Isomeric composition of tetracycline antibiotics in liquid manure at a swine animal feeding operation in iowa
Isomeric Composition of Tetracycline Antibiotics in Liquid Manure at a Swine Animal Feeding Operation in Iowa
M. T. Meyer, Ed Lee, U.S. Geological Survey, 4821 Quail Crest Pl., Lawrence, KS 66049
D.W. Kolpin, Kent Beecher, U.S. Geological Survey, 400 S. Clinton St., Iowa City, IA 52244
Abstract
Analytical methods used for environmental assessments of tetracycline antibiotics may redistribute the proportion of the parent antibiotics and their epimers and isomers in liquid waste and water. In previous studies, chlortetracycline and tetracycline have been reported as the sum of the parent compounds and their epimers and isomers. In order to determine concentrations of parent compounds, epimers, and isomers individually, on-line solid-phase extraction and liquid chromatography/mass spectrometry with standard addition was used to characterize liquid waste samples collected from swine lagoons. Antibiotic residues were measured in liquid waste collected from the north and south sides of a lagoon in July, October, and November 2003 at a swine animal feeding operation in Iowa. The lagoon was drained between the October and November samplings. Addressed The primary antibiotic detected was chlorotetracycline and the dominant isomeric species of chlorotetracycline found were iso-chlorotetracycline, iso-epi-chlorotetracycline, and epi-chlorotetracycline. The concentrations ranged from 1,200 µg/L to 4,600 µg/L for iso-chlorotetracycline, 1,100 µg/L to 2,700 µg/L for iso-epi- chlorotetracycline, and<0.1 to 92 µg/L for epi-chlorotetracycline. Chlorotetracycline was detected in three of six samples at concentrations from <0.1 to 1,400 µg/L. Tetracycline and epi-tetracycline were detected in all the samples at concentrations from 71 to 210 µg/L. Anhydro-tetracycline, a degradate of tetracycline, was detected at concentrations of <0.1 to 2.4 µg/L. Lincomycin was detected in concentrations from 0.9 to 44 µg/L. Spatial and temporal variations in concentrations were measured and will be discussed. More importantly, to understand the environmental distribution and fate of the tetracycline antibiotics and the relation between antibiotic residues and antibiotic-resistant bacteria, the isomeric species as well as the parent antibiotic need to be measured. Biographical Sketches Michael T. Meyer, PhD., U.S. Geological Survey Michael Meyer has been a Research Geochemist for the U.S. Geological Survey (USGS) since 1988. He received his Ph.D. in Geology from the University of Kansas in 1994. His research has focused on the development of methods for the analysis of emerging organic contaminants (e.g. herbicide metabolites and pharmaceuticals) and determining their occurrence, fate, and geochemical transport in the environment. Currently he is Director of the USGS, Kansas District, Organic Geochemistry Research Laboratory. Dana Kolpin is a research hydrologist and has worked for the USGS since 1984. His research interests include the occurrence of pesticides, pharmaceuticals, and other emerging contaminants in the environment.
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