title: Penetration studies of propoxur and phoxim from eggshell into whole egg after experimental exposure and application in henhouses.
abstract: The penetration of propoxur and phoxim from eggshell into whole egg was investigated in vitro by spraying eggs directly and in vivo after application of the compounds in henhouses. Although mean concentrations of the compounds on eggshells were up to 23000 microg kg(-1), mean residue concentrations in whole eggs were far below the current maximum residue levels (50 microg kg(-1) for propoxur and 60 microg kg(-1) for phoxim). These results provide the first evidence that propoxur and phoxim do not penetrate from eggshell into whole egg under experimental and field conditions. Subsequently, residue carry-over after egg cracking in households and during a worst-case situation in an egg-cracking plant was investigated. However, when eggs were cracked manually, a negligible contamination of whole egg values occurred. If, in an automated process, eggshells accidentally come into close contact with whole egg, very high residue levels of propoxur and phoxim may be generated time dependently. These results suggest that eggshell contact with whole egg during egg cracking must be avoided to prevent pesticide carry-over.
authors.affiliation: Institute for Food Toxicology, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, D-30173 Hannover, Germany.
authors.forename: Sasithorn
authors.initials: S
authors.lastname: Limsuwan
authors.forename: Beate
authors.initials: B
authors.lastname: Priess
authors.forename: Natthasit
authors.initials: N
authors.lastname: Tansakul
authors.forename: Heinz
authors.initials: H
authors.lastname: Nau
authors.forename: Manfred
authors.initials: M
authors.lastname: Kietzmann
authors.forename: Gerd
authors.initials: G
authors.lastname: Hamscher
mesh_terms: D000818:Animals; D002645:Chickens; D004528:Egg Shell / Q000737:chemistry*; D004531:Eggs / Q000032:analysis*; D005260:Female; D005506:Food Contamination / Q000032:analysis*; D006799:Housing, Animal; D007306:Insecticides / Q000032:analysis*; D009946:Organothiophosphorus Compounds / Q000008:administration & dosage / Q000032:analysis*; D001074:Propoxur / Q000008:administration & dosage / Q000032:analysis*; D012680:Sensitivity and Specificity
chemical_list: D007306:Insecticides; D009946:Organothiophosphorus Compounds; C003135:phoxim; D001074:Propoxur