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Unraveling microplastic behavior in simulated digestion: Methods, insights, and standardization
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This review evaluates 85 studies that used simulated digestion experiments to understand what happens to microplastics in the human gut. The authors found that methods vary widely between studies, making it hard to compare results and draw reliable conclusions about how microplastics behave during digestion. Standardized testing methods are needed to accurately assess whether and how microplastics release harmful chemicals or change form as they pass through the human digestive system.
Despite the rapid expansion of in vitro digestion studies on microplastics (MPs), the field remains fragmented due to inconsistent methodologies, varying analytical approaches, and a lack of standardized protocols. These discrepancies hinder cross-study comparisons, complicate risk assessments, and limit the applicability of in vitro models for understanding MP fate and pollutant interactions in the gastrointestinal environment. A comprehensive synthesis is needed to assess progress, identify research gaps, and establish a unified research direction. This review systematically evaluates 85 studies (2020-2024), consolidating key findings and methodological challenges. It examines disparities in digestion protocols, fluid compositions, and exposure conditions, assessing how factors such as pH, enzyme activity, residence time, and temperature shape MPs' behavior and physicochemical transformations. Key findings on bio-corona formation, structural modifications, contaminant bioaccessibility, and interactions with digestive enzymes are synthesized to provide a clearer picture of MP behavior during digestion. With the field remains dominated by studies on polystyrene and polyethylene MPs in human-based models, inconsistencies persist, highlighting the urgent need for standardized methodologies. By addressing these gaps, this review lays a critical foundation for improving reproducibility, advancing standardization efforts, and strengthening exposure assessments, ultimately enhancing our understanding of MP ingestion risks to human health.
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This review explores how microplastics travel through the human digestive system and what effects they may have on gut health. Researchers found that microplastics can carry harmful hitchhikers like heavy metals, antibiotics, and bacteria, potentially disrupting the gut microbiome and intestinal barrier. The study emphasizes the urgent need to develop better laboratory gut models to accurately simulate how microplastics interact with human digestive physiology.
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Researchers used complementary in vitro gut models to study how microplastics behave during human digestion, finding that digestive conditions alter microplastic surface properties and their interactions with gut cells. The work advances understanding of how ingested microplastics may affect the human digestive system.
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This study used laboratory models of the human digestive system to track what happens to microplastics as they pass through the gut, and how they interact with gut bacteria and the mucus lining. The findings provide insight into how microplastics may disrupt the gut environment and potentially affect human health.
In vitro digestion of microplastics in human digestive system: Insights into particle morphological changes and chemical leaching
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Researchers simulated human digestion on four common types of microplastics and found that stomach acid and digestive enzymes changed the particles' shape, surface texture, and caused them to release chemical additives. The study shows that microplastics are not inert once swallowed -- they are actively transformed in the gut, which could increase their ability to interact with intestinal tissues and release potentially harmful chemicals.
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Researchers simulated human digestion to study how micro-, submicro-, and nanoplastics change as they pass through the stomach and intestines. They found that the digestive process altered the surface properties and size distribution of the plastic particles, potentially affecting how they interact with intestinal cells. The study suggests that the body's digestive environment may transform plastic particles in ways that influence their biological impact.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.