| Endocrine Disrupting Chemicals (EDCs) have attached worldwide attention because of its widespread presence in nature and human living environment, and its harm to human body organs, especially the reproductive system. The extensive use of plastic in the production and life makes the migration of EDCs to packaged food become the focus of national research. So looking for suitable experimental methods of EDCs extraction, detection and migration is particularly significant. This paper studied extraction and detection methods of nine EDCs which were plasticizers, antioxidants and photoinitiators in four plastic samples, analyzed the effect of different extraction factors in the extraction process, and carried out a comparative analysis between composition and content of EDCs and regulations. Meanwhile based on the rapid development of microwave heating in daily life, this study analyzed the regularity and affecting factors of EDCs migration under microwave heating. The results showed as follow:EDCs extraction from plastic is used ultrasonic extraction and GC-MS technologies. The extraction process is influenced by type of solvent, extraction time, solvent dosage, temperature and ultrasonic power. The selection of extraction solvent is based on experiments and the principle that the similar substance is more likely to be dissolved by each other. Extraction effects are increased with the growth of extraction time, temperature and solvent dosage, but it will no longer increase when the factors to a certain degree. Extraction power is the ultrasonic intensity that the material received per unit area, and it can make the extraction effects rise if it increases; however, once the power is too large, EDCs structure will be destroyed. The extraction of nine kinds of endocrine disruptors can achieve the best effect with the single ultrasonic extraction conditions of20ml of acetone solvent,60℃,20min under280W.The average recovery of the detected EDCs is between85%～101%and the relative standard deviation is between3%～6%with the analysis methods of ultrasonic extraction-GC/MS. The nine EDCs are detected except DEHA in four samples, and they are distributed in the resin and the ink. That means they are commonly used additives, which play roles in resin molding and ink printing. It can be seen that the content of EDCs is not excessive through comparing the test results with the relevant provisions of GB9685-2008and EU10-2011.Due to the special principle of microwave heating, migration under microwave heating differs from the traditional heating. Migration is mainly affected by microwave power, heating time, EDCs molecular structure, food simulants and other factors. Nine kinds of EDCs in addition to DEA and BHA can migrate to food simulants, and migration rates increase with the increasing microwave energy the migration cell received. EDCs which have small molecular weight and simple structure will have large migration rate. The type of food simulants(three kinds of edible oil-olive oil, peanut oil and corn oil) has little effect on migration rate. EDCs migration continues when plastic sample still contacts with food stimulant in the cooling process after microwave heating. The initial rapid rise in EDCs migration is followed by a levelling off with time with each EDCs. |
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