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Improved multivariate quantification of plastic particles in human blood using non-targeted pyrolysis GC-MS
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Scientists developed improved methods for measuring plastic particles in human blood, finding that standard techniques can produce significant errors, especially for PET plastic. The new multivariate approach reduced measurement errors by up to 38%, which is important because accurate blood measurements are essential for understanding how much microplastic exposure people actually face.
Accurate analytical methods are crucial to assess human exposure to micro- and nanoplastics (MNPs). Quantitative pyrolysis-gas chromatography coupled with mass spectrometry (Py-GC-MS) has recently been used for quantifying MNPs in human blood. However, pyrolysis introduces complex effects such as secondary reactions between matrix compounds and polymers. This work introduces a non-targeted and multivariate approach to improve the identification and quantification of polyethylene (PE), poly(vinyl chloride) (PVC) and polyethylene terephthalate (PET). After spiking of extracted blood samples, PARADISe was used for componentization and integration of 417 features detected with Py-GC-MS. Quantification based on multivariate calibration models demonstrated a superior performance when compared to univariate regression. Feature selection approaches were used to identify optimal feature subsets, which reduced quantification errors by 30 % for PE, 10 % for PVC and 38 % for PET. In addition, chemical insight into pyrolysis processes was obtained by studying the matrix effects (MEs) of blood. The pyrolysis of PE and PVC appeared to be minimally affected (MEs = 81-154 %), while PET exhibited complex interactions with the matrix (MEs = 40-9031 %), impacting its quantification accuracy. In conclusion, this research highlights the importance of accounting for secondary effects during pyrolysis and introduces a multivariate approach for more accurate and robust quantification of MNPs in blood.
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Researchers tested whether a common lab technique (pyrolysis-gas chromatography-mass spectrometry) can reliably measure nanoplastics in human blood. They found that realistic detection limits were up to 20 times higher than ideal conditions suggest, and certain common plastics like polyethylene produced false readings due to interference from blood components. The study concludes that better analytical methods are needed before we can accurately measure plastic levels in human blood.
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Scientists developed a more precise way to detect and measure tiny plastic particles (microplastics and even smaller nanoplastics) in blood and body tissues, then used it to confirm these particles are present in human blood, with a typical amount around 0.8 micrograms per milliliter. This matters because it gives researchers a more reliable tool to track how much plastic is building up in our bodies over time—an important first step before scientists can figure out what health effects, if any, this exposure might cause.
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