SUMMARY
Organochlorine pesticide residues in 4 types of vegetable oils.
The present study had as objectives to identify and to quantify organochlorine pesticide residues (OCP) hexachlorobenzene (HCB), lindane, cis-chlordane, heptachlor, aldrín, dieldrín, endrín and o,p’-DDT in vegetable oils of corn, soybean, sunflower and mixtures of oils, sold in the city of Maracaibo, Venezuela. 30 samples of 4 types of vegetable oils of 10 commercial brands were analyzed. The extraction of OCP residues was done according to the Official Method of AOAC. A gas chromatograph with an electronic capture detector (GC-ECD) was used for identification and quantification of OCP residues and confirmation was done with a gas chromatograph coupled with a mass spectrometer (GC-MS). All the OCP residues investigated were detected in the analyzed samples. Aldrin (0.0088), lindane (0.0054) and o,p’-DDT (0.0035) were the OCP residues detected in higher concentrations (µg/g). The statistical analysis showed significant differences (P<0.05) for the concentration of OCP in the different types and commercial brands of vegetable oils. Lindane concentration in the corn oil (0.0125 µg/g), as well as cis-chlordane (0.0091 µg/g) and aldrín (0.0287 µg/g) in the soybean oil exceeded maximal residual limits (MRL) established by Food and Agriculture Organization of the United Nations/World Health Organization (FAO/WHO). In conclusion, it was detected a high incidence of OCP residues in vegetable oils analyzed.

Key words: Organochlorine pesticides, vegetable oils, gas chromatography.



Recibido: 17/10/2007
Aceptado: 14/11/2007

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