Objective: To study and analyze the release of microplastics from common self heating convenience food packaging materials. Method: Experimental instruments such as confocal laser microscopy, scanning electron microscopy, and infrared Raman spectroscopy are used to detect the release of microplastic particles from common self heating instant food packaging materials during heating. Microplastic particle counting is performed using a cell counting plate. After heating, several types of self heating convenience food packaging materials released a large amount of microplastics, ranging from 1.94 × 109 to 7.49 × 109 particles/mL, with an average release of 4.21 × 109 particles/mL, including micro - and nano level plastics. The packaging materials of different brands of convenience foods vary in weight, size, and material, resulting in differences in the number of microplastic particles released. The shapes are spherical, short rod-shaped, strip-shaped, flaky, and irregular shapes, with polypropylene (PP) being the main material. Conclusion: Self heating convenience food packaging materials release a large amount of microplastics during heating, posing a significant risk to human health. The research results can provide theoretical basis and technical reference for the detection and risk assessment of microplastics in food packaging in the future. |