Dissertation > Industrial Technology > Light industry,handicrafts > Food Industry > General issues > Food Packaging

Migration Analysis of Compounds from Food Packaging Material

Author SunBinQing
Tutor WangZhiWei
School Jiangnan University
Course Packaging Engineering
Keywords Migration Model Diffusion coefficient Partition Coefficient Migration assay Food Packaging PET
Type Master's thesis
Year 2006
Downloads 940
Quotes 12
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With the rapid development of materials science , polymer materials to different forms more and more widely used in food packaging . However, due to the polymer characteristics of the material itself and its modified processing , resulting in the formation of low molecular weight compounds , giving food safety hidden trouble , but also endanger people's health . To solve this problem , before the selection of materials , we must analyze the migration of the polymer material of low molecular weight compounds , to consider the impact of the migration process of the packaging materials used . In this paper, migration mathematical model and the impact on the migration of the important parameters of the model - the diffusion and distribution coefficients , while taking advantage of the existing experimental conditions , determination of PET bottle grade material compound ( chlorobenzene and phenol) migration over time , and then The experimental data and the existing migration mathematical model analysis and comparison . This paper analyzes and compares the existing single and double migration model , and discussed the food solution to swell the constraints of the boundary layer and food viscous non-ideal factors on the impact of the migration process . Diffusion and distribution coefficients have a major impact on the migration model , semi-empirical formula of the diffusion coefficient and free volume formula , and the allocation coefficient of regular solution theory model and group contribution model . Experimental part , chlorobenzene and phenol as a PET bottle used on the market containing a trace amount , so this experiment the high concentration soaking method to enlarge the measured concentration of the compound . In order to ensure good analysis of the migration assay sensitivity needs , also called polymer matrix does not change the characteristics of this experiment, the concentration of 2000ppm as the target measured values ​​. Were chosen in order to simulate the food environment of use of PET bottles , four n-hexane , 3% acetic acid , 15% ethanol and distilled water as the food simulant . Soaking a sample of the four solutions take a different time , with a gas chromatographic determination of chlorobenzene and the amount of migration of the phenol , using the internal standard method (internal standard for quantitative analysis pentadecane ) . After analysis, the experimental data in line with the the Fick dynamics .

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