title: Feather meal: a previously unrecognized route for reentry into the food supply of multiple pharmaceuticals and personal care products (PPCPs).
abstract: Antimicrobials used in poultry production have the potential to bioaccumulate in poultry feathers but available data are scarce. Following poultry slaughter, feathers are converted by rendering into feather meal and sold as fertilizer and animal feed, thereby providing a potential pathway for reentry of drugs into the human food supply. We analyzed feather meal (n = 12 samples) for 59 pharmaceuticals and personal care products (PPCPs) using EPA method 1694 employing liquid chromatography tandem mass spectrometry (LC/MS/MS). All samples tested positive and six classes of antimicrobials were detected, with a range of two to ten antimicrobials per sample. Caffeine and acetaminophen were detected in 10 of 12 samples. A number of PPCPs were determined to be heat labile during laboratory simulation of the rendering process. Growth of wild-type E. coli in MacConkey agar was inhibited by sterilized feather meal (p = 0.01) and by the antimicrobial enrofloxacin (p < 0.0001) at levels found in feather meal. Growth of a drug-resistant E. coli strain was not inhibited by sterilized feather meal or enrofloxacin. This is the first study to detect antimicrobial residues in feather meal. Initial results suggest that more studies are needed to better understand potential risks posed to consumers by drug residues in feather meal.
authors.affiliation: Johns Hopkins Center for a Livable Future, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, United States. dlove@jhsph.edu
authors.forename: D C
authors.initials: DC
authors.lastname: Love
authors.forename: R U
authors.initials: RU
authors.lastname: Halden
authors.forename: M F
authors.initials: MF
authors.lastname: Davis
authors.forename: K E
authors.initials: KE
authors.lastname: Nachman
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000032:analysis / Q000494:pharmacology; D003132:Commerce; D024881:Drug Resistance, Bacterial / Q000187:drug effects; D004784:Environmental Monitoring; D004926:Escherichia coli / Q000187:drug effects / Q000254:growth & development; D005241:Feathers / Q000737:chemistry*; D005523:Food Supply / Q000191:economics; D006795:Household Products / Q000032:analysis*; D006801:Humans; D008826:Microbial Sensitivity Tests; D004364:Pharmaceutical Preparations / Q000032:analysis*; D014481:United States; D014866:Waste Products / Q000032:analysis* / Q000191:economics
chemical_list: D000890:Anti-Infective Agents; D004364:Pharmaceutical Preparations; D014866:Waste Products