title: Determination of total 14C residues of sarafloxacin in eggs of laying hens.
abstract: [14C]sarafloxacin was orally administered to six laying hens for five consecutive days. Eggs were collected for 15 days after the initial drug treatment. Egg yolk and egg albumen were separated and assayed for total radioactive residues (TRR) using a combustion oxidizer and scintillation counting techniques. Radioactivity was detected in egg yolk and egg albumen on the second day of dosing and reached a maximum at 24 h after drug withdrawal. Thereafter, the sarafloxacin TRR levels in egg albumen declined rapidly and were undetectable 2 days after the last dose, whereas the levels in egg yolk declined at a much slower rate and were undetectable 7 days after drug withdrawal. In both the egg albumen and yolk, HPLC analysis indicated that the parent sarafloxacin was the major component.
authors.affiliation: Center for Veterinary Medicine, U.S. Food and Drug Administration, 8401 Muirkirk Road, Laurel, Maryland 20708, USA. pchu@cmv.fda.gov
authors.forename: P S
authors.initials: PS
authors.lastname: Chu
authors.forename: D J
authors.initials: DJ
authors.lastname: Donoghue
authors.forename: B
authors.initials: B
authors.lastname: Shaikh
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D002247:Carbon Isotopes; D002645:Chickens / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D002939:Ciprofloxacin / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000493:pharmacokinetics*; D004350:Drug Residues / Q000378:metabolism; D004527:Egg Proteins / Q000032:analysis*; D004530:Egg Yolk / Q000737:chemistry*; D005260:Female; D024841:Fluoroquinolones
chemical_list: D000890:Anti-Infective Agents; D002247:Carbon Isotopes; D004527:Egg Proteins; D024841:Fluoroquinolones; D002939:Ciprofloxacin; C047224:sarafloxacin