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Abstract

PHTHALATE RESIDUES IN PLASTIC PACKAGED MILK AND DAIRY PRODUCTS

Saad M. M.*, Ahmed M. B. And Sultan Y. Y.

ABSTRACT

This study aims to search for the organic lipophilic of phthalates in plastic packaged pasteurized milk and the dairy products of fermented milk "Rayeb" and Domuatti cheese, locally produced and marketed in Cairo of Egypt. A pre-validated method using GC-MS was applied to detect the residues of the 6 phthalate congeners commonly used as plasticizers in bottles and food containers manufacturing. Such plasticizers are intentionally added to enhance the technical and industrial properties of the plastic containers used in food industry. Data of spiked samples obtained from the applied method showed average recovery percentages of 90.8 ± 5.3 and a percentage of coefficients of variation equivalent to 4.41 ± 0.6, depending upon both phthalate congener and the concentration of spiked samples. The corresponding percentages of recovery average of Rayeb and Domuatti cheese were 91.0 ± 2.1 and 88.3 ± 1.8, respectively, while the percentages of coefficient of variation were 3.31 ± 0.1 and 3.85 ± 0.9, respectively. However, data revealed that none of the 6 phthalates of DMP, DEP, DBP, BBP, DEHP and DOP were observed in any sample of milk, Rayeb and Domuatti cheese samples examined during the first month of production in both bottle and container sizes. As well, none of the 4 phthalates of DMP, DEP, DBP and/ or BBP were found in the 3 studied products up to the last month of expiry. Only 2 and 3, each out of 24 and 2 out of 18 samples of milk, Rayeb and Domuatti cheese, respectively showed low levels of contamination with DEHP or DOP. The determined residues of DEHP or DOP phthalates were ranged between 30-88/ng/ml. Moreover, the effect of the variables of 6 phthalate congeners, different brands, different container sizes and the storage time were discussed in this work.

Keywords: Phthalate congeners – lipophilic – fermented milk


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