Comparison of matrix-solid phase dispersion and liquid-liquid extraction for the chromatographic determination of fenthion and its metabolites in olives and olive oils

Sara Cunha (1)

1 Food Science

A matrix-solid phase dispersion (MSPD) methodology has been developed to extract fenthion and its metabolites from olives and olive oils and compared with a conventional liquid-liquid extraction (LLE) procedure. The pesticide residues were analyzed by gas chromatography using a nitrogen-phosphorus detector. Both extraction methods gave linear response at least over the concentration range assayed (0.03-1 mg/kg for MSPD and 0.1-1 mg/kg for LLE). Recoveries and RSD (n=6) values in olives were 85-112% and 2-6% for MSPD and 68-108% and 4-16% for LLE, respectively. In the case of olive oil the recoveries and RSD (n=6) values were 67-98% and 5-11% for MSPD and 63-115% and 6-14% for LLE, respectively. When compared to the LLE the developed MSPD method gave at least two times more sensitivity and required ten times less quantity of sample. The proposed method was applied in olives and olives oil samples obtained from olives groves treated with fenthion.

Mots clés: Life Sciences

Sara Cunha. Comparison of matrix-solid phase dispersion and liquid-liquid extraction for the chromatographic determination of fenthion and its metabolites in olives and olive oils. Food Additives and Contaminants, 2007, 24 (02), pp.156-164. ⟨10.1080/02652030600970374⟩. ⟨hal-00577371⟩