.Therefore,IARC has classified it as one of suspicious carcinogens.However,formaldehyde is a normal product of cell metabolism,widely exists in natural foods.The trace of formaldehyde may appear in meat,poultry,fish and fruit.Because there are fewer reports about the intrinsic content and formation of formaldehyde in aquatic products,especially in edible fish inland,it is significant to delve the formaldehyde in edible fish and ascertain the safety level for market inspector to ensure people's diet safety.After more than two years of investigation and research,it is basically defined that the fresh(near sea shore) or frozen squids(Japan area,North Pacific Ocean,Peru area) contain the background content of formaldehyde.The contents of formaldehyde in different parts of the body are different.In the process of the squid products,the contents of formaldehyde in the squid products change to a certain extent.The squid products contain a certain amount of formaldehyde,and the contents of formaldehyde in the squid products change with storage time.First,the comparison and verification with the acetylacetonate method and the high performance liquid chromatography(HPLC) method are completed.Two kinds of methods can be used in the determination of formaldehyde in aquatic products.But in the samples of formaldehyde content＜1 mg/kg,the HPLC method has high accuracy.Second,the formaldehyde contents of the background in 25 kinds of aquatic products have been determined.The formaldehyde values are between 32.18 -50.99 mg/kg in sea fishes,and between 12.25-36.25 mg/kg in crustaceans,and between 0.23-2.88 mg/kg in shellfishes,and between 0.44-10.31 mg/kg in mollusks. The formaldehyde contents of the 33 species of squid's products are determined between 0.01 - 148 mg/kg.Third,the survey on the formaldehyde content of squids with the areas(Zhoushan coastal,the Japanese Sea areas,the North Pacific areas,Peru areas) and the survey on the formaldehyde content of squids with the storage conditions have been completed. The formaldehyde contents of different origin squids are basically the same.The formaldehyde contents in different specifications squids are unchangeable.The formaldehyde contents of the ocean squids in -20℃refri gerator are unchangeable. In -20℃refrigerator within a month,the formaldehyde content of fresh squids increases with the extension of storage time,and after a month,the formaldehyde contents of squids hold the line.The formaldehyde content in different parts of squids are very different,offal＞carcass＞head.Fourth,the surveys on the formaldehyde contents of squid's products in each technical process have been completed.Preliminary discussion has been made on the mechanism of formaldehyde content change.The surveys on the formaldehyde content of squid's products in storage condition have been completed.The formaldehyde contents increase obviously after one month,and increase slowly with the extension of storage time later.