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Background Fast food consumption is associated with biomarkers of ortho-phthalates exposures. However, the chemical content of fast food is unknown; certain ortho-phthalates (i.e., di- n -butyl phthalate (DnBP) and di(2-ethylhexyl) phthalate (DEHP)) have been phased out and replaced with other plasticizers (e.g., dioctyl terephthalate (DEHT)). Objective We conducted a preliminary study to examine ortho-phthalate and replacement plasticizer concentrations in foods and food handling gloves from U.S. fast food restaurants. Methods We obtained hamburgers, fries, chicken nuggets, chicken burritos, cheese pizza ( n  = 64 food samples) and gloves ( n  = 3) from restaurants and analyzed them for 11 chemicals using gas chromatography mass spectrometry. Results We found DEHT at the highest concentrations in both foods ( n  = 19; median = 2510 µg/kg; max = 12,400 µg/kg) and gloves ( n  = 3; range: 28–37% by weight). We detected DnBP and DEHP in 81% and 70% of food samples, respectively. Median DEHT concentrations were significantly higher in burritos than hamburgers (6000 µg/kg vs. 2200 µg/kg;  p  &lt; 0.0001); DEHT was not detected in fries. Cheese pizza had the lowest levels of most chemicals. Significance To our knowledge, these are the first measurements of DEHT in food. Our preliminary findings suggest that ortho-phthalates remain ubiquitous and replacement plasticizers may be abundant in fast food meals. Impact statement A selection of popular fast food items sampled in this study contain detectable levels of replacement plasticizers and concerning ortho-phthalates. In addition, food handling gloves contain replacement plasticizers, which may be a source of food contamination. These results, if confirmed, may inform individual and regulatory exposure reduction strategies.

Phthalate and novel plasticizer concentrations in food items from U.S. fast food chains: a preliminary analysis