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Mono-ortho- and non-ortho-substituted polychlorinated biphenyls in human milk from Mohawk and control women: Effects of maternal factors and previous lactation

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Abstract

Fifty-four individual human milk samples from 50 mothers (20 Mohawks and 30 controls) were analyzed for four non-ortho- and eight mono-ortho-substituted polychlorinated biphenyls (PCBs). Mean total coplanar PCBs concentrations were 49 ng/g and 55 ng/g lipid for Mohawk and control women, respectively. A statistical evaluation of all analytical data reveals no significant difference of total coplanar PCB level between Mohawk and control women. The level of these contaminants is influenced by the age of the mother, number of breastfed children, and length of nursing period. Older women, primiparae, and cigarette smokers had higher levels of coplanar PCBs. In general, women had higher levels of coplanar PCBs in the first lactation and in the earlier samples of a given lactation, while levels declined both with duration of breast-feeding and with number of children nursed.

The contribution of individual non-ortho- and mono-ortho-substituted PCB congeners to the total calculated toxic equivalent values (ΣTEQ) was assessed for the breast milk samples. The levels of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in human milk of pooled specimens from Los Angeles, California and Binghamton, New York, widely separate cities in the United States (Schecteret al. 1989), were presented for reference purpose. The main contributions to the ΣTEQ were PCB congeners #118 (25.8 pg/g lipid), #126 (25 pg/g lipid), #105 (10.8 pg/g lipid), and #156 (7.4 pg/g lipid). Collectively, these compounds accounted for 70% of the ΣTEQ values. Based on the TEFs proposed by Safe (1990), the overall TEQs calculated for the monitored PCBs, were about five times those due to total PCDD/Fs.

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Authors and Affiliations

  1. Wadsworth Center for Laboratories and Research, New York State Department of Health, 12201-0509, Albany, New York, USA

    C. S. Hong, J. Xiao & B. Bush

  2. SUNY Research Foundation, State University of New York at Albany, 12222, Albany, New York, USA

    A. C. Casey

  3. Bureau of Environmental and Occupational Epidemiology, New York State Department of Health, 12205, Albany, New York, USA

    E. F. Fitzgerald & S. A. Hwang

Authors
  1. C. S. Hong

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  2. J. Xiao

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  3. A. C. Casey

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  4. B. Bush

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  5. E. F. Fitzgerald

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  6. S. A. Hwang

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Hong, C.S., Xiao, J., Casey, A.C.et al. Mono-ortho- and non-ortho-substituted polychlorinated biphenyls in human milk from Mohawk and control women: Effects of maternal factors and previous lactation.Arch. Environ. Contam. Toxicol.27, 431–437 (1994). https://doi.org/10.1007/BF00213183

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