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The small intestine plays a crucial role in our digestive system, performing both mechanical and chemical digestion.
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Microplastics interactions and transformations during in vitro digestion with milk.

Gopinath Mummaleti1, Jiannan Feng1, Anand Mohan1

  • 1Department of Food Science and Technology, The University of Georgia, Athens, GA 30602, USA.

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Microplastics change significantly during digestion, especially with milk, forming protein aggregates. Leaching chemicals from these food contaminants pose potential health risks, necessitating further research and regulation.

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Area of Science:

  • Environmental Science
  • Food Science
  • Toxicology

Background:

  • Microplastic contamination in food is a growing concern.
  • Understanding microplastic behavior during digestion is crucial for assessing health risks.
  • Limited data exists on microplastic interactions with food components like milk during digestion.

Purpose of the Study:

  • To investigate microplastic transformations during in vitro digestion.
  • To examine microplastic interactions with milk components during simulated digestion.
  • To evaluate potential health risks associated with microplastic digestion and leaching.

Main Methods:

  • In vitro digestion models using simulated digestive fluids.
  • Studies conducted with and without the presence of milk.
  • Analysis of microplastic changes using Fourier-transform infrared spectroscopy (FTIR).

Main Results:

  • Microplastics showed significant changes in size, surface morphology, and chemical properties post-digestion.
  • Milk digestion led to a 15-25% increase in microplastic aggregation due to protein corona formation.
  • FTIR analysis confirmed structural changes (hydrolysis) and significant milk protein adsorption onto microplastics.
  • Chemicals and additives leached from microplastics into the digestive fluid.

Conclusions:

  • Microplastics undergo substantial alterations during digestion, influenced by food matrices like milk.
  • Protein corona formation enhances microplastic interaction potential within biological systems.
  • Leaching of microplastic-associated chemicals raises health concerns, demanding further investigation and regulatory action.