Kady Palmer, Eckerd College
I previously outlined the problem of perfluorinated chemicals (PFCs) in the environment and their unknown health effects. In order to gain this knowledge, it is essential to determine what types of PFCs are frequently used and the mechanisms by which an individual would be exposed to them. Here, we are measuring the presence or absence of 15 PFCs that are commonly associated with non-stick cookware, firefighting foam, and water-resistant materials.
This compiled list of PFCs is the basis of my research procedure. From here, I must learn how these compounds interact with biological components in organisms in order to understand their subsequent health effects. With that being said, the type of samples I am analyzing is a topic worth explaining. PFCs are known to be “proteinophilic” or, attracted to proteins in the bloodstream of organisms like humans and, in the case of my study, manatees. Therefore, I am using manatee plasma to test for the total individual burden of PFCs.
Fig 1. 69 collection tubes containing manatee plasma samples (left). Aliquots of 22 samples of manatee plasma for future studies (right). Photos taken by me!
With 69 different plasma samples, I am performing a series of procedures that allow me to extract the PFCs. After completing multiple chemical processes (methodology proposed by Reiner et al., 2012), I am left with a liquid (containing the PFCs), measuring no more than 1 mL to be placed into a small vial. From here the vials are inserted into a liquid chromatography tandem mass spectrometer (LC-MS/MS), a machine that reads each of the 15 unique chemical structures of the outlined PFCs of interest and determines their abundance in each vial. This system isolates the concentration of each perfluorinated chemical for every one of the 69 manatee samples.
The concentrations of these chemicals is the ultimate goal of my research study. This data will be compared to manatee location, morphometrics, body condition, sex, and more, in order to gain a better understanding of the overall PFC burden on these animals. These factors, or variables, may also provide insight into what may be influencing the burden intensity an individual may face. Once this knowledge is gathered, potential links to the health effects of PFC accumulation can be investigated in both manatees and humans.
I’d like to thank the National Science Foundation for funding this research opportunity and the College of Charleston’s Grice Marine Laboratory REU program for making this experience possible. A special thanks to the NIST team who has been teaching and supporting me throughout this process, specifically, Dr. Jessica Reiner, Jacqueline Bangma, and my mentor, Dr. John Bowden.
Note: These samples were collected as part of a health assessment of manatees by the USGS Sirenia Project. No manatees were harmed in the process of obtaining them.
Reiner, Jessica, Karen Phinney, and Jennifer Keller. “Determination of Perfluorinated Compounds in Human Plasma and Serum Standard Reference Materials Using Independent Analytical Methods.” Analytical & Bioanalytical Chemistry 401, no. 9 (January 15, 2012): 2899–2907. doi:10.1007/s00216-011-5380-x.z