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Evaluation of Analytical Methods for Determining Pesticides in Baby Food

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Abstract: Three extraction methods and two detection techniques for determining pesticides in baby food were evaluated. The extraction techniques examined were supercritical fluid extraction (SFE), enhanced solvent extraction (ESE), and solid phase extraction (SPE). The detection techniques used were enzyme-linked immunosorbent assay (ELISA) and gas chromatography/mass spectrometry (GC/MS). Different SFE and ESE conditions were considered, and the resulting extracts were analyzed by either ELISA or GC/MS. The use of C18 SPE cartridges to extract pesticides from baby food were also evaluated.
Using SFE-ELISA, recoveries of most spiked pesticides were less than 50% in both non-fat and fatty baby food. Using SFE-GC/MS, recoveries of target pesticides were greater than 80% in dried baby food, but 10-60% of the spiked pesticides were lost during the freeze-drying process. Off-line coupling of SPE-GC/MS provided a quantitative measure (>80%) of the pesticides in non-fat baby food (fruits and vegetables). Direct ELISA applied to diluted non-fat food also gave a quantitative measure of the target pesticides. The ESE-ELISA method provided a quantitative determination of atrazine in both non-fat and fatty baby food.

This work was supported by US EPA Contract No. 68-D4-0023 to Battelle Memorial Institute. It has been subjected to the Agency's peer and administrative review and has been approved for publication as an EPA document. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
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Citation:Chuang, J. C., M. A. Pollard, M. Misita, and J. M. Van Emon. Evaluation of Analytical Methods for Determining Pesticides in Baby Food. ANALYTICA CHIMICA ACTA 399(1-2):135-142, (1999).
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Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
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Division: Human Exposure & Atmospheric Sciences Division
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Branch: Human Expsoure Research Branch
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Product Type: Journal
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Published: 11/01/1999
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Related Entries:
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Bullet Item Human Exposure Measurements/Methods: Develop and Test Immunochemical and Other Screening Techniques for Use in Exposure Monitoring
spacer Relationship Reason:   A Project of the Product
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Last Updated on Monday, October 22, 2007
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