The fluid that surrounds a baby during pregnancy does more than cushion and protect. Amniotic fluid reflects what a developing fetus is exposed to in the womb, offering a direct snapshot of both fetal metabolic processes and the prenatal environment. Yet despite its importance, scientists have rarely studied it for environmental chemicals.
In our new study, we used an advanced detection method called non-targeted analysis to examine amniotic fluid samples from 40 pregnancies in the San Francisco Bay Area. Unlike traditional approaches that look for a limited set of chemicals, non-targeted analysis casts a much wider net, allowing researchers to detect both known chemicals and previously undetected compounds.
We detected thousands of molecules in amniotic fluid, many of which may represent previously unrecognized chemicals. We confirmed ten environmental contaminants, nine of which had never been reported in amniotic fluid.
These chemicals came from everyday sources: surfactants used in shampoos and cleaning products, plasticizers added to make materials more flexible, and industrial compounds involved in manufacturing dyes, rubber, and pharmaceuticals. One compound, quinoline, is classified by the U.S. Environmental Protection Agency as a possible human carcinogen.
These are not rare or unusual substances. They are chemicals that we encounter regularly through food packaging, textiles, household products, and personal care items. The fact that they were detected in the fluid surrounding a developing fetus raises important questions about what these exposures may mean for fetal health.
We also found early signs that some of these contaminants may be interacting with the body’s natural chemistry. Several chemicals, including a compound linked to tire rubber and another related to plastics manufacturing, were associated with lipid metabolites involved in fat metabolism, an essential process for fetal growth and organ development.
This study is a first step toward understanding the prenatal chemical environment. While the study cannot determine whether these chemical levels cause harm, the findings suggest that the prenatal environment is more chemically complex than previously recognized and that amniotic fluid deserves much closer attention in future research.
Authors: Xiaowen Ji, Phd; Matthew Shear, MD; Dimitri Abrahamsson, PhD, MS; Julian Edwards; Miaomiao Wang, PhD; Joshua F. Robinson, PhD; June-Soo Park, PhD, MS
About the author
Xiaowen Ji, PhD, is a Scientist I at the Public Health Institute, where he develops methods to detect previously unknown or underrecognized chemicals people may encounter through their environment and diet, and studies how those chemicals may interact with the body’s metabolic processes. He completed his postdoctoral training at NYU Grossman School of Medicine and received his PhD from the University of Saskatchewan in Canada.
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