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Analytical Methods for Microplastic Detection in Hepatic and Gastrointestinal Human Tissues: A Review and Methodological Framework
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Scientists have found tiny plastic particles (microplastics) in human liver and gut tissue, but this review shows that different labs use very different methods to detect them, making it hard to compare results or know how much plastic is really in our bodies. The researchers didn't discover new health risks, instead, they're calling for standardized testing methods so future studies can give us clearer, more reliable answers about how microplastics affect our health.
Microplastics (MPs) and nanoplastics (NPs) accumulate in human hepatic and gastrointestinal (GI) tissues. However, differences in sampling strategies, tissue preparation, analytical techniques, and quality assurance procedures have resulted in substantial methodological heterogeneity, limiting the comparability and reproducibility of published findings. Therefore, this review aims to critically evaluate current analytical methodologies for the detection and characterization of MPs and NPs in hepatic and GI tissues, highlight methodological strengths, limitations, and emerging technologies, and identify priorities for methodological standardization. Studies demonstrate that no single analytical technique can simultaneously provide comprehensive information on particle size, morphology, polymer composition, spatial localization, and concentration. While Raman spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, pyrolysis gas chromatography–mass spectrometry (Py-GC/MS), and emerging multimodal imaging techniques each offer distinct advantages, reflecting their different underlying detection principles, methodological variability remains a major barrier to cross-study comparison. Human tissue studies are further constrained by limited sample availability, contamination risks, and inconsistent quality assurance procedures. Future progress will depend on harmonized, organ-specific analytical workflows integrating optimized tissue digestion, rigorous contamination control, complementary spectroscopic approaches, and standardized reporting metrics. Establishing unified methodological guidelines is essential to improve reproducibility, facilitate quantitative evidence synthesis, and advance both environmental exposure assessment and clinical research on MPs and NPs in hepatic and gastrointestinal tissues.
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Scientists have found tiny plastic particles in human blood, lungs, and even placentas, but this review of 218 studies reveals a problem: the tools researchers use to detect microplastics aren't consistently reliable, and many studies skip basic quality checks that would confirm their results are accurate. This matters because until testing methods are standardized, it's hard to know exactly how much plastic is really in our bodies or what health risks it poses, the researchers call for stricter, more consistent lab practices to get trustworthy answers.
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