Department of Obstetrics, Gynecology and Reproductive Sciences, Program on Reproductive Health and the Environment, University of California San Francisco, San Francisco 94143, California, United States.
Department of Toxic Substances Control, Environmental Chemistry Laboratory, California Environmental Protection Agency, Berkeley 94710, California, United States.
Environ Sci Technol. 2021 Aug 3;55(15):10542-10557. doi: 10.1021/acs.est.1c01010. Epub 2021 Jul 14.
Recent technological advances in mass spectrometry have enabled us to screen biological samples for a very broad spectrum of chemical compounds allowing us to more comprehensively characterize the human exposome in critical periods of development. The goal of this study was three-fold: (1) to analyze 590 matched maternal and cord blood samples (total 295 pairs) using non-targeted analysis (NTA); (2) to examine the differences in chemical abundance between maternal and cord blood samples; and (3) to examine the associations between exogenous chemicals and endogenous metabolites. We analyzed all samples with high-resolution mass spectrometry using liquid chromatography-quadrupole time-of-flight mass spectrometry (LC-QTOF/MS) in both positive and negative electrospray ionization modes (ESI+ and ESI-) and in soft ionization (MS) and fragmentation (MS/MS) modes for prioritized features. We confirmed 19 unique compounds with analytical standards, we tentatively identified 73 compounds with MS/MS spectra matching, and we annotated 98 compounds using an annotation algorithm. We observed 103 significant associations in maternal and 128 in cord samples between compounds annotated as endogenous and compounds annotated as exogenous. An example of these relationships was an association between three poly and perfluoroalkyl substances (PFASs) and endogenous fatty acids in both the maternal and cord samples indicating potential interactions between PFASs and fatty acid regulating proteins.
近年来，质谱技术的进步使我们能够对生物样本进行广泛的化合物筛选，从而更全面地描述人类在发育关键期的暴露组。本研究的目的有三：（1）使用非靶向分析（NTA）分析 590 对匹配的母血和脐血样本（共 295 对）；（2）检验母血和脐血样本中化学物质丰度的差异；（3）研究外源性化学物质与内源性代谢物之间的关联。我们使用液相色谱-四极杆飞行时间质谱（LC-QTOF/MS）对所有样本进行高分辨率质谱分析，采用正、负离子电喷雾电离模式（ESI+ 和 ESI-）以及软电离（MS）和碎裂（MS/MS）模式对优先特征进行分析。我们通过分析标准品确认了 19 种独特化合物，通过 MS/MS 谱匹配暂定鉴定了 73 种化合物，通过注释算法注释了 98 种化合物。我们观察到 103 种母血样本中内源性化合物与外源性化合物之间存在显著关联，128 种脐血样本中存在这种关联。这些关系的一个例子是母血和脐血样本中三种多氟和全氟烷基物质（PFAS）与内源性脂肪酸之间的关联，表明 PFAS 与脂肪酸调节蛋白之间可能存在相互作用。
