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INFLUENCE OF FAT AND MOISTURE CONTENT ON FOODS ON TRANSFER OF PESTICIDES
MELNYK, L. J., T. E. HIEBER, AND C. E. BERNARD. INFLUENCE OF FAT AND MOISTURE CONTENT ON FOODS ON TRANSFER OF PESTICIDES. Presented at European Pesticide Residue Workshop , Corfu, GREECE, May 21 - 25, 2006.
The overall goal of this research program is to identify those chemicals, pathways, and activities that represent the highest potential exposures to children and to determine the factors that influence these exposures. The following objectives will address this goal:
Revise and refine the existing research plan for children's exposure measurements research.
Collect measurement data on children's exposures.
Provide analytical support to children's pesticide exposure research.
Develop analytical methods for pesticides in duplicate diet food samples.
Develop and apply analytical methods for other chemicals including but not limited to brominated diphenyl ethers, phthalates, perfluorinated chemicals.
Evaluate the impact of chiral chemistry on the risk to children and exposure assessment.
Provide support to the National Children's Study.
Perform data analyses to fill critical data gaps.
Conduct analyses of dietary samples and refine the dietary model for the dietary exposure algorithm.
Tranfer efficiencies (%) of eight pesticides from a Formica surface to 13 different foods were measured to estimate dietary exposure potential from contacts prior to consumption. the foods were categorized into four groups: 1) high fat, high moisture; 2) low fat, high moisture; 3) high fat, low moisutre; and 4) low fat, low moisture to determine if these characterizations affected transfer. Fat content was calculated from nutritional information on the packaging. A moisture analyzer was used to thermogravimetrically measure water content of each food item. Surface loading was determined by wiping with isopropanol-moistened gauze pads.
The average transfer efficiencies were 75.1, 75.9, 4.7 and 7.3% for categories 1, 2, 3 and 4,respectively (see above). Analysis of variance and a Tukey multiple comparison test were used to assess mean transfer efficiencies among the eight pesticides and identify significant differences between food groups. Significant differences in transfer efficiency among the food groupings only correlated to moisture content of the food.