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Identification and Visualization of Polystyrene Microplastics/Nanoplastics in Flavored Yogurt by Raman Imaging
Xin Ling1,2, Jun Cheng1,2, Weirong Yao1,2
1State Key Laboratory of Food Science and Resources, School of Food Science and Technology, Jiangnan University, Wuxi 214026, China.
Toxics
|May 24, 2024
Summary
This study developed a Raman imaging method to detect and quantify small microplastics in food, like yogurt. The validated technique successfully identified common polymers and their sizes, paving the way for universal food microplastic analysis.
Area of Science:
- Food Science
- Analytical Chemistry
- Environmental Science
Background:
- Microplastic contamination in food is a growing concern, especially for smaller particles.
- Detecting small microplastics in complex food matrices is challenging due to instrumental and methodological limitations.
Purpose of the Study:
- To develop and validate a Raman imaging method for quantifying microplastics in food.
- To assess microplastic contamination in flavored yogurt.
- To establish a foundation for a universal microplastic quantification method in food.
Main Methods:
- Utilized Raman imaging for visualization and identification of synthesized polystyrene particles (400-2600 nm).
- Developed a quantitative model for polystyrene particle size and concentration (R²=0.9946).
- Established and validated procedures for microplastic extraction and recovery in spiked flavored yogurt.
Main Results:
- Successfully quantified polystyrene particle size and concentration with high accuracy.
- Determined microplastic extraction efficiency in flavored yogurt.
- Identified polystyrene, polypropylene, and polyethylene as common polymers in unspiked yogurt, with smallest polystyrene particles measuring 1-10 μm.
Conclusions:
- The developed Raman imaging method is feasible for microplastic quantification in food.
- The study provides critical insights into microplastic contamination in yogurt.
- This work lays the groundwork for a universal method to analyze microplastics in various food products.
