Chemosphere. 2017 Apr 14;181:63-73. doi: 10.1016/j.chemosphere.2017.04.059. [Epub ahead of print]
- 1
- Department of Molecular Biosciences, University of California, Davis, CA, United States.
- 2
- Department of Population Health and Reproduction, University of California, Davis, CA, United States.
- 3
- Department
of Molecular Biosciences, University of California, Davis, CA, United
States. Electronic address: bpuschner@ucdavis.edu.
Abstract
It
has been previously been shown by our lab and others that persistent
organic pollutants, such as polychlorinated biphenyls (PCBs) and
polybrominated diphenyl ethers (PBDEs), are contaminants in milk
produced for human consumption. To further this research we determined
the concentration of 21 PCB and 14 PBDE congeners in livestock serum,
mainly bovine, across California. Congeners were extracted from serum
using solid phase extraction (SPE), cleaned up by silica cartridge and
quantified using gas chromatography-triple quadruple mass spectrometry.
We detected significant differences among species and the production
class of cattle (beef or dairy). The sum of all 21 PCB congeners (ΣPCBs)
in caprine and ovine sera had a mean value of 9.26 and 9.13 ng/mL,
respectively, compared to 3.98 ng/mL in bovine sera. The mean value for
the sum of all 14 PBDE congeners (ΣPBDEs) in caprine and ovine sera was
2.82 and 2.39 ng/mL, respectively, compared to 0.91 ng/mL in bovine
sera. Mean ΣPCBs in dairy cattle was 5.92 ng/mL compared to 2.70 ng/mL
in beef cattle. Mean ΣPBDEs in dairy cattle was 1.33 ng/mL compared to
0.70 ng/mL in beef cattle. There were no regional differences in the
ΣPCBs or ΣPBDEs in cattle distributed across California. These results
highlight the fact that livestock are still being exposed to these
pollutants yet little is known about where this exposure may be coming
from.
Copyright © 2017 Elsevier Ltd. All rights reserved.
KEYWORDS:
Bovine; Caprine; Ovine; PBDE; PCB; Serum
