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Rapid sample preparation to detect microplastics in baby milk powder
Summary
This study developed a rapid sample preparation method to detect microplastics in baby milk powder, addressing the absence of standardized procedures for food matrices. The method enables faster monitoring of microplastic contamination at a critical point of human dietary exposure, particularly for infants.
Microplastics, ubiquitous as it is, could be released into food during production chain, through packaging and by consumer´s use. To determinate human exposure to microplastics is crucial to monitor microplastics in food matrices. The current absence of standard sample preparation procedures to identify and quantify different microplastics according to number and mass have generate time-consuming protocols and lack of comparability among different analytical methods, laboratories and time scales. Monitoring microplastics in complex matrices as food, and in particular in baby milk powder, requires an accurate approach that need to be validate, to ensure the comparability of results. Bottled drinking water or surface waters, for example, can be measured with mass-based methods (TED-GC/MS or Py-GC/MS) directly after filtration. Baby milk powder, instead is more challenging, due to the proteins and fatty acid that clog the filters and contaminate the measuring devices with heavy carry over. In this study, we characterize the baby milk powder by thermogravimetric analysis (TGA) and we tested different treatments for matrix reduction: water, H2O2, citric acids. In particular, the use of citric acid was tested for protein reduction before filtration. Our hypothesis was that citric acid will induce the precipitation of proteins and amino acids, leading to a strong matrix reduction. In fact, this sample pre‑treatment, allowed us to use a higher intake, necessary for representative quantification. Finally, the milk powder was spiked with reference material tablets containing polyethylene terephthalate (PET). The PET was not degraded by the citric acid and high recovery rate was achieved by TED-GC/MS and Py-GC/MS methods. Considering the simplicity and accessibility of this sample preparation and its robust results, this procedure could be easily proposed as a simple sample preparation approach to monitor microplastics by mass-based methods. Also see: https://micro2024.sciencesconf.org/558944/document
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