Objective:

To chemically identify microplastics within intestinal epithelial cells and assess their cellular effects without the use of labels or dyes.

Key Findings:

• Microplastics as small as ~1 µm were identified within cells using O-PTIR.
• Spectral features indicated oxidative stress and lipid peroxidation in exposed cells.
• Changes in amide I and II bands suggested alterations in protein folding and aggregation.

Interpretation:

The study demonstrates a novel method for detecting and analyzing the effects of microplastics at a cellular level, highlighting the potential for significant biological impacts.

Limitations:

• The study was conducted in vitro, limiting the applicability of findings to real biological systems.
• Further research is needed to extend findings beyond cell cultures.

Conclusion:

The integration of O-PTIR for simultaneous detection and biochemical analysis of microplastics presents a significant advancement in understanding their cellular interactions.