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RISK ASSESSMENT OF INGESTING POLYUNSATURATED FATTY ACIDS AND ORGANOCHLORINE PESTICIDE RESIDUES IN FIVE SEAWEEDS FROM JIAOZHOU BAY

PENG Quan-Cai;SONG Jin-Ming;LI Chen;YU Li-Dong;Institute of Oceanolog Chinese Academy of Science;  
Seaweed is often rich in polyunsaturated fatty acids(PUFAs) but sometimes contains a certain amount of organochlorine pesticides(OCPs) from a polluted environment. Risk assessment on the seaweed in this regard is important in food safety. Five economic seaweed: Porphyra yezoensis Veda, Porphyra haitanensis Chang et Zheng, Laminaria japonica Aresch, Undaria pinnatifida Sur., and Gracilaria lemaneiformis were collected from Jiaozhou Bay, China. Their OCPs and fatty acids were analyzed. Results show that palmitic acid, oleic acid, linoleic acid, arachidonic acid, and docosahexaenoic acid were the predominant fatty acids in these seaweed species, and the ratio of n-6/n-3 PUFA are is well above 4 that recommended, indicating high nutrition in the five seaweeds. The main residue of OCPs in the seaweed species were γ-HCH, P,P'-DDD, and P,P'-DDT. The risk assessment of co-ingestion of the OCPs and active EPA+DHA from PUFAs showed that co-ingestion of the OCPs and active EPA+DHA from PUFAs of the seaweed species would not result in a health risk of cancer when daily taking a minimum amount of EPA+DHA for a healthy adult via the consumption of the seaweeds.
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